Nutrient requirements of grapes
1. Grape should not only pay attention to the supplement of nitrogen, phosphorus and potassium, but also the supplement of calcium, magnesium, boron, zinc, iron and manganese;
2. The grape needs nitrogen in the early stage and potassium in the later stage. There should be a certain amount of phosphorus supply in the whole growth stage. Magnesium and calcium fertilizers are best used in the flowering or young fruit period, and trace elements should be sprayed many times in the growth stage.
3. The proportion of nutrients required by grape varies at different growing times.