Effect of nano urea foliar spray on yield and yield attributes of black gram (Vigna mungo L.)

Foliar application of nano urea is a good option of nitrogen or a balanced dose of nitrogen to increase the yield of black gram. For that, this study was conducted to evaluate the performance of black gram (Vigna mungo L.) under two forms of nitrogen at the Bangladesh Institute of Nuclear Agriculture (BINA) sub-station experimental field, Chapainawabganj during September to December 2022. Black gram variety Binamash-2 and 3 treatments, viz. Control (no fertilizer) (T₁), Farmers practice (recommended fertilizer application as basal dose and top dressing during active growth) (T₂) and Nano urea (2-4 ml of nano urea (4 % N) in one litre of water and sprayed on crop leaves at its active growth stages) (T₃) were used under randomized block design. Yield and yield contributing characters were significantly affected by different forms of nitrogen (urea). The highest grain yield was obtained with T₃ which was 1587.33 kg per hectare whereas T₁ had given the lowest yield (983.33 kg per hectare). It was obvious that grain yield of black gram can be increased substantially with the judicious application of nano urea as foliar spray during active growth stages.

Keywords: Nano urea; Black gram; Foliar spray; Legume crop.