土壤磷、肥料磷和VA菌根真菌对植物磷营养的贡献

CONTRIBUTION OF SOIL 32 P, FERTILIZER 32 P AND VA MYCORRHIZAL FUNGI TO PHOSPHORUS NUTRITION OF CORN PLANT

P labelled fertilizer and five synthetic phosphates (dicalcium phosphate, octocalcium phosphate, iron phosphate, aluminium phosphate and apatite), which were used to simulate inorganic phosphates such as Ca 2 P,Ca 8 P, Fe P, Al P and Ca 10 P in calcareous soil, were applied to corn plants inoculating with and without vesicular arbuscular (VA) mycorrhizal fungi in a calcareous soil. The results showed that VA mycorrhizal fungi and dicalcium phosphate, octocalcium phosphate, iron phosphate, aluminium phosphate promoted growth and increased phosphorus content of corn plant. The four synthetic phosphates except apatite had higher contributions to corn plant growth than VA mycorrhizal fungi. Contributions of fertilizer P, soil P and synthetic phosphates to phosphorus nutrition of corn plant were in order of synthetic phosphates (except apatite) >soil P>fertilizer P. Inoculating with VA mycorrhizal fungi increased the contribution of soil P and decreased the contribution of synthetic phosphates, but did not affect the contribution of fertilizer P. \ \