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本文以高粱籽粒高产为目的,采用适合于生产上的种植密度,对不同株高的粒用高粱品种、杂交种群体进行生产能力和光合能力比较研究。研究结果表明,中秆杂交种具有最高收获指数,获得最高籽粒产量。但是,我国当前生产上种植的中秆杂交种都属于叶片宽长且平展的株型,在LAI 较高的生育后期,群体过于郁蔽,透光通风不良,导致 NAR 值偏低,因而限制了单位面积生物产量和籽粒产量的提高。这也说明我国自60年代末推广杂交高粱晋杂5号至今,由于一直保持这种株型,而未能育成具有突破性高产品种。选育更高产的粒用高粱,应将选择重点放在开花后群体在较高 LAI 情况下,仍能保持较好通风透光群体结构的株型改良上,以便有较高的 NAR值。为此,似应选择叶片较短窄且上挺的紧凑型中秆杂交种。
In this paper, the sorghum grain yield for the purpose, using suitable for the production of planting density, different plant height grain sorghum varieties, hybrid population production capacity and photosynthetic capacity comparative study. The results showed that medium-stalk hybrids had the highest harvest index and the highest grain yield. However, the current production of silage hybrids in China belong to the plant type with long and flat leaves. In the later growing stage of LAI, the population is too dark and the light and ventilation is poor, resulting in low NAR value, which limits Biomass yield per unit area and grain yield increase. This also shows that since the late 60s of our country to promote cross hybrid sorghum Jin 5 so far, as has been to maintain this plant type, and failed to breed with breakthrough high yield varieties. Breeding of higher grain yield for sorghum should focus on the selection of populations after flowering at higher LAI cases, can still maintain the structure of the better ventilation and light of the plant type improvement in order to have a higher NAR value. To this end, it may be desirable to select the leaves of the shorter narrow and upright compact stalk hybrids.