Effect of plant density and nitrogen fertilization on growth and yield of rice bean (Vigna umbellata)

An experiment was conducted during the rainy (kharif) season of 1991 and 19 92 on sandy-loam soil, to determine optimum row spacing and nitrogen level for the maximum growth and yield of rice bean [Vigna umbellata (Thunb.) Ohw i & Ohashi]. Closer spacing of 30 cm x 10 cm gave higher seed and stover yi eld of 5.18 and 26.0 q/ha respectively. Similarly, the seed yield was the m aximum (6.3 q/ha) with 40 kg N/ha, followed by 60 kg N/ha (6.0 q/ha). The s tover yield was the highest at 60 kg N/ha (30.1 q/ha). The net return was t he maximum in 30 cm x 10 cm spacing and 40 kg N/ha.