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available nitrogen supply

Catalogue: Ground Cover
Dr Schoenau discussed his studies, which took place in a climate of semi-arid to sub-humid climate with 300 to 400 millimetres of annual rainfall, at the South Australian No-Till Farmers Association"s annual conference... Over the long term, the increased surface residue cover was shown to protect the soil from nutrient losses caused by soil erosion... "Greater water retention under no-till treatments resulted in the soil being saturated for longer and more nitrogen was lost due to de-nitrification, while the higher soil moisture improved phosphorus availability by allowing greater movement of phosphate to root surfaces."..
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