Growth and nutrients uptake by pearl millet-associated weeds as influenced by levels and times of nitrogen application and weed management.

摘要

Biennial field experiments were conducted at Chaudhary Charan Singh Haryana Agricultural University, Hisar during kharif 2003 and 2004 to study the effect of four levels (0, 60, 120 and 180 kg N/ha) of nitrogen (N), three times of its application [full basal at sowing, two splits (1/2 at sowing+1/2 at tillering), three splits (1/2 at sowing+1/4 at tillering+1/4 at milking)] and three weed control treatments on growth and nutrients (N, P and K) uptake by weeds and yield of pearl millet. Weed population at various stages of observation was higher at 60 kg N/ha, however, their growth in terms of dry matter accumulation (g/m2) and N, P and K uptake increased with increasing levels of N, Two splits (1/2 at sowing+1/2 at tillering) and full basal application at sowing recorded higher dry matter and N, P and K uptake at harvest by pearl millet associated weeds. The weed free check (mechanical) followed by atrazine @ 0.5 kg/ha (pre-emergence) reduced the weed growth and nutrient uptake as compared to weedy check.