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SPATIAL VARIABILITY AND INFLUENCING FACTORS OF SOIL AVAILABLE SECONDARY ELEMENTS IN QUJING TOBACCO AREA, CHINA EFFECT OF SILICON FERTILIZATION ON MAO BAMBOO STANDS Applications and establishment of available substance(energy、money)balanced model in a social-economic-natural complex ecosystem Accumulation of available sulfur in soil profile and affecting factors in a long-term fertilizer experiment of dry land farming Study on test methods for soil available S and critical levels of S deficiency DYNAMICS OF SOIL AVAILABLE S IN WHEAT MAIZE ROTATION OF BEIJING Effect of Incorporation of Alum Plasma on Phosphorus Immobilization of Paddy Soil, and Growth, Yield of Rice Effects of Soil Se Levels and Se Application on Se Content, Antioxidative Responses and Biomass Accumulation of Rice Geographic Distribution and Content of Available Silicon in Soils under Ph. Pubescens Stands in Zhejiang and Fujian Province Status and dynamics of China‘s lake water regulation Cr AVAILABILITY IN SOILS AND ITS EFFECTS ON POLLUTION ECOLOGY Effects of soil available silicon on growth,development and physiological functions of soybean State of soil available sulphur and its requirement along Huaihe River region Spatial heterogeneity of available soil nutrients in abandoned ole-field communities in the Loess Hilly Region Effect of Available Silicon in Soil on Cucumber Seed Germination and SeedlingGrowth Metabolism Effect of Available Silicon in Soil on Cucumber Seed Germination and SeedlingGrowth Metabolism The effect of limited water supply on root growth and soil water use of winter wheat