摘要
通过二次饱和-D最优设计，研究了密度和氮肥二因素对粮饲兼用型玉米陕单8806群体生理性状的影响．得到了高产高效栽培的密度和施肥水平为：密度65985～70470株／hm^2；氮肥用量359．70～479．55kg／hm^2．明确了其适宜群体的叶面积指数为4．2～4．6，作物生长率为15．31～16．69g／（d·m^2）．吐丝至吐丝25d期间的植株总光能截获量在90％以上，同时保证穗位以下叶的光能截获量不低于19．8％。进一步分析发现．在一定范围内随着密度和施氮量增加，群体叶面积和干物质增加．尤其是在吐丝后，保证适宜的密度，增加氮肥施用量有利于延缓叶片衰老，促进干物质增长。
The optimum design of secondary saturation-D was adopted for this test. The effects of density and nitrogen on physiological characteristics of populations of shaandan8806 foodstuff Zea rnays were studied. Growth measurements showed an optimum population density of 65 985--70 470 plants/hm^2. Nitrogen application of 359.70--479.55 kg/hm^2 resulted in a high yield and high production benefit in summer planting areas of Shaanxi province. The leaf area index of the optimum colony was 4. 2--4. 6, and CGR was 15. 31--16. 69 g/（d · m^2）. Light interception of the total plant was about 90% while that under the spike leaf was more than 19.8% during tassel period to 25 days after tassel. Leaf area and population dry matter increased （especially af- ter spinning） when density and nitrogen were enhanced. The feasible densities and high nitrogen can retard leaf senescence and accelerate dry matter production after spinning.
出处
《草业学报》
CSCD
2007年第2期118-123,共6页
Acta Prataculturae Sinica
基金
科技部农业科技成果转化基金项目(04EFN217100390)资助
关键词
玉米
粮饲兼用
密度
氮肥
群体性状
Zea mays
both foodstuff and feedstuff
nitrogen
density
population characteristics
