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为获得珠江三角洲地区蔬菜中微量元素的合理用量,通过在2地进行3种蔬菜施镁、硼、钼的田间试验,研究三种元素不同配比对三种蔬菜的影响。结果显示:(1)不同品种的蔬菜对中微量元素的需求量不同;相同品种蔬菜在不同地点土壤上的施镁、硼、钼肥效应不同;相同蔬菜镁、硼、钼配施比单独使用的施用量可大幅度减少,尤其是硼和钼可减少50%。(2)在施氮磷钾基础上单独施用镁、硼、钼,菜心的Mg适施量约为13.350～15.750 kghm-2;B的适施量约为0.990～1.065 kghm-2;Mo的适施量为0.375～0.420 kg hm-2。蒜青的Mg适施量约为1.500 kg hm-2;B的适施量约为0.450 kg hm-2;Mo的适施量为0.240 kg hm-2。苦瓜的施硼适用量范围在1.050 kg hm-2左右。(3)在施氮磷钾基础上镁、硼、钼配合施用,菜心的Mg适施量约为12.000 kghm-2、B适施量约为0.450 kghm-2、Mo适施量约为0.240 kghm-2;苦瓜的Mg适施量约为12.000～18.000 kghm-2、B适施量约为0.450～1.800 kg hm-2、Mo适施量为0.120～0.240 kg hm-2;蒜青的B和Mo适用量分别为0.900 kg hm-2和0.210 kg hm-2、镁的施用量则应<1.350 kg hm-2。(4)镁和硼的施用量不仅受试验地土壤交换性镁和有效硼含量水平的影响,还与土壤pH值和蔬菜目标产量有关。
In order to obtain reasonable amount of trace elements in vegetables in the Pearl River Delta region, the effects of different proportions of three elements on three kinds of vegetables were studied through field experiments on three kinds of vegetables applying magnesium, boron and molybdenum in two places. The results showed that: (1) The demand of trace elements in different varieties of vegetables was different; the effect of applying magnesium, boron and molybdenum was different in the same variety of vegetables in different locations; Of the application rate can be significantly reduced, especially boron and molybdenum can be reduced by 50%. (2) The application rates of magnesium, boron and molybdenum alone were about 13.350 ~ 15.750 kghm-2 on the basis of applying N, P and K, while the suitable application rates of B were 0.990-1.065 kghm-2. The contents of Mo The application rate of 0.375 ~ 0.420 kg hm-2. Garlic Mg application rate is about 1.500 kg hm-2; B application rate is about 0.450 kg hm-2; Mo application rate of 0.240 kg hm-2. Balsam application of boron in the range of 1.050 kg hm-2 or so. (3) Applying magnesium, boron and molybdenum on the basis of N, P and K together, the suitable amount of Mg for flowering cabbage is about 12.000 kghm-2, the suitable dosage for B is about 0.450 kghm-2, the suitable dosage for Mo is about 0.240 kghm-2. The suitable dosage of Mg for bitter gourd is about 12.000 ~ 18.000 kghm-2, the suitable dosage of B is 0.450 ~ 1.800 kg hm-2, and the suitable dosage of Mo is 0.120 ~ 0.240 kg hm-2. And Mo applications were 0.900 kg hm-2 and 0.210 kg hm-2, respectively, and the application rate of magnesium should be <1.350 kg hm-2. (4) The application rates of magnesium and boron are not only affected by the level of soil exchangeable magnesium and available boron, but also with the soil pH and the target yield of vegetables.