Sitallization Phosphate Powder Affecting Micro-environment Characteristics of Poplar Seedling Rhizosphere Soil

doi:10.11924/j.issn.1000-6850.casb15100126

Abstract

Abstract: The effect of sitallization phosphate powder with mean grain size of 7.26 μm (MP1) and 4.04 μm (MP2) on rhizosphere soil characteristics of‘Lulin No.1’seeding was studied by the method of pot experiment. Three fertilizer treatments were conducted: without phosphatic fertilizer (CK), superphosphate (SP) and common phosphate powder (MP0). The results showed that the organic acid content of MP2 and SP had no significant difference, which was 43.55% , 21.89% and 10.15% higher than that of CK, MP0 and MP1, respectively. The total sugar content of MP1, MP2 and SP had no significant difference, which was significantly higher than that of CK and MP0. No significant difference was found in the amino acid content among all the treatments. The pH value of MP2 was 0.31, 0.17 and 0.12 units lower than that of CK, MP0 and MP1, respectively. Electric conductance of SP and MP2 had no significant difference, but was significantly higher than that of other treatments. The cation exchange capacity of SP and phosphate powder treatment was significantly higher than that of CK, and there was no significant difference between SP and MP0, MP1, MP2. Available phosphorus content of MP2 increased by 35.19%, 14.45% and 7.85% in comparing with that of CK, MP0 and MP1, respectively. However, phosphate powder treatment had little effect on available potassium, exchangeable calcium and magnesium. The sitallization phosphate powder treatment could increase organic acid content in root exudate and increase available phosphorus content in rhizosphere soil, the increasing range was bigger when the grain size was smaller, indicating that small sitallization phosphate powder grain size could increase the soil phosphorus supply ability.

CLC Number:

S157.4

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