![]() ![]() The elemental form of S must be oxidized to the sulphate form before it is available to the crop. Ammonium sulphate supplies a readily available form of sulphate. Plants take up S in the sulphate form (SO4=). When soil testing information is not available and the soil is thought to be marginally deficient in S, N and S should be added in a ratio of 7:1 for canola and 10:1 for wheat. The ratio in the soil should always be lower than that required by the plant to ensure adequate N:S ratios in the plant.Ī soil and plant tissue analysis will help identify the need for additional S and the rate required. To obtain the optimal plant N:S ratios, soil N:S ratios should be between 5:1 and 10:1, depending upon the crop grown. N:S BALANCEĭepending on the crop and its growth stage, optimal nitrogen (N) to sulphur (N:S) ratios range between 7:1 and 15:1. Deficiencies are also noted on soils with a relatively long history of canola or alfalfa production in the rotation. Generally, S deficiencies occur on soils that are coarse textured (sandy), well drained and/or low in organic matter. In canola, the leaves may cup inwards and develop a reddish or pink colouration on the underside of the leaf. Typically, S deficient crops are spindly, later maturing and the younger leaves are pale green to yellow in colour. Critical to growth, S plays a major role in the formation of proteins, enzymes, chlorophyll and effective nodulation. It is often forgotten in the fertility program, yet most crops utilize as much S as phosphorus. Sulphur (S) is considered to be the fourth major nutrient required by plants. ![]()
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