砂地小麦套作花生的产量优势及其与养分利用效率关系的研究

通过长期定位试验，研究了砂区小麦套作花生、小麦和花生接续种植两种种植方式的产量及施肥效应。结果表明小麦套作花生相对于二作物接续种植有明显的产量优势。4年平均增产分别为27.7%和14.3%，在不施化肥时，这种效应更为明显，但其与施用化肥的增产效应相比甚小。两种方式下，单施或配合施用氮磷化肥均有显著的增产效果，

Studies on Yield Advantage of Wheat and Peanut Relay Inter Cropping System and Its Relation with Nutrient Utilization Efficiency in Sandy Land

The results of a long-term sited experiment that dealt with two cropping systems and their response to fertilization show that there were evident yield advantages in wheat and peanut relay intercropping system with a four-year average wheat yield increase by 27. 7% and peanut by 14. 3% compared with sequential cropping, and it was even greater while applying no chemical fertilizer, but was much little compared to yield response to fertilizer. Both solely and com-binedly applying N and P chemical fertilizers significantly increased yield, and the yield of combined application was the stablest by stability analysis. In wheat and peanut relay intercropping system, the main reasons that rationally combined application of N and P fertilizer (N12P12) sustainablly achieved yield increases were because P promoted the uptake of nitrogen and its utilization efficiency and N enhanced the uptake of P and PUE. It was noted that peanut yield decreased year after year with relay intercropping cycles added, and it was suitable for this system to continue 4 years.