When do tomatoes usually blossom and bear fruit? How to apply fertilizer during flowering and fruit hanging period? What are the symptoms and coping methods of lack of fat?

Tomatoes, that is, tomatoes, also known as persimmons, persimmons. Its body height is 0.6-2 meters, all viscous glandular hairs, have a strong smell, widely cultivated in the north and south of China. So when do tomatoes usually blossom and bear fruit? How to apply fertilizer during flowering and fruit hanging period? What are the symptoms and coping methods of lack of fat? According to Solanaceae data, tomato inflorescences are 2-5 cm long, often 3-7 flowers, calyx radiate, Corolla radiate, berries flat globular or nearly globose, fleshy and juicy, seeds yellow, flowering and fruiting in summer and autumn.

When do tomatoes usually blossom and bear fruit?

The growth and development cycle of tomato is the growth and development cycle from seed sowing and germination to the seed maturity of the first ear. It can be divided into four stages: germination stage, seedling stage, flowering and fruiting stage.

I. germination period

The period from seed germination to the emergence of the first true leaf from two cotyledons is the development period, which is usually 7 Murray for 9 days.

II. Seedling stage

The period from the appearance of the first true leaf to the appearance of large buds is the seedling stage. it generally takes about 50 days for seedlings at suitable temperature, 80 days in cold season and 40 days in high temperature season.

3. Flowering and fruiting period

During this period, it takes 30 days for 15 murmurs, and it takes a short time for precocious or high temperature cultivation, and vice versa.

IV. Fruiting period

From the fruit setting of the first inflorescence to the harvest of all the fruits, it takes 80 days in spring and from July to August in the solar greenhouse. Tomato fruit period is the time that needs the most nutrients and water, and it is also an important period of management.

Tomato (tomato) florescence, hang fruit period how to fertilize?

1. The absorption of nutrients by tomatoes increases with the advance of the growth period. The nutrient absorption was small in the early growth stage, and the nutrient absorption increased rapidly from the first inflorescence to 70% to 80% of the total absorption in the full fruit stage.

The absorption of nitrogen, phosphorus and potassium by tomato showed a linear upward trend, the absorption of potassium was nearly twice that of nitrogen, and the absorption of calcium was similar to that of nitrogen.

2. Base fertilizer tomato cultivation in open field should re-apply base fertilizer, that is, on the basis of organic fertilizer, 35 kg of phosphate and potassium nitrate fertilizer should be applied per mu.

Topdressing applied 20 kg nitrophosphate fertilizer per mu when the first ear was enlarged, and 20 kg nitrophosphate fertilizer per mu after the first ear was harvested. Spraying the mixture of 20% nitrophosphate, 1% potassium dihydrogen phosphate, 0.1% zinc sulfate and 0.25% boric acid every 7 to 10 days can significantly increase the yield and vitamin C content of Xihong city.

What are the symptoms and countermeasures of lack of fertilizer in tomato (tomato)?

1. Potassium deficiency: more potassium is needed in the process of tomato growth. When the potassium supply in the soil is insufficient, the development of the fruit is at the cost of damaging the leaves. Usually, when 3-4 ears are produced, the old leaves are deficient in potassium, and the symptoms are especially obvious. If the roots are developed, the symptoms appear later. Sometimes potassium is sufficient in the soil, but the root absorption capacity decreases in the middle and later stage, which can not provide enough potassium for fruit development and plant growth, and still shows the symptom of potassium deficiency when the fruit is mature. Therefore, when potash fertilizer is fully applied during cultivation, potash fertilizer is easy to volatilize and leach, so the combination of basal application, topdressing and foliar spraying should be adopted to ensure the supply of potassium in the middle and later stage.

2. Calcium deficiency: calcium deficiency in tomato can easily lead to navel rot, which is a typical physiological disease. Attention should be paid to scientific and balanced fertilization in production. In addition to applying sufficient mature organic fertilizer as base fertilizer, a certain amount of calcium superphosphate should be used to prevent soil calcium deficiency, while ploughing the land deeply, adopting plastic film mulching cultivation and timely watering, especially in the fruiting period, pay attention to the balanced supply of water, strictly prevent dry and wet, timely watering in case of high temperature and drought in flowering and fruiting period, pay attention to drainage after rain in rainy season, and apply nitrogen fertilizer steadily in the early growth period. Avoid excessive vegetative growth. In addition, the umbilical rotten fruit should be removed in time in the young fruit stage to ensure the healthy fruit growth.

3. Phosphorus deficiency: the lack of phosphorus in tomato seedling stage will make the plant grow slowly, the leaves turn purple, the movement of phosphorus in the soil is small, and a large amount of phosphorus is needed in the seedling stage. Phosphorus is easily fixed by soil colloid, so phosphate fertilizer can be mixed with mature organic fertilizer or concentrated in trenching, or granular phosphate fertilizer can be used to reduce its contact with soil. In the middle and later stage of tomato growth, phosphorus can be sprayed on the leaves to improve the utilization rate of phosphate fertilizer.

4. Iron deficiency: the demand of iron is small in tomato growth, but it still plays a very important role in tomato growth and development. When iron is insufficient, the leaves fade, but the veins including branchlets are still green. Alkaline soil hinders the absorption of iron by plants, so iron fertilizer should be applied, but it should not be excessive. Ferrous sulfate is generally used, with bottom application of 2-7.5 kg / mu and foliar spray of 0.2% 1% aqueous solution.

5. Zinc deficiency: zinc deficiency can make the leaves between the veins turn yellow, and develop into black spots or purple, zinc deficiency is serious, which can hinder plant growth. Plant growth period can be foliar spraying 0.02% zinc sulfate 0.1% aqueous solution prevention, can effectively prevent the occurrence of zinc deficiency.