What is the reason why leaves turn yellow and how to treat them?

Causes and treatment methods of leaf yellowing: reasonable illumination, soil improvement, adjustment of watering or fertilization.

1, reasonable lighting

The yellow leaves of plants may be affected by light. Not only is there a lack of sunlight, but too much sunlight can also cause leaves to turn yellow and plants to weaken. Light can reasonably see light, shade-loving plants should avoid strong light, and light-loving plants should fully see light. Reasonable light energy can promote photosynthesis and make leaves green.

Step 2 improve the soil

Change the soil regularly at ordinary times, loosen the soil in time, keep the soil loose and breathable, and apply organic fertilizer in time when fertilizer is lacking. For acidophilic plants, ferrous phosphate solution can be irrigated to adjust the pH value.

3. Adjust watering or fertilization.

When plants grow and maintain, the application of water and fertilizer will affect their growth. Usually watering and fertilizing should be reasonable. When watering, it should be dry and wet. Apply fertilizer thinly and frequently. If you water too much, you should promptly promote the discharge of accumulated water. If there is too much fertilization, water it heavily or replace it directly.

Master the planting time

The time for planting trees in spring can generally be from soil thawing to germination, and the specific time for planting trees varies from tree to tree. The planting time should not only refer to the experience over the years, but also depend on the climate situation of that year, and should not be copied, especially the influence of warm winter and cold winter.

According to experience, the general principle is sooner rather than later. In North China, not earlier than the beginning of March and not later than the end of April. Planting should be arranged reasonably according to the germination time of seedlings in the morning and evening, that is, the agricultural proverb says, "When planting trees, as long as you don't know the quantity."

Such as peach, plum, begonia, begonia, cherry, apricot, Luan tree, bauhinia, poplar, willow, crape myrtle, forsythia, spring jasmine, rose and so on. , should be planted in early spring, and ash, persimmon, Euonymus japonicus, Magnolia grandiflora, Pearl Plum, Sophora japonica, Elm, Jujube and Sophora japonica, etc. In the future, you should plant needles.