花铃期水氮互作对膜下滴灌杂交棉花产量与水分利用效率的影响

以早熟杂交棉石杂2号为材料,在花铃期进行了7个水分处理和4个氮素处理的水氮互作对杂交棉花产量和水分利用效率影响的大田试验。研究结果表明,在不施氮(N0)情况下,花铃期轻旱和中旱显著降低了棉花产量。在低频小灌量(5 d-18 mm)条件下,施氮籽棉产量差异不显著;在高频大灌量(3 d-30 mm)水分处理中,随着施氮量的增加,籽棉产量显著下降;在对照(75%FC),高频小灌量(3 d-18 mm)和低频大灌量(5 d-30 mm)三个水分处理中,水氮互作显著提高了棉花的产量和水分利用效率。综合考虑产量和水分利用效率,在杂交棉花花铃期以低频高灌量和高频低灌量(日耗水量6 mm)两个水分处理在施N 300 kg/hm2时为北疆杂交棉花较适宜的灌溉策略和施氮量。

A study on effect of interactions of water management and nitrogen fertilizer on yield and water use efficiency in hybrid cotton during flowering-bolling stage in drip irrigation under mulch

A field experiment, including seven water treatments and four nitrogen treatments, was conducted to e-valuate the effects of interaction of water management and nitrogen fertilizer on yield and water use efficiency during flow- ering-bolling stage of hybrid cotton Shiza No. 2 in Shihezi in 2008. The results showed that cotton yield decreased signif-icantly under mild water stress and moderate water stress during flowering-bolling stage under the condition of no-nitrogen treatment but insignificantly compared with 5 d-18 mm irrigation in each level of N-application. With nitrogen increas-ing, the cotton yield decreased significantly in 3 d-30 mm water treatment. The cotton yield and water use efficiency in-creased significantly under 75% FC and 3d-18 mm and 5 d-30 mm irrigation conditions. Therefore, it could be con-cluded from the comprehensive effect of interactions of water and nitrogen of cotton yield and water use eficiency that 5 d-30 mm and 3 d-18 mm water treatments with 300 kg/ hm² nitrogen rate were the optimal irrigation strategy and nitro-gen application for hybrid cotton in Northem Xingjiang.