镁作为中量植物营养元素已得到广泛的关注，对其生理功能及其在提高作物产量与改善农产品品质等方面的研究也已有较详尽的报道I‘-‘］。近年来，植物镁营养的基因型差异也引起国内外学者的广泛兴趣。据报道，向日葵、玉米及羊茅等植物均存在明显的镁营养品种差异性，且主要表? Magnesium as a medium amount of plant nutrition has received extensive attention, and its physiological function and its research on improving crop yield and improving the quality of agricultural products have also been reported in more detail. In recent years, genotypic differences in plant magnesium nutrition have also attracted widespread interest of scholars at home and abroad. It is reported that sunflower, corn and fescue and other plants there are obvious differences in magnesium nutritional varieties, and the main form?