液体地膜覆盖对棉花根系生长发育的影响

基于棉田可持续发展的思想，利用茚三酮法、钼蓝法及土壤双向切片法，研究了液体地膜覆盖对棉花根系生长发育的影响。结果表明，覆盖棉花前期根系生长发育加快，表现为根系活力增强，根系干重较大，但覆盖不利于棉花根系下扎，土壤深层根系衰减较快。与塑料地膜覆盖相比，液体地膜覆盖增强根系吸收与合成能力的效应在棉花各生育阶段均较明显，根系在土壤内分布较为合理，土壤深层根系衰减较慢，更有利于棉株均衡生长发育，防止棉花早衰。在棉花生产上，采用液体地膜覆盖栽培是一项可行技术．

Effects of liquid film mulching on cotton root growth and development

Based on the theory of sustainable development of cotton field, effects of liquid film mulching on the growth and development of cotton roots were observed by with the methods of ninhydrin and molybdenum blue, and hi-directional soil section slicing, respectively. The study showed that mulching could quicken the growth and development of cotton roots during early growth period, which reflected in the enhanced root vigor and the root dry weight per plant. However, mulching was disadvantageous for cotton roots to penetrate into deep soil layers, and deep roots decreased quickly. Compared with plastic film mulching, liquid film mulching obviously increased the absorption and synthetic ability of cotton roots during whole growth period. The distribution of root systems in soil was comparatively reasonable, and deep roots decreased slowly, which contributed to the proportional development of cotton plants, and prevented cotton plants from pre - mature senescence. It was suggested that the application of liquid film could be a feasible technique in cotton cultivation practice.