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SOIL STRUCTURE AND POTASSIUM SUPPLY .2. THE EFFECT OF PED SIZE AND ROOT DENSITY ON THE SUPPLY TO PLANTS OF EXCHANGEABLE AND NON-EXCHANGEABLE POTASSIUM FROM A CHALKY BOULDER CLAY SOIL
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PLANT UPTAKE OF EXCHANGEABLE AND NONEXCHANGEABLE POTASSIUM .1. MEASUREMENT AND MODELING FOR ONION ROOTS IN A CHALKY BOULDER CLAY SOIL
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AVAILABILITY OF POTASSIUM TO RYEGRASS FROM SCOTTISH SOILS .1. EFFECTS OF INTENSIVE CROPPING ON POTASSIUM PARAMETERS
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