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

Table 5

Economic evaluation of fertilizer Blend B application Timbilil and Kagochi sites.

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	2140	8,560	77,040	14355	4125	214,000	535,000	309,520	225,480	0	0
	75	6	13,800	2336	9,344	84,096	14355	4125	233,600	584,000	349,976	234,024	389	33
	150	12	27,600	2816	11,264	101,376	14355	4125	281,600	704,000	429,056	274,944	235	80
	225	18	41,400	2854	11,416	102,744	14355	4125	285,400	713,500	448,024	265,476	159	6
Kagochi	0	0	0	1420	5,680	51,120	14355	4125	142,000	355,000	211,600	143,400	0	0
	75	6	13,800	1870	7,480	67,320	14355	4125	187,000	467,500	286,600	180,900	312	75
	150	12	27,600	1859	7,436	66,924	14355	4125	185,900	464,750	298,904	165,846	155	−2
	225	18	41,400	1742	6,968	62,712	14355	4125	174,200	435,500	296,792	138,708	97	−20

“−” denotes a negative value.