Green Global
Foundation   Journal
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IRRIGATION-YIELD RESPONSE FACTOR OF MUSTARD AT DIFFERENT GROWTH PHASES (Pages : 15 - 21)

Yield response factor (ky) of Mustard (Brassica rapa L.) was determined from field experimental data at Bangladesh Agricultural Research Institute, Gazipur during two consecutive years (2012 to 2013). There were six irrigation treatments: sprinkler irrigation at vegetative stage; sprinkler irrigation at pre-flowering stage; sprinkler irrigation at pod formation stage; sprinkler irrigation at vegetative + pod formation stage; sprinkler irrigation at pre-flowering + pod formation stage; and basin irrigation at vegetative, pre-flowering, and pod formation stage; respectively. The ky value varies depending on growth stages as well as among seasons. Overall, the ky for pre-flowering + pod formation, vegetative + pod formation, vegetative + pre-flowering, pre-flowering, and vegetative stages were 0.15, 0.16, 0.27, 0.03, and 0.08, respectively. According to the value of yield response factor, the most critical growth stages were in the order: vegetative + pre-flowering>vegetative + pod formation>pre-flowering + pod formation>vegetative>pre-flowering stage. For the whole growing period, the ky values were 0.52, 0.96, 1.17, 0.13, and 0.75 for water deficit at pre-flowering + pod formation, vegetative + pod formation, vegetative + pre-flowering, pre-flowering, and vegetative stages, respectively. There were no statistical difference in paired’t’ test at 5% level of significant for individual growth stages and entire growth period. The sensitivity index (lembda i, of Jensen model) for pre-flowering + pod formation, vegetative + pod formation, vegetative + pre-flowering, pre-flowering, and vegetative stages were 0.07, 0.08, 0.13, 0.009, and 0.03, respectively. Therefore, vegetative and pre-flowering stages were the critical stages to water deficit and water supply is utmost important to reduce excessive yield loss.Download