Nitrogen Management in Soybean: A Review
2019
Bhangu, Ritu | Virk, Harpreet Kaur
Soybean (Glycine max) is a leguminous crop grown worldwide for its dual qualities viz. high protein and oil content. It contains about 40–42% protein and 20–22% oil and is one of the major cash crop of the rainy season. The plant growth parameters like plant height, leaf area index (LAI), and dry matter accumulation of soybean increased with the application of nitrogen from 30–80 kg N ha–¹. Nodule number and nodule dry weight increased with the application of 40 kg N ha–¹and decreased afterward whereas, yield and yield attributes of soybean increased with the application of nitrogen up to 100 kg ha–¹. Application of nitrogen from 40–80 kg N ha–¹ as basal dose resulted in an increase in protein content. The split application of nitrogen as basal and at reproductive stages also resulted in an increase in protein content. However, oil content decreased with increasing level of nitrogen. The oil content increased with the application of nitrogen up to 40 kg N ha–¹. Application of nitrogen also improved soil properties like organic carbon, available NPK, and saturated hydraulic conductivity.
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