Effects of Saturation Degree of Calcium and Nitrogenous Fertilizers on the Behaviour of Phosphates in the Tea Soil
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The effects of saturation degree of calcium and nitrogenous fertilizers on the dissolution of phosphates in the tea soil weve investigated.<BR>The absorption of phosphorus in yellow, brown, and black tea soils on Makinohara plateau at various pH values was determined by M. SHIOIRI's method.<BR>The absorption of phosphorus of the 3 types of tea soils remarkably increased with decreasing pH from 7.0 to 3.0.<BR>Monocalcium phosphate, dicalcium phosphate, diammonium phosphate and dipotassium phosphate were supplied to yellow and black soils at the rate of 1.0 g. P<SUB>2</SUB>O<SUB>5</SUB>/100 g. in yellow soils and 1.5 g. P<SUB>2</SUB>O<SUB>5</SUB>/100 g. in black soils with various saturation degrees. of calcium (2.3, 25, 50, 75, 100, 125%), and these soils were incubated under upland soil condition for 2 months.<BR>The phosphats of these soils soluble in 0.002 N sulphuric acid (pH: 3.0), 1 % ammonium sulphate (pH: 5.55), 0.8% ammonium chloride (pH: 5.4), and 0.6o ammonium nitrate (pH: 5.5) solutions were determined after incubation.<BR>The soluble phosphates eluted into these solutions were increased with increasing saturation degree of calcium, but those of black soils were exceedingly little, and the effect of saturation degree of calcium upon the eluted phosphate was not observed in the dipotassium phosphate plot of black soil.<BR>The order of solubility of these phosphates in 0.002N sulphuric acid solution was as follows: dicalcium phosphate>dipotassium phosphate>diammonium phosphate>mono-calcium phosphate in yellow soil and dicalcium phosphate>monocalcium phosphate=dipotas-sium phosphate=diammonium phosphate in black soil.<BR>The order of soluvency of 1% ammonium sulphate, 0.8% ammonium chloride and 0.6% ammonium nitrate solution to the supplied phosphates was as follows : ammonium sul-phate>ammonium chloride> ammonium nitrate in yellow soil and ammonium sulphate>ammonium nitrate>ammonium chloride in black soil.
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