Micro-Scale Spatial Variability of Surface Soil pH Under Different Irrigation Methods in Greenhouse

Based on 6-years irrigation experiment in greenhouse,micro-scale spatial variability and the distribution of surface soil pH were analyzed by combining classical statistic method with geostatistic method with a small grid-sampling technique under three irrigation methods(furrow irrigation,drip irrigation and subsurface irrigation).The results indicated that,after 6-years irrigation,soil pH under furrow irrigation decreased significantly,soil pH(0～5cm) under furrow irrigation and drip irrigation were medium heterogeneity,and soil pH(5～10cm) of furrow irrigation and drip irrigation,soil pH(0～5,5～10cm) of subsurface irrigation which were weak heterogeneity.The supplying way and quantity of water by irrigation can affect the spatial variability of soil pH.