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INTERACTIVE EFFECTS OF IRRIGATION AND PHOSPHORUS ON GREEN GRAM (VIGNA RADIATA L.)

AMJAD MALIK, FAYYAZ-UL-HASSAN¹, ABDUL WAHEED²*, GHULAM QADIR¹ AND REHANA ASGHAR²

Abstract: Harvested yields of mung bean are generally very low due to relatively little information on its fertilization and irrigation management. Field experiments were conducted to evaluate the interactive effects of irrigation and phosphorus on green gram (Vigna radiata L). Four irrigation levels (I0 = No irrigation), (I₁ = irrigation at vegetative stage), (I₂ = irrigation at vegetative and flowering stage), (I₃ = irrigation at vegetative, flowering and pod formation stage) and five phosphorus doses (P₀ = 0, P₁ = 20, P₂ = 40, P₃ = 60 and P₄ = 80 kg ha^-1) were arranged in a split plot design with four replications. Irrigation treatments exhibited positive effects on yield and yield components. Less than two and more than two irrigations were not economically beneficial. Phosphorus application @ 40 kg P₂O₅ ha^-1 affected the crop positively, below and above this level left non-significant effects. Interactive effects of two irrigations and 40 kg P₂O₅ ha^-1 were most effective. Rest of the combinations remained statistically non-significant to each other. It may be concluded that green gram can be successfully grown under limited water supply when at least two irrigations are given with phosphorus at 40 kg P₂O₅ ha^-1. The response of the crop was consistent during both the seasons; however, it was better during the first season than during the second one, which could be attributed to better climatic conditions.
 

Brandon University, Canada.
¹ Department of Agronomy, University of Arid Agriculture, Rawalpindi, Pakistan
² Department of Botany, University of Arid Agriculture, Rawalpindi-64300, Pakistan.
* Author for correspondence, E-mail: awaheed_dr@yahoo.com