S T U D Y O F E V A P O T R A N S P I R A T I ON O F W H E A T C R O P IN V A R Y I NG S O I L M O I S T U R E C O N D I T I O NS
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Date
1991
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mpkv, rahuri
Abstract
The present investigation to study the evapotranspiration, water use
efficiency, and crop coefficient of wheat crop in varying soil moisture conditions
was conducted by laying out a field experiment on the Agronomy Farm at College
of Agriculture, Pune-5 during the post-rainy season of 1989-90. The objectives
of the investigation were to study the evapotranspiration, water use efficiency
at different soil moisture depletion levels, to work out the crop coefficient at
different growth stages and to schedule the irrigation of wheat crop for optimum
yield. The experiment has seven treatments and was replicated two times.
The irrigation was given to each treatment as per IW/CPE ratio. The soil
moisture was taken just before irrigation with the help of neutron probe. The
evapotranspiration (ET) was calculated by using soil moisture depletion method.
The various biological observations like leaf number, plant height, total dry
matter and its components, leaf area and leaf area index were recorded at various
physiological growth stages. The potential evapotranspiration (PET) was calculated
by using modified Penman method. The vapour pressure deficit (VPD) was
calculated by using psychrometric chart. The data required for calculations of
ABSTRACT (Continued)
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PET and VPD like maximum and minimum temperature, bright sunshine hours,
open pan evaporation, vapour pressure etc. was collected from the Central
Agricultural-Meteorological observatory located on the farm of the College of
Agriculture, Pune-5. The experimental field was 400 meter away from the
observatory. The water use efficiency was calculated by taking the ratio of total
dry matter produce to consumptive use. The crop coefficient was calculated at
different physiological growth stages by taking the ratio of AET to PET.
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msc
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