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Effect of long-term K application on corn yield and potassium forms in plough layer of black soil and meadow soil in northeast of China Effects of long-term phosphorus fertilization on quality and starch RVA characters in sweetpotato Effects of long-term mixed application of organic manure and chemical fertilizers on farmland weed soil seedbank Effects of a long-term located fertilization on soil quality of grey desert soil Effects of long-term located fertilization on the a vailable boron content of soil Study on the enzyme activities and fertility change of soils by a long-term located utilization of different fertilizers The change of the weed biodiversity in wheat field under a long-term located fertilization Influence of long-term fertilization on phosphorus fertility of calcareous soil Ⅱ.Inorganic and organic phosphorus. Effects of long-term organic and inorganic fertilizer combined application on weed growth dynamic in paddy field Effect of long-term single application of chemical fertilizer on soil properties and crop yield EFFECTS OF LONG-TERM LOCATED FERTILIZATION ON SOIL ENZYMATIC ACTIVITIES FOR WHEAT-MAIZE INTERCROPPING IN IRRIGATED DESERT SOILS Fertilizer Efficiency and Soil Apparent Nutrient Balance for Barley under Long-Term Fertilization Inorganic phosphorus in a regosol (purple) soil under long-term phosphorus fertilization Effects of a long-term located fertilization on enzyme activity of the non-calcareous fluro-aquic soil