福建耕地土壤硫肥效应及其临界指标研究

Effectivness and Critical Index of Sulfur Fertilizer in Cultivated Soils in Fujian Province

硫是作物生长发育所需的营养元素。根据多年多点田间试验和土壤有效硫测定,研究福建主要粮经作物的硫肥效应、土壤有效硫临界指标和耕地土壤硫肥力状况。64个田间试验表明,福建主要农作物施用硫肥平均增产10.5%,增产幅度是旱作物>水稻>香蕉;水田土壤和旱地土壤有效硫临界指标分别为23mgkg-1和25mgkg-1。根据全省372个耕层土样有效硫测定结果,土壤有效硫含量平均为27.6mgkg-1,低于土壤有效硫临界值的样品数占57.0%,其中,闽东南地区耕地土壤有效硫缺乏程度比闽西北地区高;在土地不同利用类型中,旱地土壤有效硫总体比水田匮乏,旱地土壤有效硫平均含量是茶果园>菜园>农地,其中,农地土壤有效硫低于临界指标的样品占75.3%;水田中不同土种的土壤有效硫含量以埭田最高,灰沙泥田为最低,旱地则以灰赤土最高而风沙土最低。

Based on many field trials and soil available sulfur tested for years, the effectiveness of sulfur to main grain and economy crops was tested and soil available sulfur critical index was determined in cultivated soils in Fujian. The results obtained from 64 field trials showed that the yield increased 10.5% of in main crops as sulfur was applied （dryland crop 〉 rice 〉 banana）. Soil available sulfur critical indices of paddy and dryland soils were 23mg kg^-1 and 25mg kg^-1 respectively. Average available sulfur was 27.6mg kg^-1 in 372 cultivated soil samples 57.0% of soil samples were under the soil available sulfur critical index. Soil available sulfur in dryland normally was less than that in paddy field And 75.3% of the dryland soils were under critical index Soil available sulfur content of paddy soil in seashore was higher than that of gray sandy soil. Soil available sulfur content of gray red soil was higher than that of sandy soil in dryland.