ESTIMATION OF WATER REQUIREMENT BY CRIWAR MODEL AND PHOSPHORUS FERTIGATION IN BABY CORN
KrishiKosh
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Title |
ESTIMATION OF WATER REQUIREMENT BY CRIWAR MODEL AND PHOSPHORUS FERTIGATION IN BABY CORN
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Creator |
RANGA SWAMY, M
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Contributor |
BABY AKULA
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Subject |
WATER, REQUIREMENT, CRIWAR, PHOSPHORUS, FERTIGATION, BABY CORN
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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. |
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Date |
2016-07-30T14:09:24Z
2016-07-30T14:09:24Z 2008 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/70300
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Language |
en
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Relation |
D8324;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY, RAJENDRANAGAR, HYDERABAD
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