Interaction of Zinc with Other Nutrients

摘要

Apart from direct role of micromitrients fertiliser in overcoming inherent deficiency and enhancing response to NPK. fertilisers, they also assert an interactive effect on the uptake and use of other nutrients. Understanding of zinc interactions with other nutrients are important for balancing nutrient supply, improving growth and yields, and eliminating deficiencies and toxicities imposed on plants. However, some progress has been made in this direction, but in field crops, the application of zinc is still often an adhoc recommendation with no sound information on how zinc interactions are ikely to affect the outcome. This paper describes the mechanisms and causes of Zn interactions with macro and micronutrients. There was consistency in Zn x N and Zn x K interaction indicating a positive relationship with each other. In earlier studies, the cause of Zn interaction was suspected to be the formation of an insoluble Zn3 (PO4)2 in soil which reduced the concentrations of Zn in solution to the deficiency level due to heavy P fertilisation. But the hypothesis of formation of insoluble Zn3 (PO4)2 appears as invalid on various grounds. The antagonism between P and Zn in soil can be avoided by applying Zn carrier. However, in plant Zn x P interaction was either positive or negative. High levels of P or Zn may reduce their uptakes in plants. Higher levels of Ca, Mg and Na inhibit absorption and translocation of Zn in crops. The effect of Zn on Ca and Mg was antagonistic. ZnxFe, ZnxCu and ZnxMn behave antagonistically. High B supples resulted in low uptake of Zn and Zn deficiency enhanced B accumulation. The relationship between Mo x Zn and Zn x S is antagonistic.