CROP WEATHER RELATIONSHIP, SOIL WATER BALANCE AND MODELING IN PIGEONPEA VARIETIES UNDER VARIED DATE OF SOWING AND SPACING
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Date
2018-08-31
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University of Agricultural Sciences, Bengaluru
Abstract
A field experiment was conducted at GKVK, UAS, Bengaluru on red sandy
clay loam texture soil during kharif 2015-16 and 2016-17 under rainfed condition. The
18 treatments with three factors consist, row spacing (60, 90 and 120 cm), varieties
(TTB-7 and BRG-2) and date of sowing (May, June and July) replicated thrice by
using RCBD with factorial concept. The results revealed that 60-90 cm row spacing of
TTB-7 sown in May month significantly gave higher grain yield (914 to 1149 kg ha-1)
and use efficiencies of heat, photothermal, heliothermal, hydrothermal, radiation and
water. Besides, showing significantly lower light transmission and higher light
absorption ratio at all phenophases as compared to other treatments. However, wider
row spacing (120 cm) of TTB-7 sown in May month recorded significantly more
duration (179 to 190 days) and took more accumulated heat, photothermal and
heliothermal units as compared to other treatments.
At 45 per cent of PASM (per cent available soil moisture) the decline in yield
of pigeonpea was almost 50 per cent (843 kg ha-1) of the optimum yield. Thus, the
critical limit of PASM to declare drought can be considered at 45 per cent.
Interestingly combination of year and dates of sowing had lower relative mean error
(-97.8 %), root mean square error (231011) and coefficient of residual mass (0.49) for
second date sown pigeonpea in 2015-16. So, we can conclude that coefficients
generated from this combination are more applicable.
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