【摘要】 中国南方红壤区菜地普遍存在缺镁现象,蔬菜生产上适量添施镁肥具有重要的现实意义。目前有关蔬菜施用镁肥的效应研究报道尚不多,尤其是我国南方红壤区菜地的相关研究则更少。采用田间小区试验方法,在农户常规施用化肥的基础上,对红壤菜地添施不同剂量的镁肥,研究施镁对蔬菜产量、营养元素吸收及菜地土壤基本肥力状况的影响规律。结果表明:在常规化肥施用的基础上,适量地添施镁肥(施硫酸镁112.5⁴50.0 kg hm^-2),小白菜增产幅度为12.4%²0.4%,氮、磷、钾及镁等营养元素的吸收量分别提高27.7%⁴2.5%、30.1%⁸4.9%、38.0%⁸0.3%和53.2%¹31.9%,蔬菜收获后土壤全镁和交换性镁含量分别提高15.8%⁶8.4%和29.0%¹19.0%。小白菜产量与施镁肥量可用一元二次方程y=-0.53x2+60.61x+9093（R2=0.961**）较好地线性拟合,由该方程可以得出,当施硫酸镁量为381.2 kg hm^-2时,小白菜可获得最高产量,即10825.8 kg hm^-2。更多还原

【Abstract】 Magnesium deficiency is a common phenomenon in vegetable field of red soil in the south of China, thus it is important to apply magnesium fertilizers in vegetable production. At present there were not many researches about the effect of applying magnesium fertilizer in vegetable production especially in red soil region of southern China.Hence, a field trial with different doses of magnesium fertilizer was conducted to test the effects on vegetable yield,nutrient element uptake and soil fertility. Results showed that the application of magnesium fertilizer(magnesium sulfate, 112.5-450.0 kg hm^-2) increased the yield of Chinese cabbage by 12.4%-20.4%. The amount of nitrogen,phosphorus, potassium and magnesium absorbed by vegetable increased by 27.7%-42.5%, 30.1%-84.9%, 38.0%-80.3% and 53.2%-131.9%, respectively. Moreover, the amount of total magnesium and exchangeable magnesium in the vegetable soil after harvest was enhanced by 15.8%-68.4% and 29.0%-119.0%, respectively. The yield of Chinese cabbage and the application amount of magnesium were well fitted by a quadratic equation with one unknown[y =-0.53x2 + 60.61 x + 9093（R2 = 0.961**）]. Based on this equation, the yield of Chinese cabbage would be the highest(10825.8 kg hm^-2), when the application amount of magnesium sulfate fertilizer is 381.2 kg hm^-2.更多还原