Water deficit conditions adversely affect the flowering stage of cluster bean which ultimately
leads to reduction in crop yield. During flower initiation use of foliar application of ascorbic acid can be helpful
to mitigate water deficit stress in plant. Therefore, a study was conducted during Kharif season 2019 at Research
area of MNS-University of Agriculture, Multan, Pakistan to evaluate the impact of foliar application of ascorbic
@ 0, 0.5, 1.0 and 1.5 mM on productivity of cluster bean cultivar BR-2017 under normal and skip irrigation
conditions. The treatments were applied according to Randomized Complete Block Design with spilt plot
arrangement and replicated thrice. Growth, physiological, phenological, yield and quality parameters of cluster
bean were recorded. Overall, impact of ascorbic acid on cluster bean productivity was more where normal
irrigation was applied as compared to skip irrigation. The higher level of ascorbic acid 1.5 mM showed more
effect as compared 0.5 and 1.0 mM. However, impact of all ascorbic levels 0, 0.5, 1.0 and 1.5 mM showed
higher response as compared to control where no ascorbic acid was applied. Under normal irrigation, the
ascorbic acid levels 0.5, 1.0 and 1.5 mM showed 15.7, 30.0, and 44.7% increase in grain yield as compared to
control, respectively while in skip irrigation the increase in yield was 16.5, 34.0, and 53.8% as compared to
control, respectively. The results clearly indicate that use of ascorbic acid is very helpful to increase cluster bean
productivity under normal and skip irrigation conditions. Therefore, it is recommended that foliar application of
1.5 mM could be helpful to minimize the drought stress and to achieve the sustainable growth and yield of
cluster bean under water deficit conditions.
Guar bean, BR-2017, sustainable yield, vitamin C
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