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大豆冠层截获的太阳辐射强度是其产量和产量构成要素的重要决定因素。通过对3个粒重不同的大豆品种(系)生殖生长期进行不同的光处理,研究了田间条件下,高密度(54株.m-2)、中密度(27株.m-2)和低密度(14株.m-2)群体光富集及遮阴对大豆植株产量及其构成特征的影响。结果表明:光富集处理显著增加大豆单株荚数和产量,在低、中和高密度条件下,不同品种(系)单株产量增加幅度分别为26.2%~57.2%、27.7%~71.7%和10.8%~61.4%。遮阴显著降低大豆荚数和产量,不同密度条件下,单株产量相应减少幅度分别为37.1%~46.1%、34.4%~49.7%和41.7%~55.0%。光富集显著增加大豆主茎中下部节位的荚数,在低密度群体下,3个品种大豆主茎1~6节位的荚数分别由7.5个增加到17.3个、5.6个增加到10.1个和6.9个增加到17.2个,并显著减少底部节位的空荚率。光富集和遮阴有增加和减少每荚粒数的趋势,在低密度群体下,光富集使海339每荚粒数显著上升,由2.17上升到2.36,在中密度和高密度有使其每荚粒数上升的趋势但差异不显著。在低密度和中密度下,黑农35每荚粒数显著上升,分别由1.93和1.78上升到2.26和2.13,在高密度下,光富集也使垦农18每荚粒数显著上升,由1.89上升到2.08。在低密度下,遮阴使垦农18每荚粒数由2.17减少到1.97。光富集和遮阴对粒重也有一定影响,在低密度群体下,遮阴增加垦农18和海339粒重8%~11%,而在高密度群体下,遮阴降低海339百粒重17%,百粒重的变化与种植密度及品种有关。单株荚数和粒数的改变是对产量贡献最大的因子。
Solar radiation intensity intercepted by the canopy of soybeans is an important determinant of its yield and yield components. The effects of high light density (54 plants .m-2), medium density (27 plants .m-2) and high density (27 plants) on the reproductive growth of three soybean cultivars with different grain weight Effect of Light Enrichment and Shading on Population Yield and Its Composition of Soybean at Low Density (14 Strains. M-2) Population. The results showed that light harvest enrichment significantly increased the pods per plant and yield. Under low, medium and high density, the yield per plant of different varieties (lines) were 26.2% -57.2%, 27.7% -71.7% And 10.8% ~ 61.4%. Shading significantly reduced the number of pods and yield of soybean. Under different densities, the corresponding decreases in yield per plant were 37.1% -46.1%, 34.4% -49.7% and 41.7% -55.0%, respectively. Light enrichment significantly increased the pod numbers of the lower node in the main stem of soybean. Under the low density population, the pod numbers of 1 ~ 6 node of soybean main stem increased from 7.5 to 17.3 and 5.6 increased to 10.1 And 6.9 increase to 17.2, and significantly reduce the empty rate at the bottom node. Light enrichment and shading had the trend of increasing and decreasing the number of pods per pod. Under the low density population, light enrichment increased the number of pods per litter 339 significantly from 2.17 to 2.36, and at medium and high density The number of pods per grain increased but the difference was not significant. At low density and medium density, the number of pods of Heinong 35 increased significantly from 1.93 and 1.78 to 2.26 and 2.13, respectively. Under high density, light harvesting also increased the number of pods per Keni 18 significantly from 1.89 rose to 2.08. At low density, shading reduced the number of Kenneth 18 seeds per pod from 2.17 to 1.97. Light enrichment and shading also had some effect on grain weight. Under low density population, shading increased 8% ~ 11% of Kennamen 18 and sea 339, while shading reduced 339 Weight 17%, 100-weight changes and planting density and variety. Changes in pods and kernels per plant are the most contributors to yield.