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通过对不同青贮玉米品种群体光合性能指标的研究结果表明,不同青贮玉米品种叶面积指数、光合势、群体生长率在整个生育期均呈单峰曲线变化,峰值出现在散粉至乳熟期间,因不同品种而异。净同化率则呈“马鞍”型曲线变化。多分蘖品种科试1号、植株高大品种东陵白与农大647在生育期间叶面积指数和光合势均较高,东陵白生育前、中期群体生长率显著高于其它品种,且高值持续时间较长,这是其生物产量高的生理基础。生产中,采取合理栽培措施,克服此类品种植株高大、个体繁茂、群体郁蔽导致植株病害和倒伏严重的不足,可实现青贮玉米群体生物产量的进一步提高。
The results of the research on photosynthetic characteristics of different silage maize populations showed that the leaf area index, photosynthetic potential and population growth rate of different silage maize varieties showed single peak curve throughout the growth period, Different varieties vary. The net assimilation rate showed a “saddle” type curve changes. Multi-tillering cultivar Kexia No.1, Donglingbai and Nongda 647 with high plant height had higher leaf area index and photosynthetic potential during the growth period, and the growth rate of the population before and during the white tomb growth was significantly higher than that of other cultivars, and the high value continued A long time, this is the biological basis of its high biological yield. Production, to take reasonable cultivation measures to overcome such varieties of tall plants, lush individual, lead to plant groups lush and lodging serious shortage of silage corn population can be achieved to further improve the biological yield.