Why can vegetable deficiency occur when more fertilizer is applied in gardening? Growers: two issues to pay attention to.
When planting tomatoes, cucumbers, peppers and other vegetables, many farmers often see the new leaves turn yellow. I don't know what the reason is? In fact, after careful observation, nine times out of ten is the yellow leaf caused by lack of elements. When planting vegetables, many farmers do not have a comprehensive understanding of medium and trace elements, and there are misunderstandings in fertilization, resulting in the symptoms of lack of nutrients.
- Why do you often lack medium and trace elements?
Many farmers often have doubts that vegetables need a lot of nitrogen, phosphorus and potassium for growth, and there is little lack of nitrogen, phosphorus and potassium. Why do you often have the symptoms of lack of elements when you use less medium and trace elements and get fat? When vegetables are lack of nitrogen, phosphorus and potassium, the old leaves at the lower part are generally yellow and lack medium and trace elements, and the yellow leaves are from the position of the growth point.
Now farmers do not look at the formula when applying fertilizer, and casually buy water-soluble fertilizer, which is more convenient to use. However, the nutrient elements contained in water-soluble fertilizer are incomplete, including nitrogen, phosphorus, potassium and some trace elements. For example, there may be only twoorthree of the seven or eight trace elements required for vegetable growth in water-soluble fertilizer. If the remaining elements are not supplemented, there will be a lack of elements. The content of nitrogen, phosphorus and potassium in water-soluble fertilizer is high, which can fully meet the needs of vegetable growth. Therefore, we see that there are many lack of medium and trace elements.
- Why is the effect of foliar fertilizer spraying bad?
Many farmers think that spraying medium and trace element fertilizer on the leaf is better than applying fertilizer on the root, which can reduce fertilizer waste, and can also be sprayed with pesticides, saving money and labor. The important thing is that excessive fertilizer will not cause damage to the root system. However, the nutrients absorbed by the leaves are limited. Spraying fertilizer on the leaves can only alleviate the symptoms of lack of nutrients, and cannot replace fertilization on the roots. For example, when growing melon, the amount of calcium exceeds that of phosphorus. If only spraying on the leaf surface and using 30 grams of water in a bucket, it is difficult to meet the demand for calcium.
Unreasonable fertilization methods lead to poor growth and low quality of vegetables, which is also the reason why many farmers say that applying a lot of fertilizer is still lack of vegetables. When farmers grow vegetables, they must pay attention to two issues and do a good job in fertilization management.
First, when applying fertilizer, it is necessary to apply fertilizer in a balanced manner. The types of trace elements in the water-soluble fertilizer used should be complete, and there should be no reaction between the elements. Especially for soilless vegetables, special fertilizers are generally used instead of ordinary water-soluble fertilizers. If the fertilizer used contains less trace elements, it should be combined with chelated trace element fertilizer when applying fertilizer.
Second, the nutrition required for vegetable growth mainly comes from the absorption of roots. Fertilization should be based on root fertilization, supplemented by foliar spraying. For example, trace elements in calcium and magnesium. In the early stage of vegetable growth, the amount of fertilizer should not be too much to prevent root injury. The rest can be sprayed on the leaves. The combination of the two methods can prevent element deficiency.