Nutrient uptake, use efficiency and productivity of bread wheat (Triticum aestivum L.) as affected by nitrogen and potassium fertilizer in Keddida Gamela Woreda, Southern Ethiopia

Environmental Systems Research

Table 9 Profitability as affected by N and K fertilizer rates

Treatments		Wheat yield kg ha⁻¹		Adjusted dawn10% kg ha⁻¹		Income ETB ha⁻¹		GFB	TVC	NB	MRR
N	K	GY	SY	GY	SY	Grain	Straw	ETB	ETB ha⁻¹	ETB ha⁻¹	(%)
0	0	1041	3285	936.7	2957	14,051	2365	16,416	–	–	–
	30	1789	3353	1610	3018	24,145	2414	26,559	3275	23,284	309.7
	60	1692	3389	1523	3050	22,842	2440	25,282	4175	21,107	D
23	0	2198	3519	1979	3167	29,678	2534	32,212	3567	28,645	D
	30	2255	3779	2030	3401	30,445	2721	33,166	4467	28,699	106
	60	2250	3360	2025	3024	30,376	2419	32,795	5367	27,429	D
46	0	3270	4550	2943	4095	44,145	3276	47,421	4259	43,162	D
	30	4392	4992	3953	4493	59,297	3594	62,891	5159	57,733	1719
	60	3500	4261	3150	3835	47,255	3068	50,323	6059	44,264	D
69	0	3229	4726	2906	4253	43,592	3402	46,994	4951	42,043	D
	30	4278	5395	3850	4856	57,750	3885	61,635	5851	55,784	1627
	60	3326	5235	2993	4711	44,901	3769	48,670	6751	41,919	D

Urea cost = 14.54 Birr kg⁻¹, Kcl, cost = 18 Birr kg⁻¹, UREA cost = 13.84birr Birr kg⁻¹ of N, wheat grain per ha = 15 Birr kg⁻¹, straw = 0.8 Birr kg⁻¹ application cost = 500 Birr ha⁻¹, MRR (%) Marginal rate of return, D Dominant, GFB Gross field benefit, TVC Total Variable Cost, NB Net Benefit