Effects of magnesium compound fertilizer on daylily (Hemerocallis citrina Baroni) growth and soil nutrients

chinois. 探讨红壤旱地、特别是低肥力红壤旱地中镁对作物生长及产量的影响，为镁肥的合理施用和含镁复合肥的研制奠定进一步的基础。利用田间试验方法，研究了两种不同镁含量的复合肥对黄花菜生长、产量及红壤旱地养分含量的影响，并对其生长过程中土壤养分、作物生长等的变化进行了系统观测。两种含镁复合肥对促进黄花菜生长发育、提高黄花菜产量和抗病能力均具有良好效果，其中含镁量较高的镁肥II增产效果更优，比不施肥处理增产57.4%，比施氮磷钾处理增产32.8%，比含镁较低的镁肥I增产14.5%。两种含镁复合肥对土壤交换性镁和氮磷钾含量亦具有一定影响。其中施用镁肥II处理土壤碱解氮、速效磷、交换性钾及交换性镁含量分别比对照提高94.9%、46.5%、31.1%和35.3%。施用含镁复合肥可以明显提高黄花菜的产量、改善土壤养分状况。在红壤旱地土壤、气候和生产力水平等条件下，为保证作物优质、高产，在现有施肥结构的基础上，应考虑施用镁肥。

anglais. This paper was to explore the effects of magnesium in dry lands of red soil on the growth and yield of crops, especially for that with low fertility, and to give guidance for application and development of magnesium compound with fertilizer. The effects of two kinds of magnesium compound fertilizer on daylily (Hemerocallis citrina Baroni) growth, yield and soil nutrients in red soil were studied, and the change of soil nutrients and daylily growth was observed systemically in field experiments. The results showed the favorable effects of magnesium compound fertilizers on improving daylily growth, and increasing its yields and strengthening disease resistance. The effects of magnesium compound fertilizer II (higher Mg content) were better than others, which increased daylily yield by 57.4% and 32.8% than that of in control and NPK treatments, respectively, increased daylily yield by 14.5% as compared with the magnesium compound fertilizer I (lower Mg content). In addition, alkalizable N, available P, exchangeable K and Mg in soil treated with magnesium compound fertilizer II were increased by 94.9%, 46.5%, 31.1% and 35.3% as compared with the control. It is concluded that application of magnesium compound fertilizers on red earth is a good method of keeping higher yield and higher quality of crops and soil fertility.