Disturbance of site preparation on chemical properties of calcic horizon in chestnut soil Characteristics ofmicrobes in loamy meadow chestnut soil planted with naked oats using different tillage methods The decomposition of organic matter and the change of available nutrient in chestnut soil of Hebei Province The yield responses of naked oats to phosphorus fertilizer and phosphorus behavior in chestnut soil in a long-term experiment A FIELD RESEARCH ON THE EFFECT OF WATER FERTILIZER COUPLING IN CHESTNUT SOIL