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

Table 4

Economic evaluation of fertilizer Blend A application 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	2052	8,208	73,872	14355	4125	205,200	513,000	297,552	215,448	0	0
	75	6	13,800	2532	10,128	91,152	14355	4125	253,200	633,000	376,632	256,368	422	80
	150	12	27,600	2683	10,732	96,588	14355	4125	268,300	670,750	410,968	259,782	224	25
	225	18	41,400	2995	11,980	107,820	14355	4125	299,500	748,750	467,200	281,550	166	52
Kagochi	0	0	0	1654	6,616	59,544	14355	4125	165,400	413,500	243,424	170,076	0	0
	75	6	13,800	1975	7,900	71,100	14355	4125	197,500	493,750	300,880	192,870	329	54
	150	12	27,600	1808	7,232	65,088	14355	4125	180,800	452,000	291,968	160,032	151	−28
	225	18	41,400	1795	7,180	64,620	14355	4125	179,500	448,750	304,000	144,750	100	−2

TPP: total physical product, GL: green leaf, MPP: marginal physical product, and APP: average physical product.