Cause of yellowing

1. Self-growth: If the new roots are re-growed at the bottom of the leaf stalk, and the spinach leaves turn yellow, this is metabolism, so don't worry.

2. Planting soil: If the spinach leaves do not re-grow new roots from the bottom layer of the leafhopper and cause yellowing, it is mostly due to poor soil quality and poor gas permeability, resulting in poor growth of spinach yellow leaves.

3. Fertilization problem: When spinach is planted, a large amount of nitrogen, phosphorus and potassium fertilizer elements are needed. The ratio of NPK is 2:1:3, which can be combined with some iron, zinc, manganese and boron microelements.

4. Watering: During the process of planting spinach, if the amount of watering is too large, the roots of spinach will grow poorly and the leaves will turn yellow.

Prevention

1. Agricultural measures: When planting, choose disease-free seeds, and hang some silver-gray film in the field to drive the mites. Keep the surface of the land clean and remove the weeds in time. Choose a well-ventilated terrain when planting, and water the spinach in times of drought. At the same time, the application of phosphorus and potassium fertilizer can improve the disease resistance of spinach.

2. Chemical control: In the early stage of yellowing of the leaves, some phytopathogenic emulsions or anti-toxic agents can be sprayed. For downy mildew and anthracnose of spinach, it can be sprayed with 75% chlorothalonil 600 times solution, 25% metalaxyl seven hundred times solution, 40% ethyl phosphorus aluminum wettable powder three hundred times solution, etc. in the initial stage.

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