The Effect of Minjingu Phosphate Rock and Triple Superphosphate on Soil Phosphorus Fractions and Maize Yield in Western Kenya

Table 7

Effect of treatments on maize grain yield (t ha⁻¹) at Nyabeda and Khwisero.

Treatment	Nyabeda		Khwisero
	Season
	1	2	1	2
(1) Control	0.95	0.43	1.13	0.10
(2) Tithonia	2.21	0.76	2.87	0.57
(3) TSP + urea (50 kg P ha^−1)	3.47	1.58	3.81	0.94
(4) TSP + tithonia (50 kg P ha^−1)	3.69	1.35	4.34	1.59
(5) MPR + urea (50 kg P ha^−1)	3.22	1.63	3.74	1.11
(6) MPR + tithonia (50 kg P ha^−1)	3.12	1.47	3.19	1.46
(7) TSP + urea (250 kg P ha^−1)	6.49	2.95	5.00	1.71
(8) TSP + tithonia (250 kg P ha^−1)	5.05	2.50	4.34	1.59
(9) MPR + urea (250 kg P ha^−1)	4.03	2.28	5.34	2.02
(10) MPR + tithonia (250 kg P ha^−1)	4.07	2.00	4.97	2.66
s.e.d.	0.50	0.37	0.61	0.25
CV	15	18	12	17

TSP: triple superphosphate; MPR: Minjingu phosphate rock; s.e.d.: standard error of difference between means; CV: coefficient of variance.