RADIATION AND THERMAL USE EFFICIENCY OF PEA CROP UNDER DIFFERENT ENVIRONMENTAL CONDITIONS
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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 to the radiation and
thermal use efficiency of pea crop under different environmental conditions. The experiment
consist of two dates of sowing viz 1st and 15th December 2017-18 with three cultivars Azad P1,
PB-89 and ESP-111under two orientations level O1 (N-S) and O2 (E-W), in the
Experimental Farm under the Department of Environmental Science, College of Forestry, Dr
YS Parmar University of Horticulture and Forestry, Nauni, Solan, Himachal Pradesh. The
results indicated that Azad P-1, PB-89 and ESP-111 took 113, 115 and 121 days and to
911.86, 895.10 and 986.80 °C day GDD, respectively to reach physiological maturity under
first date of sowing. Similarly, for second date of sowing Azad P-1, PB-89 and ESP-111 took
109, 107 and 114 days and to 869.57, 883.13 and 978.71 °C day GDD, respectively to reach
physiological maturity A significant increasing trend was observed in different thermal units
viz GDD, HTU, PTU and HYTU with days after sowing for various phenophases of Pea
cultivars at varying environment. The thermal units explained 65.9 per cent variation in
canopy development (LAI) and 66.1 per cent variation in grain yield of Pea cultivars. Heat
use efficiency with respect to pod and grain was found higher for V2 followed by V1 and V3
due to higher dry matter production under V2. It was found higher in case of earlier sown
crop than late sown. A decreasing trend was observed in radiation use efficiency with delayed
sown crop. Among varieties the radiation use efficiency was higher in V2 (PB-89) followed
by V1 (Azad-P1) and V3 (ESP 111) in respect of row orientation, the highest radiation use
efficiency was recorded in N-S as compared to E-W sown crop at flowering, pod formation
and maturity. The soil temperature, temperature within canopy, evapotranspiration, LAI, HI
and dry matte was higher in N-S orientation compared to E-W orientation whereas, relative
humidity was higher in E-W orientation than N-S in Pea cultivars.
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