Abstract: 【Objective】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. 【Method】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. 【Result】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. 【Conclusion】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.

Key words: Magnesium compound fertilizer, Day lily, Growth, Soil Nutrient