Kinds of FertilizersThe most important potassium fertilizers are shown in Table 4.9 (15). Two major groups may be distinguished, the chlorides and the sulfates. The latter are more expensive than the chlorides. For this reason, the chlorides are preferred, provided that the crop is not chlorophobic. Most field crops are not sensitive to chloride and should therefore be fertilized with potassium chloride (muriate of potash). Oil palm (Elaeis guineensis Jacq.) and coconut (Cocos nucifera L.) have a specific chloride requirement, with Cl functioning as a kind of plant nutrient because of its osmotic effect (110).
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