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在合肥先后共用六个组合(品种)进行了三年播种量试验。结果表明,秧苗密度时苗质在三叶期前无显著影响,三叶期后影响日益加大。秧苗单株叶面积、干物重、分蘖数等均与密度呈显著负相关,回归线近似y=1/(a+bx)曲线。3—5、5—7和7—9叶期单株叶面积和地上干重的增长量,较300苗/米~2下降50%以上的临界密度,依次为2000、1200和600苗/米~2左右。单株干重增长速度降低10%,分蘖速度下降12.5—29.5%。5,7,9叶期可发分蘖成蘖率<20%的临界密度依次为2500,1500和600苗/米~2左右。苗质对大田产量的影响随着秧龄延长而加大。在秧大田比保持一定的情况下,苗质对大田产量的影响一般小于秧苗密度对苗质的影响。
In Hefei have shared six combinations (varieties) for three years of seeding test. The results showed that there was no significant effect of seedling density on seedling density before the three-leaf stage, but the influence after the three-leaf stage was increasing. The leaf area per plant, dry matter weight, tiller number and so on were all significantly and negatively correlated with the density. The regression line was similar to y = 1 / (a + bx) curve. The leaf area and above-ground dry weight per plant at 3-5, 5-7 and 7-9 leaf stages increased by more than 50% over 300 seedlings / m 2, followed by 2000, 1200 and 600 seedlings per meter ~ 2 or so. Dry weight per plant decreased by 10%, and tillering speed decreased by 12.5-29.5%. The critical density of 5, 7, 9 leaf tiller tillering rate <20% followed by 2500, 1500 and 600 seedlings / m ~ 2 respectively. The effect of seedling quality on field output increased with the extension of seedling age. In the seedling field than to maintain certain circumstances, the impact of seedling quality on field yield is generally less than the density of seedling on the impact of quality.