绿洲潮土上玉米施锌的增产效果和使用技术

我们就黑河流域绿洲潮土上玉米施锌的效果和技术，进行了多年的田间试验研究。结果表明：绿洲潮土上玉米施锌增产的主要原因是土壤有效锌含量低，施锌玉米籽粒增产量为34.3-74.2kg/亩，增产率为10.2-23.4%。并且，施锌增产率与土壤有效锌含量间呈幂函数曲线关系，即y=9.388x#+-1.908。施锌最有效的方法是锌浸种加叶面喷锌。并初步确定，土壤有效锌（DTPA-Zn）临界含量为1.00ppm。

THE EFFECT OF THE MAIZE YIELD-INCREASING BY THE APPLICATION OF ZN FERTILIZER AND THE USE TECHNIQUES IN THE FLUVIO-AQUIC OASIS SOILS

Field experiments of application of Zn to maize, which have been done on the fluvio-aquic oasis soils by the Heihe River valley in Gansu Province, showed that the mainreason of the effect of Zn fertilizer to maize is poor available-Zn in the soil. Humidi-fication and salinization of soil and low fertility soil can increase the effect of applica-tion of Zn. The grain yield of maize applied with Zn fertilizer increase as 34.3 kg to74.2 kg per mu (514.5 to 1113 kg/ha) and the percentage of increase production is 10.2%to 23.4%, net income 9.29-21.26 yuan per mu, about as 9-21 times as price of Zn input. The effective methods and dosage of application of Zn are: (1) seed fertilizer: appl-ying 1 kg to 2 kg of zinc sulphate per mu (15 to 30 kg/ha) to sowing furrows duringseeding; (2) spraying: spray 0.3% aqueous solution of zinc sulphate on the leaves surfacefor 2 to 3 times during 6 to 10 leaves of maize growing; (3) soaking seed and spraying:soak seed in 0.05% to 0.10% aqueous solution of zinc sulphate for 24 hours the sowing,then spray 0.3% aqueous solution of zinc sulphate on the leaves surface for 1 to 2 timesbefore earing male. According to the relationship between rate of increase production of maize and levelof available-Zn content, three grade of available-Zn (DTPA-Zn) content in the fluvio-aquic oasis soils been divided: below 0.68 ppm is very poor, 0.68-1.00 ppm is poor and1.00-1.40 ppm is middle. The critical content, based on the grade of available-Zn in thefluvio-aquic oasis soils is tentatively at 1.00 ppm.