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Nitrogen - crop nutrition and application

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" Print the page Plants deficient in nitrogen (N) are stunted with pale green or yellow lower leaves, often with reddish tints and produce grain with low protein levels... Older cropped soils have less ability to mineralise nitrogen due to depleted soil organic matter levels... Dry seasons have less fallow mineralisation of nitrogen, while good moisture and warm soils encourage more nitrogen to be mineralised high levels of surface stubble, particularly when combined with zero tillage, which initially increase the nitrogen demand of the crop as fallow mineralisation of nitrogen has not occurred waterlogging during the later part of the fallow or early cropping period, which causes leaching or demineralisation losses of soil nitrogen...