Evapotranspiration, water use efficiency and thermal time requirements of green gram (Phaseolus radiatus).

Book Title: NA
Year Published: 2003
Month Published: NA
Author: Rao, A. S. ; Singh, R. S.
Book Group Author: NA
Abstract:

In an experiment conducted in the arid region of Jodhpur, Rajasthan, India during 1996-98, the evapotranspiration (ET) rate of Phaseolus radiatus [Vigna radiata] cv. S 8 was 2.6 to 4.1 mm per day during early growth, 4.2-5.8 mm per day at the peak vegetative stage, 5.0-5.7 mm per day at the flowering or pod formation stage, and 1.6-4.4 mm per day at physiological maturity. Seasonal ET was 310 mm with an average yield of 672 kg/ha, resulting in a water use efficiency of 2.17 kg ha-1 mm-1. The crop coefficient (ratio of actual to potential ET) was 0.36-0.59 at the early growth stage, 0.72+1.10 at the peak vegetative stage, 0.90-0.97 at the flowering or pod formation stage, and 0.29-0.71 at the maturity stage. Irrigation up to 100% ET rate enhanced grain yield from 592 kg/ha to 1 563 kg/ha during the low rainfall year of 1998. The thermal time (growing degree 7 days) in relation to crop phenology, leaf-tip initiation and branch appearance from mainstem of the crop were also determined. The day-time energy balance study showed that the excessive water loss from the irrigated crop due to advection was 77% at 30 days after sowing (DAS), 133% at 45 DAS and 58% at 75 DAS.

Pages: 18 - 22
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Volume: 73
Number: 1
Journal: Indian Journal of Agricultural Sciences
Journal ISO: NA
Organization: NA
Publisher: NA
ISBN: NA
ISSN: 0019-5022
DOI: NA
Keywords:

crop growth stage, crop yield, energy balance, energyconsumption, evapotranspiration, green gram, plant water relations,water use efficiency, India, Rajasthan, Vigna radiata, Vigna,Papilionoideae, Fabaceae, Fabales, dicotyledons, angiosperms,Spermatophyta, plants, eukaryotes, South Asia, Asia, DevelopingCountries, Commonwealth of Nations, India, energy use, energyutilization, mung bean, Field Crops (FF005) (New March 2000), PlantWater Relations (FF062), Plant Production (FF100)

Source: EBSCO
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