再生水灌溉农田氮素监测及水肥耦合研究展望

再生水灌溉,是缓解水资源紧缺状况的一个重要措施,在缓解农田土壤旱情的同时,为农田注入了一定量的N、P营养物质,可明显地提高作物产量(可达到10%以上)。但是,在大量使用再生水灌溉的同时,也必须加强对农田氮素动态变化过程的监测,并据此适量调整减小施肥数量,以避免农田氮素过量而导致农田生态环境的恶化和水体的污染。提出了农田氮素监测和据此分析确定灌溉施肥数量的研究设想,包括研究内容、方法、拟解决的关键技术问题,以及预期成果和应用前景等。

Prospects for the Study on Nitrogen Monitor and Nutrient-Water Interactions Under Recycled Water Irrigation

Using recycled water for irrigation is an important measure relaxing water deficient tension status,can give nitrogen to soil besides alleviating drought,and rise crop yield (more than 10%) as a result of containing nitrogen in recycled water.Nitrogen must be monitored and fertilizer quantity must be changed (produced generally) in the field irrigated by using recycled water in order to a- void water contamination owing to excessive nitrogen in soil.In this paper a research plan of monitoring nitrogen in soil and determi- ning the scheduling of fertilizer and irrigation based on monitored concentration of nitrogen is suggested,include research content and method,key problems to be solved,anticipant results and prospect to put these results to use.