氮肥效应对直播大麦产量及若干生育指标的影响

在浅旋耕直播的条件下，通过氮肥效应对大麦产量及有关生育指标的影响研究，结果表明：不同施氮量处理与产量呈曲线相关关系，Ｙ＝２１１９．０５＋４２．３１ｘ—０．１２１６ｘ￣２（ｒ＝０．９９６７）．其高产适宜施氮量为１７４ｋｇ／ｈｍ￣２；高产值为５７９９ｋｇ／ｈｍ￣２；经济施肥量为１３８ｋｇ／ｈｍ￣２．同时还从每公顷苗数、叶面积系数、光合势、净光合生产率及干物质积累等方面，阐明了适宜施氮量获得高产的群个体协调发展的基础．

EFFECT OF NITROGEN FERTILIZER ON THE YIELD AND GROWING & DEVELOPING TARGET OF DIRECT-SRRDING BARLEY

A linear regression equation, Y = 21 19.05+42.31x-0. 1216x2 (r=0.9967 ), had been established by studying on effect of nitrogen fertilizer on the growing and developing tragers of direct-seeding barley. From the research, it was concluded that the optimum amount of pure nitrogen was 174.0 kg/ hm2, and the amount of economical pure nitrogen was 138.0kg / hm2. The highest yield of the direct-seeding barley was 5799.0 kg / hm2, resulting form the physiological basis of coordinating development individual and population in barley, according to the dynamic analysis of number of seedling, developing of leaf area, photosynthetic potentical, net assimilation rate and accumulation or dry matter. The results were useful to increase the yield of direct-seeding barley in Shanghai suburbs.