Effects Of Different Phosphorus Source On Soybean Growth And Transformation Of Soil P

In this paper, we studied effects of different phosphorus source conditions on soybean growing development and soil phosphorus transformation by calcium phytate and rock phosphate on soybean biological character, phosphorus nutrition absorption and soil phosphorus transformation by sand culture and root box. We aim to dig the biological utilization potential of soil phosphorus nutrition and soybean continue to contribute to increase production. The main results were described as follow:1、Potassium dihydrogen phosphate processing was made the two varieties of phosphorus efficiency of soybean biomass, root-shoot ratio, phosphorus accumulation to reach the highest, then the 1/2 calcium phytate+1/2 rock phosphate processing, and the sole treatment of calcium phytate or rock phosphate was lowest. Under the condition of different phosphorus source, the phosphorus efficient genotypes soybean 7018’s biomass, root-shoot ratio, root absorption area and phosphorus accumulation were significantly higher than that of phosphorus inefficient genotype soybeans in Heihe 35.2、Acid phosphatase activity was calcium phytate>1/2 calcium phytate+1/2 rock phosphate>rock phosphate>potassium dihydrogen phosphate from big to small in turn in two soybean varieties. Inefficient genotype soybeans in Heihe 35 root acid phosphatase activity in potassium dihydrogen phosphate treatment, rock phosphate, 1/2 calcium phytate+1/2 rock phosphate and calcium phytate treatment, respectively is phosphorus efficient genotypes soybean 7018’s 1.34, 1.36, 1.53, and 1.43 times.3、Add three kinds of low molecular weight organic acids can increase soybean root-shoot ratio, and the same phosphorus source of soybean root cap ratio was: oxalic acid treatment > citric acid treatment > malic acid treatment.Add three kinds of low molecular organic acids were significantly reduced the acid phosphatase activity of rock phosphate and 1/2 calcium phytate+1/2 rock phosphate, and the potassium dihydrogen phosphate treatment and calcium phytate treatment had no significant effect.4、Different phosphorus source of soybean rhizosphere soil soluble phosphorus bacteria have a significant impact.Soybean rhizosphere soil phosphate-solubilizing bacteria has a direct relationship with the different phosphorus source. Potassium dihydrogen phosphate processing had the highest soybean rhizosphere dissolved phosphorus microbial.phosphate-solubilizing bacteria have apparent rhizosphere effect, as the distance from the root surface increases gradually, gradually reduce the content of phosphate-solubilizing bacteria.Potassium dihydrogen phosphate processing soybean rhizosphere phosphorus transfor-mation intensity is significantly higher than other processing. Application of organophosphorus or inorganic phosphorus stimulates the dissolved inorganic phosphorus in the activity of microorganism, promote the mineralization rate of organophosphorus or inorganic phosphorus dissolving rate, thus improve the content of available phosphorus in soil.5、Under different phosphorus source treatment, soil available phosphorus content increases with the increase of the distance from the root surface. Potassium dihydrogen phosphate treatment significantly increased the soil inorganic phosphorus content of each component, application of calcium phytate, rock phosphate during the training period had no obvious effect on soil inorganic phosphorus different components.