Effect of Row Spacing and Frequency of Weeding on Weed Infestation, Yield Components, and Yield of Rice (Oryza sativa L.) in Bench Maji Zone, Southwestern Ethiopia

Table 7

Partial budget analysis to estimate net benefit for weed management practices of rice in 2020 main cropping season.

Row spacing (cm)	Weeding frequency	Average yield (kg·ha^−1)	Adjusted yield (kg·ha^−1)	Gross benefit (ETB·ha^−1)	Total variable cost (ETB·ha^−1)	Net benefit (ETB·ha^−1)
30	W1	3690.00	3321.00	36531.00	1897.40	34633.60
	W2	3876.00	3488.40	38372.37	1897.40	36474.97
	W3	3086.67	2778.00	30558.03	1897.40	28660.63
	W4	4508.70	4057.83	44636.16	3097.40	41538.76
	W5	5016.67	4515.00	49665.03	10297.40	39367.63
	W6	1200.00	1080.00	11880.00	697.40	11182.60
25	W1	4433.26	3989.94	43889.31	1963.14	41926.17
	W2	4696.60	4226.94	46496.34	1963.14	44533.20
	W3	4372.93	3935.63	43291.97	1963.14	41328.83
	W4	5005.86	4505.27	49558.01	3163.14	46394.87
	W5	5616.66	5054.99	55604.93	10363.14	45241.79
	W6	1692.70	1523.43	16757.73	763.14	15994.59
20	W1	3955.92	3560.33	39163.64	2148.00	37015.64
	W2	4493.32	4043.99	44483.84	2148.00	42335.84
	W3	3943.32	3548.99	39038.87	2148.00	36890.87
	W4	4715.55	4244.00	46683.98	3348.00	43335.98
	W5	5046.65	4541.99	49961.84	10548.00	39413.84
	W6	1713.29	1541.96	16961.54	948.00	16013.54

ETB = Ethiopian birr; and seed rates of 60, 48.3, and 43 kg·ha⁻¹ were used for 20, 25, and 30 cm row spacing, respectively; cost of seed for planting = 15.80 ETB·kg⁻¹; field price of rice grain = 11.00 ETB·kg⁻¹; cost of hand weeding and hoeing at 2 WAE 72 persons, 35 DAE 48 persons @birr 50 per person; WAE = weeks after crop emergence; W = weeding frequency; W1, W2, and W3, are weeding by hand weeding and hoeing at 2, 3, and 4 WAE, respectively; W4 = weeding by two-hand weeding and hoeing at 2 and 5 WAE, W5 = weed-free check, and W6 = weedy check.