The causes of yellowing of spinach leaves and its control methods

Spinach is one of the most common vegetables, originated in Iran, its body is rich in carotene, vitamins and other nutrients, high nutritional value. Spinach is planted in most parts of our country, which is relatively cold-resistant and adaptable, but many farmers who have planted spinach have encountered the sight that spinach plants begin to yellowing leaves. How is this going on? The following pro-agricultural network will introduce the reasons for the yellowing of spinach leaves and the corresponding prevention and control measures.

The reason for the yellowing of spinach leaves

There are four main reasons for the yellowing of spinach leaves, including normal metabolism, soil problems, fertilizer problems, water problems and so on.

1. Judging by normal growth, if the bottom leaves of spinach grow new roots from the axils of the leaves, then the yellowing of leaves is a normal phenomenon, which is the metabolism of spinach itself.

two。 Soil problems, if the axilla of spinach leaves do not grow new roots and the leaves turn yellow, it is mostly due to poor soil quality and poor air permeability, which leads to poor growth of spinach and yellow leaves. At this time, it is necessary to do a good job in soil renovation to increase air permeability.

3. In the problem of fertilization, the proportion of spinach to a large number of elements nitrogen, phosphorus and potassium is 2:1:3, which shows that it needs more nitrogen and potash fertilizer, but it can not increase the amount of fertilizer or apply some kind of fertilizer for high yield. in addition, yellow leaves, leaflets and soft rot will occur in the soil lacking iron, zinc, manganese, boron and other trace elements, which can be solved by spraying spinach foliar fertilizer in the later stage.

4. Too much water, too much spinach watering will cause root hypoxia leading to poor growth of yellow leaves, generally watering can be inserted into the soil with chopsticks to see whether the spinach root system is short of water, generally as long as it is wet, it is not necessary to water.

2. prevention and control measures of yellowing of spinach leaves

There are two main preventive measures for the yellowing of spinach leaves. Here, the pro-agriculture network asks you to make a brief introduction from the aspects of agriculture and medicine.

1. Agricultural measures: use seeds harvested from disease-free plants. Spread and hang silver gray film strips in the field to ward off aphids. Clean the countryside in time, eradicate weeds in the field, and uproot diseased plants in time. Choose the plot with good ventilation and far away from radish and cucumber. Sow seeds at the right time to avoid being too early. In case of spring drought or autumn drought, more watering can reduce the incidence of disease. Apply enough organic fertilizer and increase phosphorus and potassium fertilizer to enhance the disease resistance of the host. It is necessary to control aphids at seedling stage, especially before winter.

two。 Medicament prevention and cure: spray 1.5% Zhixianling emulsion 1000 times liquid, or 0.5% antivirus agent 1 water agent 1000 times liquid and so on at the initial stage of the disease. Downy mildew and anthracnose can be prevented by spraying 75% chlorothalonil 600 times, 25% metalaxyl 700 times and 40% aluminum ethyl phosphate wettable powder 300 times at the initial stage of the disease. In addition to crop rotation, virus diseases should also be controlled in time, such as aphids. During the peak period of aphids, 2000 times of imidacloprid or 3000 times of imidacloprid can be used to control aphids.

The above are the reasons for the yellowing of spinach leaves and the relevant prevention and control methods. after we find the yellowing of spinach leaves, we should take the initiative to find the causes, and then adopt corresponding prevention and control measures to implement the concept of "prevention first, treatment as a supplement." produce healthy and high-quality spinach varieties.