Studies on winged bean, psophocarpus tetragonolobus (L.), nutrition in laboratory environment

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Abstract
A study of winged beans ‐Psophocarpus tetragonolobus (L.)‐ fertilization was performed on laboratory environment. Three major plant nutrients, N, P and K were used in increasing amounts to determine the effectiveness of each of above nutrient in the plant development. The plants were grown for two months under controlled light, humidity and temperature control. Under those experimental conditions and data obtained there was no positive effect of N treatment, rather negative, preventing nodule formation and effectiveness of other nutrients. The most significant nutrient, according to the experiments, is P, showing the highest increase in green and dry mass. The K is most effective at low me dium ratios and is suggested only on K poor soils. The best recommendation, according to this experiments for winged bean fertilization, is 0–2–1 fertilizer ratio.

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