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锌、锰肥在PH较高的土壤环境中,可溶态微量养分易变为难溶态,或被钙及粘粒所吸附不易为作物利用。这种固定作用降低了微肥的利用率。西北地区大部为石灰性土壤必须搞清这种固定的速度、数量、强度及其后效,以便制定出减免固定的有效措施。两年来,我们对锌、锰肥就上述问题进行了试验,为经济施肥提供了依据。一、试验土样与方法土壤为红油土,采自关中平原武功县渭河三级阶地。从剖面中选取两层,即中钙土壤(0～20厘米,含碳酸钙7.3％,有机质1.15％)及高钙土壤(160～200厘米,碳酸钙16％,有机质0.41％)。将土样过筛采用盆培法。锌试验用塑料盆,每盆装土3公斤;锰用瓷盆,每盆装6.5公斤。分别用硫酸锌和硫酸锰溶液与土壤拌匀。
Zinc and manganese fertilizers in high pH soil environment, soluble micro-nutrients become easily dissolved state, or by calcium and clay adsorption is not easy for crop utilization. This fixing reduces the availability of micronutrients. Most of the northwestern calcareous soil must find out the fixed speed, quantity, intensity and its aftermath, in order to formulate effective measures for relief. In the past two years, we conducted experiments on the above problems with zinc and manganese fertilizers, which provided the basis for economic fertilization. First, the test soil samples and methods The soil is red oil soil, taken from the Guanzhong Plain Wugong County Weihe River terraces. Two layers were selected from the profile, that is, medium calcium soil (0-20 cm, calcium carbonate 7.3%, organic matter 1.15%) and high calcium soil (160-200 cm, calcium carbonate 16%, organic matter 0.41%). The soil samples were sieved pot cultivation method. Zinc plastic test pots, soil 3 kg per pot; manganese pots, each pot 6.5 kg. Respectively with zinc sulfate and manganese sulfate solution and soil mix well.