What causes spinach leaves to turn yellow?

1. Causes of spinach leaves turning yellow

1. Its own growth: if new roots grow again from the base of the leaf axils, causing the spinach leaves to turn yellow, this is a very common phenomenon, biologically speaking it is metabolism, and there is no need to worry about this situation.

2. Planting soil: if the spinach leaves turn yellow not because new roots grow again from the base of the leaf axils, then it is mostly because the soil quality is poor, has poor air permeability, and so on, causing poor spinach growth and yellow leaves. At this time, the land must be renovated to increase the air permeability of the soil layer.

3: Fertilization problems: when planting spinach, a large amount of nitrogen, phosphorus and potassium fertilizer elements are needed, and the ratio of nitrogen, phosphorus and potassium elements is 2:1:3, but it is also not possible to apply only these three fertilizers; alternatively, some iron, zinc, manganese and boron microelements can be applied together into the soil, because if these are indeed lacking, they will also affect the spinach leaves and cause yellowing. In the later stage, some foliar fertilizer can also be sprayed on the spinach to increase nutrients and prevent the leaves from turning yellow.

4. Watering: during the process of planting spinach, if the amount of watering is too large, the spinach roots will grow poorly due to lack of oxygen and the leaves will therefore turn yellow. At this time, when watering, a chopstick can be inserted into the soil to see whether the spinach roots are lacking water. If the soil is in a moist state, there is no need to water again.

2. Prevention and control measures for spinach leaves turning yellow

1. Agricultural measures: when planting, choose seeds that are free of disease, and hang some silver-gray film in the field to drive away aphids. Keep the surface of the land clean, and promptly remove diseased plants and weeds. When planting, choose a terrain with good ventilation, and in dry seasons water the spinach, which can reduce spinach leaves turning yellow. Fertilization can be carried out, with increased application of phosphorus and potassium fertilizers, which can improve the disease resistance of spinach and make the spinach grow healthily.

2. Chemical control: in the early stage of leaf yellowing, some Zhibingling emulsion can be sprayed, or some antiviral agents can be sprayed. For spinach downy mildew and anthracnose, in the early stage, 75% chlorothalonil 600-fold solution, 25% metalaxyl 700-fold solution, 40% phosethyl-Al wettable powder 300-fold solution, etc. can be used for spray control.