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以郑单958为材料,采用田间试验方法,在50 025株/hm2、67 500株/hm2、100 050株/hm2密度下分别设两种株行距配置,探讨增密条件下调控株行距配置对玉米根系性状及产量影响。结果表明,3个种植密度下总体表现为小行距种植方式在0～60 cm土层内的根重密度、根长密度及根表面积密度均高于大行距处理。50 025株/hm2下吐丝期时0～60 cm土层内的根重密度和根长密度在两个株行距配置间差异显著(P<0.05),两个株行距配置的根表面积密度在10叶展、吐丝期和吐丝后25 d差异显著(P<0.05);67 500株/hm2下不同时期两个株行距配置根重密度差异显著(P<0.05),根长密度和根表面积密度在10叶展和吐丝后25 d差异显著(P<0.05);100 050株/hm2下,两个株行距配置间根重密度和根长密度在10叶展和吐丝后25 d差异显著(P<0.05),不同时期根表面积密度差异显著(P<0.05)。同一密度下缩行增株后单株木质部伤流液体积增大,根系供应能力增强,产量增加,50 025株/hm2、67 500株/hm2下产量分别提高了6.76%和4.89%。不同时期0～60 cm土层内根重密度、根长密度和根表面积密度与产量呈正相关,其中10叶展时各根系性状均与产量呈显著正相关。
Taking Zhengdan958 as material, two kinds of spacing arrangement were set up in the field of 50 025 plants / hm2, 67 500 plants / hm2, 100 050 plants / hm2 density respectively, Effects of Maize Root Traits and Yields. The results showed that root density, root length density and root surface density of the small row spacing planting pattern in 0 ~ 60 cm soil layer were all higher than those of the large row spacing at three planting densities. The root density and root length density in 0 ~ 60 cm soil layer at 50 025 plants / hm2 silking stage were significantly different (P <0.05) between the two plant rows. The root surface area density There was a significant difference (P <0.05) in root length density, root length density and root length between the two plants at 67 500 plants / hm2, There were significant differences in surface area density between leaf development and 25 days after silking (P <0.05). Under 100 050 plants / hm2, (P <0.05). The difference of root surface area density in different periods was significant (P <0.05). Under the same densification, the single lumber injury fluid volume increased, the supply capacity of root system increased and the yield increased. The yield of 50 025 plants / hm2 and 67 500 plants / hm2 increased by 6.76% and 4.89% respectively. Root density, root length density and root surface area density in 0-60 cm soil layer were positively correlated with grain yield in different periods. Among them, the root traits at 10 leaf traits were significantly and positively correlated with grain yield.