保水剂对土壤和棉花根系生长发育的影响

【研究目的】基于棉田可持续发展的思想，通过盆栽和田间试验主要研究保水剂对土壤和棉花根系生长发育的影响。【方法】利用茚三酮法、钼蓝法及土壤双向切片法。【结果】试验表明：土壤中的保水剂含量在0.030%~0.100%范围内，土壤表面蒸发明显降低，pH值趋于酸化；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，且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，防止棉花旱衰。【结论】在30~45 kg/hm2用量内能够明显提高棉花的产量，增产幅度达10%以上，铃数增加5.7~9.4万个/hm2，铃重增加0.1~0.19g。

Effect of Water Retaining Agent on Soil and Growth and Development of Cotton Root

[OBJECTIVE] Based on theory of sustainable development of cotton field, the bonsai and the field experiments have been carried out to discover the effect of water retaining agent on soil and breading to the growth of cotton. [METHOD] The methods of ninhydrin and molybdenum blue, and bi directional soil section slicing were used. [RESULTS] The experiment results showed that: When content of the polymer in soil was in the range of 0.030%~0.100%, evaporation of soil moisture deceased and the pH value tended to be lowered The study showed that mulching could quicken the growth and development of cotton roots during early growth period, which reflected in the enhanced root visor and the root dry weight per plant. 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 premature senescence. [CONCLUSION] The amount used in 30~45kg/hm-2 could increase the output of the cotton, obviously the production increase scope reaches above 10%, to the textile fiber quality not tremendous influence, the bell number increases 5.7~9.4 ten thousand per /hm2, the bell increases 0.1~0.19g.