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Inorganic and Organic Phosphorus Fertilizer Effects on the Phosphorus Fractionation in Wetland Rice Soils

^a Soil Science Division, Bangladesh Rice Research Institute, Gazipur 1701
^b Natural Resource Group, CIMMYT, Bangladesh

View larger version (41K): [in a new window]   Fig. 1. Effect of P inputs on the solution P fraction after 10 yr of rice–rice cropping. Initial = Soil collected after 10 yr from fallow portion of the experimental field; T1 = no chemical fertilizer or cow dung (CD) (control); T2 = 40-8-12-5 kg ha–1 N, P, K, and S in dry season rice and 30-6-9-4 kg ha–1 N, P, K, and S in wet season rice; T3 = 80-16-24-10 kg ha–1 N, P, K, and S in dry season rice and 60-12-18-8 kg ha–1 N, P, K, and S in wet season rice; T4 = 120-24-36-15 kg ha–1 N, P, K, and S in dry season rice and 90-18-27-12 kg ha–1 N, P, K, and S in wet season rice; T5 = T2 + 5 Mg CD and 2.5 Mg ash ha–1; T6 = T3 + 5 Mg CD and 2.5 Mg ash ha–1.

View larger version (27K): [in a new window]   Fig. 2. Effect of P inputs on the NaHCO3–P fraction after 10 yr of rice-rice cropping (bar represent LSD value at 5% level). Initial = Soil collected after 10 yr from fallow portion of the experimental field; T1 = no chemical fertilizer or cow dung (CD) (control); T2 = 40-8-12-5 kg ha–1 N, P, K, and S in dry season rice and 30-6-9-4 kg ha–1 N, P, K, and S in wet season rice; T3 = 80-16-24-10 kg ha–1 N, P, K, and S in dry season rice and 60-12-18-8 kg ha–1 N, P, K, and S in wet season rice; T4 = 120-24-36-15 kg ha–1 N, P, K, and S in dry season rice and 90-18-27-12 kg ha–1 N, P, K, and S in wet season rice; T5 = T2 + 5 Mg CD and 2.5 Mg ash ha–1; T6 = T3 + 5 Mg CD and 2.5 Mg ash ha–1.

View larger version (26K): [in a new window]   Fig. 3. Relationship between different fractions of soil P (mean over 0- to 15-cm depth) and mean annual P uptake by rice (mean of 10-yr P uptake) (* = significant at 5% level, ** = significant at 1% level, ns = not significant).

View larger version (32K): [in a new window]   Fig. 4. Effect of P inputs on the NaOH-Pi fraction after 10 yr of rice-rice cropping (bar represent LSD value at 5% level). Initial = Soil collected after 10 yr from fallow portion of the experimental field, T1 = no chemical fertilizer or cow dung (CD) (control); T2 = 40-8-12-5 kg ha–1 N, P, K, and S in dry season rice and 30-6-9-4 kg ha–1 N, P, K, and S in wet season rice; T3 = 80-16-24-10 kg ha–1 N, P, K, and S in dry season rice and 60-12-18-8 kg ha–1 N, P, K, and S in wet season rice; T4 = 120-24-36-15 kg ha–1 N, P, K, and S in dry season rice and 90-18-27-12 kg ha–1 N, P, K, and S in wet season rice; T5 = T2 + 5 Mg CD and 2.5 Mg ash ha–1; T6 = T3 + 5 Mg CD and 2.5 Mg ash ha–1.

View larger version (37K): [in a new window]   Fig. 5. Effect of P inputs on the acid-P fraction after 10 yr of rice-rice cropping (bars represent LSD value at 5% level). Initial = Soil collected after 10 yr from fallow portion of the experimental field, T1 = no chemical fertilizer or cow dung (CD) (control); T2 = 40-8-12-5 kg ha–1 N, P, K, and S in dry season rice and 30-6-9-4 kg ha–1 N, P, K, and S in wet season rice; T3 = 80-16-24-10 kg ha–1 N, P, K, and S in dry season rice and 60-12-18-8 kg ha–1 N, P, K, and S in wet season rice; T4 = 120-24-36-15 kg ha–1 N, P, K, and S in dry season rice and 90-18-27-12 kg ha–1 N, P, K, and S in wet season rice; T5 = T2 + 5 Mg CD and 2.5 Mg ash ha–1; T6 = T3 + 5 Mg CD and 2.5 Mg ash ha–1.