What are the key points of planting tomato seedlings? Why is there yellowing?

Tomatoes, also known as tomatoes, are usually on the market in summer and autumn. With the development of planting technology, they can be eaten all the year round. Tomatoes are very popular with consumers because of their bright color, peculiar taste and rich nutrients. Tomatoes are planted in many places in our country, so what are the key points of planting tomato seedlings? Why is there yellowing?

What are the main points of planting tomato seedlings?

The tomato seedlings purchased must do a good job of slowing down the seedlings. First water a certain amount of water, block in a cool place, wait until the temperature reaches about 20 degrees Celsius, you can transplant. When tomato seedlings are transplanted, the soil should be ploughed deeply, and organic fertilizer or nitrogen, phosphorus and potassium fertilizer can be added appropriately.

Tomato seedlings will be planted at an interval of about 40 centimeters. When planting, we should pay attention to the depth of the root transplanting to the new planting hole, and the depth of the planting hole should be kept at about 10 centimeters. When the tomato seedlings have finished transplanting, they should be watered for the first time. Pay attention to the follow-up management process to keep the soil moist and dry, do not appear stagnant water phenomenon, otherwise it will have a serious impact on plant growth.

Tomato seedlings during transplanting should pay attention to temperature changes, the temperature is too high easy to sunburn seedlings, it is best to find a breathable cloth to cover, otherwise it is easy to be covered to death.

Second, why do tomato seedlings turn yellow?

Tomato seedlings yellowing phenomenon is likely to be caused by the lack of trace elements, which is the lack of which should be analyzed according to the location and symptoms of tomato seedlings yellowing.

If it is iron deficiency yellowing, then the general tip leaves will appear yellowing, and then slowly develop downward, resulting in mild tissue necrosis.

The typical phenomenon of tomato seedlings yellowing due to lack of boron is that the leaves lose green to yellow or orange-red, and slowly turn black. If the disease is serious, the whole plant leaves will wither and die. In addition, boron deficiency will also lead to leaf curl, poor growth, fruit deformity and so on.

If the tomato seedlings are short of zinc and yellow, then start with the thinning of the top leaves and the fading of the veins, the old leaves will not lose green, but there are brown spots. Generally, if zinc deficiency occurs, the tomato seedlings will wither and fall off within a few days.

When tomato seedlings are short of molybdenum, the old leaves fade green at first, the mesophyll between the edges and veins of the leaves appears yellow spots, the edges of the leaves roll up, the tip of the leaves become scorched, and gradually move inward. If the phenomenon is mild, it will affect the quantity and quality of blossom and fruit, and in serious cases, the whole plant will die. The impact on growers is very great, so we must pay attention to it.