What is the first tomato flower to yellow?

September officially delayed the key period of tomato flowering and fruiting in autumn, when there were fewer diseases and the temperature was suitable, which was the most suitable period for vegetables to grow in the year. And a lot of vegetable farmer reaction shed tomatoes have not yet blossomed has yellowed off, this is how to return a responsibility? Let's take a look at it together with Xiaobian.

1. Poor weather at seedling stage

Autumn delay tomato, seedling period concentrated in July, and this summer more rain, cloudy days, so that tomato seedling overall light is weak, high temperature and weak light will inevitably lead to tomato seedlings thin and weak. Therefore, tomato seedlings are generally weak this year, seedlings are thin and weak, and stress resistance is poor. After planting, greenhouse cooling measures are few, greenhouse temperature is high, many seedlings are scalded, and the problem of dormancy is induced. Moreover, the appearance of harsh environment will induce vegetables to produce ethylene and other substances, which will accelerate the aging and shedding of leaves and flowers, so tomatoes have yellowed before flowering.

2. Poor flower bud differentiation

Poor flower bud differentiation is also one of the main reasons for yellowing and falling before flowering. High temperature and weak light environment will lead to weak photosynthesis, less nutrient accumulation, weak plants, flower bud abortion and flower drop. Water and fertilizer conditions have a great impact on flower bud differentiation, many elements play an indispensable role in flower bud differentiation, and many farmers apply large amounts of chemical fertilizers, resulting in soil nutrition imbalance, increasing soil salinity, some to the root system to absorb other elements. In addition, unreasonable application of a large number of hormones can easily cause hormone imbalance in plants, resulting in plant growth disorder.

3. Improper fertilization

Base fertilizer is the key means to improve soil. Many farmers apply farm manure and compound fertilizer as base fertilizer, focusing on nitrogen, phosphorus and potassium fertilizers, but the supplement of trace elements such as calcium, magnesium, iron, zinc, boron and molybdenum is very small, but these trace elements are closely related to flower bud differentiation of plants. Seedling root system is weak, a large amount of chemical fertilizer will cause difficulty in the absorption of trace elements in the soil, thus affecting flower bud differentiation, even flower bud abortion and flower drop. Generally speaking, in addition to applying decomposed organic fertilizer, trace elements should be matched and turned into the soil together with organic fertilizer to ensure soil nutrient balance.

The above tomato flower is not open first yellowing is what is going on, I hope to help you, want to know more related knowledge, please pay attention to us.