Nutrient Budget and Economic Assessment of Blended Fertilizer Use in Kenya Tea Industry

Table 6

Economic evaluation of standard NPK applied to tea in Timbilil and Kagochi.

Site	N rates in kg·ha^−1	Bags of NPK(S) ha^−1 required	Total cost of fertilizer at KSh 2,300/bag of 50 kg	kg·Mt·ha^−1·yr^−1 (TPP)	Production in kg of GL·ha^−1·yr^−1	Cost of plucking (KSh)	Cost of pruning (KSh)	Cost of weeding (KSh)	Cost of collection and processing (KSh)	Gross earnings from made tea ha^−1·yr^−1 (KSh)	Total cost of production (KSh)	Gross profit ha^−1·yr^−1 (KSh)	Average physical product (APP)	Marginal physical product (MPP)
Timbilil	0	0	0	2132	8,528	76,752	14355	4125	213,200	533,000	308,432	224,568	0	0
	75	5.8	12,470	2329	9,316	83,844	14355	4125	232,900	582,250	347,694	234,556	402	34
	150	11.5	24,725	2679	10,716	96,444	14355	4125	267,900	669,750	407,549	262,201	233	61
	225	17.3	37,195	3099	12,396	111,564	14355	4125	309,900	774,750	477,139	297,611	179	72
Kagochi	0	0	0	1683	6,732	60,588	14355	4125	168,300	420,750	247,368	173,382	0	0
	75	5.8	12,470	1781	7,124	64,116	14355	4125	178,100	445,250	273,166	172,084	307	17
	150	11.5	24,725	1810	7,240	65,160	14355	4125	181,000	452,500	289,365	163,135	157	5
	225	17.3	37,195	1800	7,200	64,800	14355	4125	180,000	450,000	300,475	149,525	104	−2

“−” denotes a negative value.