What is the yellowing of the latest tomato before it blooms?

September officially delays the critical period of tomato flowering and fruit setting, when there are fewer diseases and suitable temperature, which is the most suitable time of year for vegetables to grow. And many vegetable farmers react that the tomatoes in the shed have yellowed and fallen off before they bloom. How is this all the same? Come and have a look with the editor.

1. Bad weather at seedling stage

Autumn delayed tomato, the seedling stage is concentrated in July, but this summer there are more Rain Water and cloudy days, which makes the overall light of tomato seedling stage weak, high temperature and weak light will inevitably lead to weak tomato seedlings. Therefore, this year, tomato seedlings are generally weak, the seedlings are thin and weak, and the stress resistance is poor, but after planting, there are few cooling measures in the greenhouse, the temperature in the greenhouse is high, and many seedlings are scalded, leading to stunting and sprouting. And the emergence of adverse 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 shedding before flowering. High temperature and low light environment will lead to weakening of photosynthesis, less nutrient accumulation, plant thinness, 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, while many farmers apply a large number of chemical fertilizers, resulting in soil nutrition imbalance, increase soil salinization, some to the root system to absorb other elements. In addition, the unreasonable application of a large number of hormones can easily cause hormone imbalance in the plant and lead to plant growth disorder.

3. Improper fertilization

Base fertilizer is the key means of soil improvement. Many farmers use farm manure and compound fertilizer as base fertilizer, focusing on nitrogen, phosphorus, potassium and other fertilizers, but there are few supplements for trace elements such as calcium, magnesium, iron, zinc, boron and molybdenum. However, these trace elements are closely related to plant flower bud differentiation. The root system is weak at the seedling stage, and the application of a large amount of chemical fertilizer will cause difficulties in absorbing trace elements in the soil, thus affecting flower bud differentiation, and even flower bud abortion. Generally speaking, in addition to the application of rotten organic fertilizer, it is also necessary to match trace elements and turn them into the soil together with organic fertilizer to ensure the balance of soil nutrients.

The above tomato flowers are yellowing before the introduction, hope to help you, want to know more related knowledge, please follow us.