SIMULATING THE IMPACT OF CLIMATE CHANGE ON EVAPOTRANSPIRATION OF PEA (Pisum sativum L.) USING CROPWAT MODEL
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Date
2019-10
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UHF,NAUNI
Abstract
ABSTRACT
A field experiment was conducted during Rabi season of 2017-18 in randomized block
design with three replications in pea crop under different environmental conditions. The experiment
consists of two dates of sowing viz., 1st and 15th December 2017 with three cultivars (Azad P-1, PB-89
and ESP-111) under two irrigation levels I1 (3 days interval) and I2 (6 days interval), in the
Experimental Farm, Department of Environmental Science, College of Forestry, Dr Y S Parmar
University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. The results indicated that
pod and seed yield was observed higher in PB-89 as well as in HI and LAI in first date of sowing at I1
level. The ET rate (1.79 mm/day) and radiation use efficiency (14.77 MJ/m²/day) was observed higher
in D2 as compared to D1 (1.59 mm/day and 14.19 MJ/m²/day) respectively. But, water use efficiency
of pea under different environments was higher in D1 for both pod and grain yield (481.62 and 253.55
kg/ha/mm) as compared to D2 (452.85 and 232.4 kg/ha/mm), respectively. Among varieties, the water
use efficiency was also observed higher in PB-89 for pod 334.67 and grain 187.15 kg/ha/mm followed
by Azad P-1 (323.13 and 178.2 kg/ha/mm) and ESP-111 (276.67 and 120.53 kg/ha/mm), respectively.
The consumptive use of water was more in I1 level followed by I2 for all three cultivars under
different environments. The total crop evapotranspiration, effective rainfall and irrigation water
requirement was recorded by CROPWAT at the rate of 219.5 mm/dec, 93.5 mm/dec and 144.8
mm/dec, respectively. With the existing temperature, the model predicted an average seasonal ET of
1.59 mm day-1 along with a seasonal irrigation water requirement of 144.8 mm. When the temperature
increased to +2 o C, the model projected water requirement of pea from 144.8 mm to 151.4 mm also a
significant increase in ET rate from 1.59 mm day-1 to 1.63 mm day-1. The model was highly correlated
(R2= 94.6) for first date of sowing as compared to second date of sowing (R2= 89.2) which mean that
pea must be sown on or before 1st December in the mid hills of Himachal Pradesh.
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