Corn yield,nutrient uptake and soil nutrient budget under different long-term phosphorus fertilizations

Le résumé fourni par la source

A 12-year field micro-plot trial with meadow brown soil planted with corn was conducted in Shenyang to study corn yield,nutrient uptake and soil nutrient budget under the long-term impact of different P fertilization methods( application rate and frequency). The results showed that P was not the most important factor affecting the corn yield in this area. Fertilization increased nutrient uptake,with the treatment order of NP N CK,and P application once per six years was better than annual P application. Compared with the background values of soil,fertilization increased the concentrations of total P,Olsen-P,total N and alkali hydrolyzable N in soil plough layer( 0- 20 cm) with the treatment order of NP N CK,while the concentrations of total K and available K declined with the treatment order of NP N CK due to long-term lack of K application. Soil Olsen-P concentration decreased in the treatment with no fertilization and increased in the treatment with only N fertilization,but they both did not change obviously. The soil Olsen-P concentration was increased gradually under the annual P application treatment. In contrast,when under the once per six years P application treatment,the soil Olsen-P concentration was the maximum in the first year after P application,and decreased thereafter,which implied that P application once per six years was better than annual P application for the establishment of soilgrandavailable P pool. On the premise of adequate N application,the quantity of P application was equal to or slightly higher than that of corn uptake with a N / P ratio between 1: 0. 167 and 1: 0. 5 for the balance of soil nutrient budget.

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