Sensitivity analysis of basmati rice (Oryza sativa L.) to weather parameters using WOFOST model
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Date
2018
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CCSHAU
Abstract
The experiment entitled “Sensitivity analysis of Basmati rice (Oryza sativa L.) to weather parameters using WOFOST model” was conducted at the research farm of Chaudhary Charan Singh Haryana Agricultural University, Rice Research Station, Kaul (Kaithal), Haryana. The treatments included three dates of transplantingviz.2nd fortnight of June, 1st fortnight of July and 2nd fortnight of July in the main plots and four cultivars namely CSR-30, PB-1121, PB-1 and Haryana Basmati-2 in the subplots, resulting in 12 treatment combinations. The experiment was laid out in a split-plot design with each treatment replicated four times. The crop was raised with recommended package of practices. Among the different transplanting environments, Early transplanting i.e. 2nd fortnight of June took more number of days to attain physiological maturity as compared to delayed transplanting. Among the varietiesCSR-30 took maximum number of days to attain physiological maturity followed by HB-2, PB-1121 and PB-1. The early transplanted crop took more number of days to attain maturity and accumulated higher growing degree days. Among the varieties the maximum growing degree days (2631 °C days) were accumulated by CSR-30 followed by variety Haryana Basmati-2 (2537 °C days), PB-1121(2517 °C days) and PB-1(2480 °C days) to reach physiological maturity. Similar trend was also observed in case of HTU, PTU accumulation. The crop transplanted during 1st fortnight of July utilized thermal time more efficiently with highest HUE followed by 2nd fortnight of June and 2nd fortnight of July transplanted crop during the growing season. Higher HUE was recorded in variety CSR-30 followed by variety, Haryana Basmati-2, PB-1121 and PB-1during crop season. Highest grain yield was recorded by crop transplanted during 2nd fortnight of June followed by 1st fortnight of July and 2nd fortnight of July and among the varieties, the grain yield of Haryana Basmati-2 was highest followed by PB-1121, PB-1 and CSR-30. The WOFOST model was validated by using previously calibrated coefficients and the model simulation for phenology, grain yield and maximum LAI was within acceptable limit except straw yield. The sensitivity analysis of rice to weather parameters was also carried out using the WOFOST model by altering the weather parameters in weather input file of the model. It was found that the crop phenology is more affected by the minimum temperature alteration by +2 °C and the yield and LAI of delayed transplanted crop was more affected by the sunshine hour‟s variation.
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