Effects on Dry Matter Accumulation and Transport and Yield of Spring Maize:Nitrogen and Phosphorus Double Removal and Reduction under Shallow Buried Drip Irrigation
To investigate the effects of nitrogen and phosphorus double removal and reduction on yield,dry matter accumulation and translocation of spring maize under shallow buried drip irrigation,the four treatments of N2P2 nitrogen and phosphorus constant,N2P2 nitrogen fertilizer 30％ reduction,N2P2 phosphorus fertilizer 30％ reduction and N2P2 nitrogen and phosphorus both 30％ reduction were set up to determine the SPAD value,leaf area index,dry matter accumulation and yield of spring maize using conventional fertilization as the control.The results showed that compared with CK,yield of N2P2 increased by 4.71％ and 3.84％ in 2019 and 2020,and the leaf SPAD value,leaf area index increased,dry matter accumulation and translocation contribution to kernel and yield all increased significantly.Under the nitrogen and phosphorus double removal,constant fertilizer application increased the dry matter accumulation and improved the dry matter transport to grain;the dry matter accumulation,translocation contribution to seed grain and yield all decreased under 30％ reduction of phosphorus and nitrogen fertilizer;the yields of 2019 and 2020 respectively decreased by 3.22％ and 3.84％ under 30％ reduction of phosphorus fertilizer at the N1 level,and the yields of 2019 and 2020 respectively decreased by 8.23％ and 16.35％ under 30％ reduction of nitrogen fertilizer at the P1 level.
shallow buried drip irrigationcornnitrogen and phosphorus double shift reductionmaterial accumulation and translocationyielddry matter accumulationtranslocation
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