膜下滴灌条件下不同品种棉花干物质积累变化研究

Research on the Dry Matter Accumulation of Different Cotton Varieties under Plastic Mulch Drip Irrigation

【方法】选用当地主栽棉花品种标杂A1和新陆早33号,设置不同灌水量和氮肥用量。【目的】积累变化及品种间差异。分析膜下滴灌棉花干物质。【结果】两棉花品种在整个生育期干物质积累总量呈现慢-快-慢的增长趋势,随着灌水量和氮肥用量的增加干物质积累总量在增加,最大增长速率增大,快速增长期推后,但过量的灌溉会使干物质积累总量有所减少。【结论】标杂A1在各处理中干物质积累均大于新陆早33号,在低水处理中品种间差异不显著,中高水处理品种间差异显著。

【Method】The experiment selected the major local cotton varieties BiaozaA1 and Xinluzao33 as test materials and designed different irrigation water quantity and nitrogen（N） fertilizer quantity.【Objective】Dry matter accumulation and differences between varieties were analyzed.【Result】Result indicated that the total dry matter accumulation showed the change pattern of ＂slow-fast-slow＂ in two cotton varieties during the whole growing stage.The total dry matter accumulation were increased with the increase of irrigation water quantity and nitrogen fertilizer quantity,the maximum increasing rates augmented,and fast rising periods were delayed.But over-irrigation would lead to decrease of the total dry matter accumulation.【Conclusion】Biaoza A1 was higher in dry matter accumulation than Xinluzao33 at different treatments;the difference was not significant between varieties between varieties in low irrigation,but significant in medium and high irrigation.