Phosphorus contents in the rhizosphere and bulk soil under Amorpha fruticosa established in different years Soil pH buffer capacity of tea garden with different planting years. Characteristics and evolution of soil nutrients in apple orchards at the gully region of Loess Plateau Concentration and speciation of arsenic in greenhouse vegetable soil in Shouguang County of Shandong Province. Effects of planting years of vegetable solar greenhouse on soil microbial flora and enzyme activities. Biomass allocation and estimation model at different planting ages ofwine grape forest in east Helan Mountain