Indian Journal of Weed Science

A field experiment comprising 12 treatment combinations of four weed control methods (atrazine at 1.0 kg ha⁻¹, isoproturon at 1.25 kg ha⁻¹, pendimethalin at 1.2 kg ha⁻¹ and farmer's practice) and three fertility levels (N₅₀P₅₀K₂₅. N₇₅P₇₅K₃₇₅ and N₁₀₀P₁₀₀K₅₀) was conducted at Kukumseri during four consecutive summers of 2000, 2001, 2002 and 2003. Pendimethalin at 1.2 kg ha⁻¹ was very effective against Digitaria sanguinalis. While atrazine at 1.0 kg ha⁻¹ gave lowest count of Amaranth sp. Atrazine recorded lowest total weed dry matter and significantly higher tubers plant⁻¹, tuber yield (32.5 t ha⁻¹), net return (Rs. 93232 ha⁻¹) and B: C ratio (2.53). Pendimethalin and isoproturon were equally good in influencing seed potato yield. Increase in fertility level increased number of tubers, tuber weight plant⁻¹ and tuber yield significantly. 100 kg N, 100 kg P₂O₅ and 50 kg K₂O resulted in 18.6% higher yield and thereby tended to fetch Rs. 18564 more net returns ha_-1 as compared to 50 kg N, 50 kg P₂O₅ and 25 kg K₂O ha_-1.