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应用~(15)N示踪技术研究了尿素和红萍氮素对水稻分蘖、成穗和产量的影响以及当季水稻对氮素的利用率。结果表明:30十30kgN/ha尿素分别作基肥和分蘖期追肥(U-2),10十20十30kgN/ha尿素分别作基肥、分蘖肥和穗肥(U-3),30十30kgN/ha的红萍分别作基肥和分蘖期追肥(A-2),和不施氮肥对照(CK)处理,水稻分蘖总数分别为465.0,495.0,579.0,403.5万/ha;成穗率分别为81.9％,78.8％,69.8％,74.4％;每穗平均粒数分别为75.8,80.6,78.2,74.7粒。施红萍的稻谷产量与等氮量尿素相当。施用尿素和红萍处理,水稻生长前期平均出蘖速度明显不同,而且水稻不同时期分蘖,其成穗数和每穗粒数均随分蘖时间推移呈逐渐递减变化。试验结果表明:红萍作基肥当季的氮素利用率为41.3—48.2％,高于尿素作基肥的利用率(28.0—31.9％),但尿素作追肥(45.7—46.2％)则优于红萍作追肥(37.5—43.2％)。U-3,A-2,U-2处理当季氮素利用率分别为47.7—50.6％,39.2—45.7％,37.0—38.8％。
The effects of urea and rhizoma mandshurica on tillering, heading and yield of rice and nitrogen utilization rate of rice in the current season were studied using ~ (15) N tracing technique. The results showed that 30-30 kg N / ha urea were used as basal fertilizer and tillering stage top dressing (U-2) and 10-20 30 kg N / ha urea as basal fertilizer, tillering fertilizer and panicle fertilizer (U-3) (A-2) and CK (CK) respectively. The total number of tillers was 465.0, 495.0, 579.0 and 4035 thousand / ha, respectively; the percentage of ear-forming ear was 81.9% 78.8%, 69.8% and 74.4% respectively. The average number of grains per panicle was 75.8, 80.6, 78.2 and 74.7 respectively. Shi Hongping’s output of rice and nitrogen equal amount of urea. The application of urea and red duckweed, the average growth rate of rice at the early stage of the average significantly different, and tillers at different stages of rice, the number of spikelets per panicle and grains per panicle with the tillering time gradually decreased. The results showed that: Rhizoma as a base fertilizer in the season of nitrogen utilization rate of 41.3-48.2%, higher than urea as basal fertilizer utilization rate (28.0-31.9%), but urea as topdressing (45.7-46.2%) is better than red Ping as top dressing (37.5-43.2%). Urea nitrogen utilization rates of U-3, A-2 and U-2 treatments were 47.7-50.6%, 39.2-45.7% and 37.0-38.8%, respectively.