陕西省主要土壤养分有效性的研究

应用化学分析、吸附反应和生物诊断的方法,系统研究了陕西省关中土娄土、汉中水稻土、渭北黑垆土、陕北黄绵土和秦巴山区黄泥巴等5种主要土壤养分的丰缺状况,确定了供试土壤的养分限制因子。结果表明,5种主要土壤普遍缺P和N,部分土壤中K,S,Cu,Zn供应不足,水稻土含B量极低。各养分含量与吸附量均呈极显著的直线相关,除水稻土外,土壤对Cu,Mn,Zn的吸附因土壤差异较大。生物学试验结果表明,OPT的估计是合理的,作物生长情况与化学分析结果和吸附试验相吻合。

The adsorption characteristic and biological availability of soil nutrients in Shaanxi

Chemical analysis,adsorptive reaction and biological diagnosis were systematically employed to study the status of nutrients in five soils to determine the demanding order for fertilizers.The results showed that N and P deficiency widely existed in the soils,followed by K,S,Cu,Zn deficiency,and B in paddy soil.The added concentration nutrients and adsorptive amount had a good correlation among all test elelments and test soils.Except paddy soils,Cu,Zn,Mn adsorption rates were not effected by soils.P.S.and B adsorption differed among the five soils.Biological diagnosis tests showed that OPT was reasonable to some extent.Crop growth was identical with the results of chemical analysis and adsorption tests.