Effect of Different Dates of Sowing and Irrigation on Growth and Yield of Chickpea cultivars and Evaluation of CROPGRO Chickpea Model
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Date
2018
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Publisher
Acharya N.G. Ranga Agricultural University
Abstract
A field experiment to study the effect of different dates of sowing and
irrigation on growth and yield of chickpea cultivars and evaluation of
CROPGRO chickpea model was conducted during two consecutive years (2015-
2016 and 2016-2017) on farmer’s field at the Maddipadu village of Prakasam
district, Andhra Pradesh.
The treatment consisted of three dates of sowing viz., M1 - 2nd fortnight of
October, M2 - 1st fortnight of November and M3- 2nd fortnight November at nine
irrigation levelsviz., I1 - No irrigation(Control); I2 - Irrigation with aerial water
spray at Pod filling stage (70-75 DAS) @ 5, 000 L ha-1, I3- Irrigation with aerial
water spray at pod filling stage (70-75 DAS) @ 10, 000 L ha-1
, I4- Irrigation with
aerial water spray at pod filling stage (70-75 DAS) @ 15, 000 L ha-1, I5-
Irrigation with aerial water spray at pod filling stage (70-75 DAS) @ 20, 000 L
ha-1
, I6- Irrigation with aerial water spray at maximum vegetative (35-40 DAS)
and pod filling stages (70-75 DAS) @ 5, 000 L ha-1, I7 - Irrigation with aerial
water spray at maximum vegetative (35-40 DAS) and pod filling stages (70-75
DAS) @ 10, 000 L ha-1, I8- Irrigation with aerial water spray at maximum
vegetative (35-40 DAS) and pod filling stages (70-75 DAS) @ 15, 000 L ha-1and
I9-Irrigation with aerial water spray at maximum vegetative (35-40 DAS) and
pod filling stages (70-75 DAS) @ 20, 000 L ha-1 and replicated three times in
strip plot design. With the help of input data DSSAT legume model CROPGRO
was evaluated to study the effect of different dates of sowing and irrigation
levels on yield of chickpea crop cultivar JG-11.
Drymatter accumulation, number of branches plant-1, pod number plant-1
seed yield and haulm yields were significantly increased in the crop sown during
1st fortnight of November. Irrigation levels significantly influenced the days to
reach different phenophases,drymatter accumulation, number of branches plant-1,
pod number plant-1, seed yield and haulm yield. Over all, the irrigation
treatments I8, I9 and I4 and I5 showed similar response in increasing these
attributes. The plant height and test weight were not affected by sowing dates
and irrigation levels. Higher gross returns, net returns and cost benefit ratio were
obtained with 1st fortnight of November and irrigation as aerial water spray @
20,000 L ha-1 at 75 DAS sowing.
Crop sown during 2ndfortnight of October recorded highest growing
degree days to reach maturity. Application of irrigation at maximum vegetative
stage and pod filling stage had prolonged crop duration than application in pod
filling stage alone in I4 and I5 treatments. Maximum heat use efficiency was
recorded with 1stfortnight of November sowing. Among irrigation levels, highest
heat use efficiency was recorded with I5 treatment.
The observed and simulated values of plant height ofthe model RMSE
was 0.5 cm and 0.8 cm for dates of sowings and irrigation level, respectively and
for drymatter accumulation, it was 637.2 kg ha-1and 608.8 kg ha-1.
In case of days to reach maturity, thevalue of RMSE was 0.4 days with
mean deviation of 0.2 per cent among different dates of sowing. Among
different irrigation levels, the RMSE of model was 0.2 days and mean deviation
was 0.2 per cent.
The RMSE of model for seed yield was 34.1 kg ha-1 with mean deviation
of 1.4 per cent with different dates of sowing. Out of three dates of sowing, the
2ndfortnight of November sowing was estimated without any deviation by the
model. Among different irrigation levels, the RMSE of model was 134.7 kg ha-1
and mean deviation was 1.6 per cent.
Description
D5600
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