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应用~(15)N 示踪法研究了北京地区水稻利用红萍氮源的情况。在红萍繁殖期间,不同水准的磷肥对其生物量无明显作用;但随施磷量的增加,其体内氮素积累有所提高。施磷的红萍翻压后,稻谷含氮量随施磷量的增加而提高。比较了单施尿素式红萍及两者配施对稻谷产量的影响及~(15)N 在水稻和土壤中的分布情况。结果表明,尿素和红萍配施有较好的效益。在水稻插秧期放养红萍,3周后再撒施尿素,水稻对肥料氮素的利用率及稻谷产量都较高。
The use of ~ (15) N tracer method to study the use of Hongping red nitrogen in rice in Beijing. During the breeding of Rhodiola rosea, different levels of P fertilizer had no significant effect on its biomass; however, with the increase of P application, the nitrogen accumulation in the body increased. Phosphorus Phosphorus red pressure, the nitrogen content of rice increased with the increase of phosphorus. The effects of single application of red duckweed and their combination on paddy yield and the distribution of ~ (15) N in rice and soil were compared. The results show that urea and red duckweed with a good benefit. Red clover was planted during rice transplanting period and urea was sprayed 3 weeks later. The utilization rate of rice nitrogen to fertilizer and rice yield were both higher.