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ESTIMATION OF WATER REQUIREMENT BY CRIWAR MODEL AND PHOSPHORUS FERTIGATION IN BABY CORN

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Title ESTIMATION OF WATER REQUIREMENT BY CRIWAR MODEL AND PHOSPHORUS FERTIGATION IN BABY CORN
 
Creator RANGA SWAMY, M
 
Contributor BABY AKULA
 
Subject WATER, REQUIREMENT, CRIWAR, PHOSPHORUS, FERTIGATION, BABY CORN
 
Description Models that simulate the water requirement can be of valuable tools in
irrigation management. However, testing of a model is essential for its application in a
new area, while planning for scheduling of irrigation to a crop.
A field experiment was laid out in a randomized block design with seven
treatments replicated thrice during rabi 2007-08, at Students Farm, College of
Agriculture, Rajendranagar, Hyderabad, to generate necessary data required to achieve
the main objective of estimating water requirement in baby corn using CRIWAR
model. CRIWAR (Crop irrigation water requirement) model was developed by Bos
et al. (2002) for windows version 2.0 which was used to estimate water requirement.
CRIWAR is a useful tool in the design of irrigation systems, because it helps in the
estimation of irrigation water requirement of a cropping pattern for a large area.
The experiment consisted of seven treatments viz. drip irrigation at 50 % of
Epan up to 30 DAS and thereafter 75 % of Epan + 75 % of RD of P fertigation (T1),
Irrigation at 50 % Epan up to 30 DAS and thereafter 75 % of Epan + 100 % of RD of
P fertigation (T2), Irrigation at 75 % Epan up to 30 DAS and thereafter 100 % of Epan
+ 75 % of RD of P fertigation (T3), Irrigation at 75 % Epan up to 30 DAS and
thereafter 100 % of Epan +100 % of RD of P fertigation (T4), Irrigation at 100 % of
Epan throughout crop growth + 75 % of RD of P fertigation (T5), Irrigation at 100 %
of Epan throughout crop growth + 100 % of RD of P fertigation.(T6) and Irrigation at
100 % of Epan throughout crop growth + RD of N, P and K.[N application in 4 splits
ΒΌ at basal and rest in 3 splits, P and K as basal](T7). The irrigation treatment i.e. drip at 100 percent of pan evaporation throughout
the crop growing season with fertigation of 100% RD of P (T6) registered significantly
higher baby corn yield (9701kg ha-1) as compared with other treatments. This was due
to more growth and better performance of baby corn in terms of yield attributes owing
to favorable and adequate soil water balance. The lowest baby corn yield (4994 kgha-1)
was registered by the treatment T1 due to low vegetative growth and yield attributes.
Similarly, Field Water Use Efficiency (10.60 kg ha mm-1) was found maximum in
irrigation treatment of T6 i.e. irrigation at 100 per cent of pan evaporation throughout
crop growth + 100 % of RD of P fertigation till maturity.
Crop coefficients for different crop growth sub-periods were estimated and
crop curve was constructed for calculation of irrigation requirement. The irrigation
water requirement (IWR) was the highest (206 mm) in case of T5, T6 and T7 treatments
followed by T3 and T4 treatments (194 mm). Minimum irrigation water requirement
(155 mm) was recorded in treatments T1 and T2, where in irrigation at 50 % of Epan up
to 30 DAS and subsequently irrigation at 75% Epan was followed.
Different test criteria were followed to evaluate the performance of CRIWAR
model. Besides, error per cent was also calculated in all the treatments. Close scatter of
simulated irrigation water requirement (IWR) and respective measured values around
the regression line and 1:1 line indicated better performance of the model in estimating
baby corn irrigation water requirement. CRIWAR model explained and 97 percent
variation in irrigation water requirement (IWR). The estimated RMSE (Root Mean
Square Error) for irrigation water requirement was 15.65 mm. The error percent
calculated in different drip irrigation treatments was within the limit of + 15 and
ranged from -10.3 to -3.23. In case of net irrigation requirement, in all treatments
under estimation of IWR was noticed. Thus, model can be used as a tool in estimating
water requirement and subsequently for irrigation scheduling in baby corn.
 
Date 2016-07-30T14:09:24Z
2016-07-30T14:09:24Z
2008
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/70300
 
Language en
 
Relation D8324;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD