扁秆荆三棱种群密度对棉花形态指标､产量和品质的影响

为明确扁秆荆三棱不同种群密度对棉花形态指标?产量和品质的影响?本试验将扁秆荆三棱种群密度设为0?20?40?60?80?100株/m 26个梯度, 在棉花整个生长期每10 d测一次株高?茎粗和主茎节数, 采收期测棉花单株结铃数?单铃重?产量和纤维品质?扁秆荆三棱对棉花株高?茎粗和主茎节数影响随扁秆荆三棱种群密度的增大而增加?扁秆荆三棱种群密度为80株/m 2时对棉花第6节果枝以上结铃数和单铃重影响最大, 结铃数和单铃重相对于对照分别减少了2.86个和1.82 g?棉花的产量随扁秆荆三棱种群密度的增加而降低, 其中扁秆荆三棱种群密度为20株/m 2时影响不大?对棉花纤维品质的影响主要表现在对棉纤维马克隆值的影响和成熟度的影响?扁秆荆三棱种群密度能显著影响棉花株高?茎粗和主茎节数, 进而对棉花产量产生极大影响?扁秆荆三棱种群密度为20株/m 2时对棉花产量和品质影响不大, 因此应将扁秆荆三棱种群密度控制在20株/m 2以下?

Effects of population density of Bolboschoenus planiculmis on the morphological index, yield and quality of cotton

In order to determine the effects of different population densities of Bolboschoenus planiculmis on the morphological indicators, yield and quality of cotton, the plant height, stem thickness and number of main stem nodes were measured every 10 days during the entire period of cotton, and the number of bolls per plant, single boll weight, yield and fiber quality of cotton were measured during the harvest period, with the population density of B. planiculmis at 0, 20, 40, 80, 100 plants/m 2. The cotton plant height, stem thickness and number of main stem nodes decreased with increasing population density of B. planiculmis, which had the greatest impact on the upper boll number and single boll weight of cotton. When the population density of B. planiculmis was 80 plants/m 2, it had the greatest effect on the boll number and single boll weight of cotton; compared with the control, it decreased by 2.86 and 1.82 g, respectively. The yield of cotton also decreased with increasing population density of B. planiculmis. When the population density of B. planiculmis was 20 plants/m 2, no effect was observed. The effect on cotton fiber quality was mainly reflected in its effect on cotton fiber micronaire value and maturity. The population density of B. planiculmis could greatly affect cotton plant height, stem thickness, and number of main stem nodes, which in turn greatly affected cotton yield. When the population density of B. planiculmis was 20 plants/m 2, no significant impact on cotton yield and quality was observed; therefore, the population density of B. planiculmis should be controlled below 20 plants/m 2.