探究保水剂对甜瓜生长发育和水分利用效率的调控效应，为科学施用和推广应用保水剂提供理论依据。在大田条件下，以甜瓜为试材、不施用保水剂为对照，研究了保水剂施用量60、75、90 kg/hm2 3个处理对甜瓜生长发育、产量和水分利用效率的影响。结果表明，施用保水剂较对照不施用保水剂显著促进了甜瓜各生育期蔓的伸长、茎的加粗和叶面积指数的增加。施用保水剂90 kg/hm2处理的甜瓜各生育期的蔓长、茎粗均最高，叶面积指数显著高于其他处理，甜瓜产量、水分利用效率均最高，较不施用保水剂分别显著提高了11.1%、22.8%。综合考虑甜瓜植株生长发育、产量和水分利用效率，推广应用保水剂可以作为景电灌区抗旱节水的一种技术方案，以施用量为90 kg/hm2时效果最佳。

To investigate the regulatory effects of water-holding agents on the growth and development and water-use efficiency in melons so as to provide a theoretical basis for the scientific application and promotion of water-holding agents, the effect of 3 different water-holding agent application rates(60 kg/ha, 75 kg/ha, and 90 kg/ha) on the growth, development, yield and water-use efficiency in melons were investigated under field conditions with melon as the test material and no water-holding agent as the control(CK). Results showed that the application of water-holding agent significantly promoted the elongation of vines, thickening of stems and the increase of leaf area index of melons at all fertility stages. The melon treated with 90 kg/ha of water conservator had the highest vine elongation, stem thickening and leaf area index at all fertility stages, and the highest melon yield and water utilization efficiency, which were 11.0% and 22.8% significantly higher than that of CK, respectively. Considering the growth and development of melon plants, yield and water utilization efficiency, promoting the application of water retaining agent can be a technical solution for drought and water conservation in Jingdian Irrigation District, and the optimum application rate of water retaining agent is 90 kg/ha.

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甘肃省青年科技基金(23JRRD0001)；甘肃省水利科学试验研究及技术推广计划项目(24GSLK025)。