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分蘖多穗青贮专用玉米的最适收获期为乳熟末期至腊熟初期,其生物产量构成因素为株数×单株鲜重(单株鲜重=单株鲜穗重+单株茎重+单株叶重),为探索适宜的种植密度以获取较大的生物产量,对分蘖多穗玉米新品系新青2、3号进行6个密度处理。结果表明,不同密度处理对两个品系的生物产量差异不显著,但与生物产量构成相关因素分蘖、单株穗数、单株鲜穗重、单株叶重却达显著和极显著。相关分析表明,侧穗位高与生物产量呈显著正相关(R=0.626 )主穗位高、侧茎高、侧茎粗、单株穗数、单株叶重与生物产量呈正相关,其余性状与生物产量呈弱负相关。说明分蘖多穗玉米主要靠分蘖成株成穗率获得较高的生物产量,在栽培管理中注意合理密度和留分蘖个数。其在低密度时靠分蘖成株成穗获得较高的生物产量,在高密度时靠单株发育同样获得较高的生物产量。
The optimum harvesting period for tillering and multi-spike silage maize was from the end of milk ripening to the early ripening stage, and the components of its biological yield were number of plant × fresh weight per plant (fresh weight per plant = fresh spike per plant + weight of single plant per plant In order to explore the suitable planting density for obtaining larger biomass, 6 new density lines of tillering and multi-spike maize line Xinqing 2,3 were treated. The results showed that there was no significant difference in biomass yield between the two lines under different densities, but significant correlation was found between tiller number per plant, spike number per plant, fresh weight per plant and leaf weight per plant. Correlation analysis showed that the ear height was significantly and positively correlated with the biomass (R = 0.626). The height of the ear, the height of the stem, the height of the lateral stem, the number of panicle per plant, the leaf weight per plant and the biomass were positively correlated with each other And biological production showed a weak negative correlation. The results showed that tillering and multiple ear corn mainly got the higher biomass by the tillering rate of adult plant ear, and paid attention to the reasonable density and the number of tillers left in the cultivation management. At low density, the tillering success of the adult plant produces higher biomass, and at the same time, higher biomass is obtained from the development of the plant at high density.