Effects of Organic and Inorganic Materials on Soil Acidity and Phosphorus Availability in a Soil Incubation Study

Table 2

The experimental treatments.

Treatment	P source	P rate (kg ha^−1)
		From organics	From inorganics	Total P
(1) Control	—	0	0	0
(2) Tithonia (60 kg P ha^−1)	Tithonia	60	0	60
(3) FYM (60 kg P ha^−1)	FYM	60	0	60
(4) MPR (60 kg P ha^−1)	MPR	0	60	60
(5) TSP (60 kg P ha^−1)	TSP	0	60	60
(6) BPR (60 kg P ha^−1)	BPR	0	60	60
(7) Tithonia (20 kg P ha^−1) + MPR (40 kg P ha^−1)	Tithonia and MPR	20	40	60
(8) Tithonia (20 kg P ha^−1) + (TSP 40 kg P ha^−1)	Tithonia and TSP	20	40	60
(9) Tithonia (20 kg P ha^−1) + BPR (40 kg P ha^−1)	Tithonia and BPR	20	40	60
(10) FYM (20 kg P ha^−1) + MPR (40 kg P ha^−1)	FYM and MPR	20	40	60
(11) FYM (20 kg P ha^−1) + TSP (40 kg P ha^−1)	FYM and TSP	20	40	60
(12) FYM (20 kg P ha^−1) + BPR (40 kg P ha^−1)	FYM and BPR	20	40	60
(13) Tithonia (20 kg P ha^−1)	Tithonia	20	0	20
(14) FYM (20 kg P ha^−1)	FYM	20	0	20
(15) MPR (40 kg P ha^−1)	MPR	0	40	40
(16) TSP (40 kg P ha^−1)	TSP	0	40	40
(17) BPR (40 kg P ha^−1)	BPR	0	40	40

FYM: farmyard manure; TSP: triple superphosphate; MPR: Minjingu phosphate rock; BPR: Busumbu phosphate rock.