Field experiments were conducted in kharif seasons of 1976 and 1979 at the College of Agriculture Farm. Rewa with T9 blackgram. Three row-spacings (30. 45 and 60 cm as main plot treatments) were tried with four levels of P (0.25, 50 and 75 kg/ha PO as sub-plot treatments) The yield and yield-attributing characters, including root-nodu lation, were favourably influenced by wider row-spacings and higher P levels. A row spacing of 30 cm and 75 kg P,0./ha were found optimum for sandy-loam soil for black gram. For the clay-loam soil. this crop needs 45 cm spacing and 50 kg P₂O/ha.
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