Nitrogen and phosphorus effects on growth, and yield of black-eyed bean (Vigna unguiculata L.)

Abstract

The combination of nitrogen and phosphorous plays a vital role in increasing the productivity of black-eyed bean. Therefore, a study was carried out at the Research Farm of Afghanistan National Agriculture Sciences and Technology University (ANASTU), Kandahar, Afghanistan during the spring of 2020 to evaluate the effect of nitrogen (N) and phosphorus (P) doses on the growth, yield and economics of black-eyed bean (Vigna unguiculata L.). The treatment consists of four levels of nitrogen (0, 20, 30 and 40 kg ha-1) in main plots and four levels of phosphorus (0, 30, 60 and 90 kg ha-1) in a sub-plot laid out in a split-plot design and replicated thrice. The plant height, LAI and dry matter accumulation in blacked-eye bean was significantly affected by N and P doses. The grain yield, biological yield and net return of black-eyed bean were significantly higher with the application of 30 kg N ha-1 in combination with 60 kg P2O5 ha-1 in the sandy clay loam soil of Kandahar, Afghanistan.