© The Authors, 2025, Published by the Universidad del Zulia*Corresponding author: jechavarria@pucesm.edu.ec
Keywords:
Water restriction
Cutting grass
Physiological variables
Controlled decit irrigation on growth variables of Pennisetum purpureum x Pennisetum
typhoides
Pennisetum purpureum x Pennisetum
typhoides
Pennisetum purpureum x Pennisetum
typhoides

1
Rosa Razz García
2
Jorge Vilchez-Perozo
3
Rev. Fac. Agron. (LUZ). 2025, 42(3): e254230
ISSN 2477-9407
DOI: https://doi.org/10.47280/RevFacAgron(LUZ).v42.n3.I
Crop production
Associate editor: Dr. Juan Vergara-López

Bolivarian Republic of Venezuela

Ecuador.
     
     
Bolivariana de Venezuela. AP 15205.
     
     
Bolivariana de Venezuela. AP 15205.
Received: 06-02-2025
Accepted: 02-06-2025
Published: 22-06-2025
Abstract



      Pennisetum purpureum
x Pennisetum typhoides       
   
80, and 100 % of the crop evapotranspiration (ETc). The grass



       






2
.d)
-1
, TCR is -0.00022 g.g.d
-1
,
    
2
.d)
-1
     

           

This scientic publication in digital format is a continuation of the Printed Review: Legal Deposit pp 196802ZU42, ISSN 0378-7818.
Rev. Fac. Agron. (LUZ). 2025, 42(3): e254230 July-September. ISSN 2477-9409.
2-6 |
Resumen
          
         

         
 Pennisetum purpureum x Pennisetum typhoides) en el

de riego al 40, 60, 80 y 100 % de la evapotranspiración del cultivo
     
          
        






 
2
.d)
-1
, TCR
-0,00022 g.g.d
-1
, TAN 0,0072065 
2
.d)
-1



80 % de su necesidad hídrica real y no verse afectado en las variables

Palabras clave: restricción hídrica, pasto de corte, variables

Resumo
 na agricultura
 técnicas que       

Pennisetum
purpureum x Pennisetum typhoides) no cantão de Chone, Equador. Os



     
         

         
 líquida da relva
(TAN),        



2
.d)
-1
, TCR -0,00022 g.g.d
-1
,
  
2
.d)
-1
        


hídrica real e 
Palavras-chave: restrição hídrica, corte de
 

Introduction
         
           

Pennisetum purpureum
x Pennisetum typhoides


et al., 2017
et al., 2020).
         


(López et al         
 
          
et al., 2021).

      

        
        
         
          
et al., 2023). Several studies conducted on species of agricultural

processes of plants (respiration, transpiration and photosynthesis)


         

          

Pennisetum purpureum x Pennisetum typhoides) in the
canton of Chone, Ecuador.
Materials and Methods
Location of the study
         
       

           

-1

      
-1
evaporation
        


-1
.
Purple King Grass establishment and management


2
(Blanco
et al


        
Spodoptera frugiperda reached the threshold
      
®
   

-1

       
et al., 2021). This activity
          

-1
. In

=
2 1
2 
log 2 log 1
2 1
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This scientic publication in digital format is a continuation of the Printed Review: Legal Deposit pp 196802ZU42, ISSN 0378-7818.
Chavarría et al. Rev. Fac. Agron. (LUZ). 2025, 42(3): e254230
3-6 |

of 10 g.L
-1


           
           
season begins on the Ecuadorian coast.
Irrigation


         
et al.,

irrigation (C2S1).
Irrigation scheduling for purple king grass
        
et al., 2020), crop
evapotranspiration (ETc) under standard conditions (Chavarría et
al
           




Treatments under study
         

Application of 40 % of the ETc. (L2) Application of 60 % of the ETc.
(L3) Application of 80 % of the ETc. (L4) Application of 100 % of
the ETc.
Study variables
Net assimilation rate (NAR), expressed in g.cm
-2
of leaf area.
day
-1
       




Grass growth rate (GGR), expressed in g.cm
-2
of soil.day
-1
       



by the plant.
Relative growth rate (RGR), expressed in g.g
-1
.day
-1
       




Leaf area index (LAI)
           
         
         
    
area / soil area.
Experimental design and statistical analysis of results



at 45, 90, 135 and 180 days to obtain data. The analysis of results


          
      

et al., 2020).
Results and discussion
Net assimilation rate of grass (NAR)
      
         




           

Table 1. Net assimilation rate of Pennisetum purpureum x
Pennisetum typhoides by eect of controlled decit
irrigation (%ETc) and successive cuttings.
%ETc
Net assimilation rate
of grass (g.dm
-2
.d
-1
)
Cuts
Net assimilation rate
of grass (g.dm
-2
.d
-1
)
40 -0.034366
d
45 days 0.043651
a
60 0.0031326
b
90 days -0.013829
b
80 0.0072065
a
135 days -0.022922
c
100 0.0009842
c
180 days -0.049132
d
a,b,c,d

        


2




and this behaviour can be interpreted as an activation of the response

(45 days) to the last cutting (180 days), the reasons for this reduction in


the depletion of reserves (carbohydrates, nutrients) at the base of the plant

   et al. (2023) this occurs because controlled


=
2 1
2 
log 2 log 1
2 1
1
=
(
2 1
)

(
2
1
)
1
=
(
2 1
)
(
2 1
)
1
This scientic publication in digital format is a continuation of the Printed Review: Legal Deposit pp 196802ZU42, ISSN 0378-7818.
Rev. Fac. Agron. (LUZ). 2025, 42(3): e254230 July-September. ISSN 2477-9409.
4-6 |
Figure 1. Net assimilation rate of Pennisetum purpureum x
Pennisetum typhoide due to the eect of controlled
decit irrigation (%ETc) and successive cuts.
    et al   
et al. (2021) indicated that drought stress

      
      
      et al. 2018). Zhang
et al       

hand, De Oliveira et al. (2024) highlighted that understanding the
        
          
selection of superior genotypes. Finally, in the ecological context it


Grass growth rate (GGR)
    








Table 2. Grass growth rate of Pennisetum purpureum x Pennisetum
typhoides by the eect of controlled decit irrigation
(%ETc) and successive cuttings.
%ETc
Grass growth rate
(g. dm
-2
.d
-1
)
Cuts of the
grass
Grass growth rate
(g. dm
-2
.d
-1
)
40 0.0000709
c
45 days 0.0009727
a
60 0.0000793
bc
90 days -0.0001002
b
80 0.0002409
a
135 days -0.0001025
c
100 0.0002424
a
180 days -0.0001365
d
a,b,c,d



       
2
) ranging

       

        
          

Figure 2. Grass growth rate of Pennisetum purpureum x
Pennisetum typhoide due to the eect of controlled
decit irrigation (%ETc) and successive cuts.
        
         
      et al  
        

       

         
     
-1
   
precipitation, under these conditions Prudencio et al. (2020) found
        
-1
.
day
-1

-1
.day
-1


-1
.day
-1



-1
.day
-1

Relative growth rate (RGR)
      
        
          
          


at 45 days (table 3).


       
2
) ranging





et al
         


et al




y40%ETc= 0,0035-0,000057CP+0,0000002CP2
R2 = 0,9369
y60%ETc= 0,002-0,000033CP+0,00000012CP2
R2 = 0,9343
y80%ETc= 0,0018-0,000026CP+0,000000094CP2
R2 = 0,8904
y100%ETc= 0,002-0,000031CP+0,00000011CP2
R2 = 0,9377
-0,00045
-0,00034
-0,00023
-0,00012
-0,00001
0,0001
0,00021
0,00032
0,00043
0,00054
0,00065
0,00076
0,00087
0,00098
0,00109
0,0012
0,00131
0,00142
45 Days 90 Days 135 Days 180 Days
-1)
Grass cutting
40%ETc 60%ETc 80%ETc 100%ETc
This scientic publication in digital format is a continuation of the Printed Review: Legal Deposit pp 196802ZU42, ISSN 0378-7818.
Chavarría et al. Rev. Fac. Agron. (LUZ). 2025, 42(3): e254230
5-6 |
Table 3. Relative growth rate of Pennisetum purpureum x
Pennisetum typhoides by eect of controlled decit
irrigation (%ETc) and successive cuttings.
%ETc
Relative growth rate
(g.g
-1
.d
-1
)
Cuts
Relative growth rate
(g.g
-1
.d
-1
)
40 -0.00923
d
45 days -0.00891
d
60 -0.00911
c
90 days -0.00227
a
80 -0.00022
b
135 days -0.00299
b
100 -0.00003
a
180 days -0.00441
c

Figure 3. Relative growth rate of Pennisetum purpureum x
Pennisetum typhoides due to the eect of controlled
decit irrigation (%ETc) and successive cuts.
Álvarez

       
         




Leaf area index (LAI)
    
        
and successive grass cuts. The highest LAI occurred at 100 %ETc

180 days (table 4).
Table 4. Leaf area index of Pennisetum purpureum x Pennisetum
typhoides by the eect of controlled decit irrigation
(%ETc) and successive cuttings.
%ETc Leaf area index Cuts Leaf area index
40 0.46
d
45 days 1.17
a
60 0.76
c
90 days 1.09
b
80 1.22
b
135 days 1.02
c
100 1.81
a
180 days 0.96
d
a,b,c,d



       
2
) ranging

y40%ETc= -0,0254+0,000339CP-0,00000145CP2
R
2
= 0,9167
y60%ETc= -0,037+0,000517CP-0,000002CP2
R
2
= 0,9166
y80%ETc= -0,0075+0,00012CP-0,00000041CP2
R
2
= 0,9678
y100%ETc = -0,0018+0,000033CP-0,00000013CP2
R
2
= 0,7822
-0,019
-0,017
-0,015
-0,013
-0,011
-0,009
-0,007
-0,005
-0,003
-0,001
0,001
45 Days 90 Days 135 Days 180 Days
Relative growthrate (g·(g·día)
-1
)
Grass cutting
40%ETc 60%ETc 80%ETc 100%ETc
y40%ETc = 0,645-0,002CP+0,0000025CP2
R² = 0,999
y60%ETc = 0,845-0,00042CP-0,0000025CP2
R² = 0,998
y80%ETc = 1,425+0,0013CP-0,0000025CP2
R² = 0,997
y100%ETc = 1,86-0,0011CP+0,0000049CP2
R² = 0,84
0,00
0,31
0,62
0,93
1,24
1,55
1,86
45 Days 90 Days 135 Days 180 Days
Leaf area index
Grass cutting
40%ETc 60%ETc 80%ETc 100%ETc
Figure 4. Leaf area index of Pennisetum purpureum x Pennisetum
typhoides due to the eect of controlled decit irrigation
(ETc) and successive cuts.
           


          
            

       
et al
       


losses, causing a decrease in the photosynthetic rate (Sosa et al.,
      
       
        
et al
    

44 %.
Conclusions
        



and leaf area index.
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            Pennisetum
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

  
          
      
distance and TOPSIS. Plos one, 19(1), 
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         Pennisetum
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Agropecuaria y de Recursos Naturales, 7(1), 21-29. 

Rasband, W. (2007).       Bethesda,
.
           
          
         Cenchrus purpureus
cv. CT-115, para la región central del estado de Veracruz. Avances en
Investigación Agropecuaria, 23  


Evaluación de la calidad del agua de riego proveniente de la acequia
        
(RAS). Revista Politécnica, 49(2), 55-64. https://doi.org/10.33333/
rp.vol49n2.06

de Pennisetum purpureum    
    Revista Ingeniería Agrícola, 7(2), 13-20. https://

 
       
Agronomy 9,


Revista
ESPAMCIENCIA, 12(2), 131-140. https://doi.org/10.51260/revista_

    
      Panicum maximum
Rev.MVZ Córdoba 23(Supl), 6951-6963. https://doi.
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