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选用硫包膜、硫加树脂包膜和树脂包膜3种控释肥,研究在池栽培养下不同控释肥对土壤无机硫各组分的影响。结果表明:棕壤中无机硫存在形态主要以水溶性硫(H2O-S)和盐酸可溶性硫(HCl-S)为主;施用硫包膜和硫加树脂包膜控释肥可显著增加0-20 cm土层水溶性硫含量;在玉米生育期间土壤吸附态硫(Adsorbed-S)与水溶性硫之间相互转化并保持平衡;随着作物的吸收利用,土壤中无机硫总量处于逐渐下降的趋势,但硫加树脂包膜控释肥的施用增加了土壤中无机硫总量;在淋溶作用下SO42-有向土壤深层迁移的趋势。
Three controlled-release fertilizers, sulfur coating, resin-coated membrane and resin coated membrane, were selected to study the effects of different controlled-release fertilizers on inorganic sulfur fractions in soil. The results showed that the main forms of inorganic sulfur in brown soil were mainly H2O-S and HCl-S; the sulfur-coated and sulfur-coated resin controlled release fertilizers could increase 0-20 cm soil layer. During the growth of maize, Adsorbed-S and water-soluble sulfur were transformed into each other and maintained their balance. With the absorption and utilization of crops, the total amount of inorganic sulfur in soil decreased gradually However, the application of sulfur-plus-resin coated controlled release fertilizer increased the total amount of inorganic sulfur in the soil and the tendency of SO42-directed soil to migrate deeply under leaching.