Fertilization of autumn 茬 tomatoes to master these points, it is easy to raise the quality!

Tomatoes are a kind of solanaceous vegetables. They are warm and fat-resistant. They need different fertilizer levels at different stages, and the demand for autumn sorghum and spring sorghum tomatoes is different. Now it is the period of management of autumn 茬 tomatoes, then this article focuses on I introduce the cultivation of autumn sorghum and hope to help the growers.

Tomato needs fertilizer

According to statistics from various fields, for every 1000 kilograms of commercial tomatoes, nitrogen (N) 4.5 kg, phosphorus (P205) 0.15 kg, potassium (K20) 5.0 kg, and calcium oxide 2.52-4.19 kg are required. The order of absorption is potassium>nitrogen>calcium>magnesium>phosphorus. The absorption rate of N and KO is 40-50%, and the absorption rate of P2O5 is 20%. Therefore, the ratio of the three elements in fertilization should be It is 1:1:2.

Fertilization principle

(1) Rational application of organic fertilizer (recommended use of plant-derived organic compost) to adjust the amount of NPK fertilizer, non-calcium soil and acid soil need to supplement calcium, magnesium, boron and other trace elements;

(2) Rationally distribute chemical fertilizer according to crop yield, sorghum and soil fertility conditions, most of the phosphorus fertilizer application, nitrogen and potassium fertilizer application; it is not suitable for frequent topdressing in the early stage of growth, and pay attention to post-flowering and late-stage topdressing;

(3) Combined with drip fertigation technology, adopting the principle of “small number of times”;

(4) The old shed with soil degradation needs to return the straw to the field or apply the organic fertilizer with high C/N ratio, reduce the application of poultry manure, increase the number of rotations, and achieve the purpose of eliminating soil salinization and reducing the obstacles of continuous cropping;

(5) When the acidification of the soil is serious, an acidic soil conditioner such as lime should be applied in an appropriate amount.

Applying base fertilizer

The base fertilizer is cooked with high-quality organic fertilizer 700-1000 kg/mu, with potassium sulfate compound fertilizer 50-60 kg/mu; super-calcium phosphate 150 kg; zinc sulfate 1 kg/mu; borax 0.25 kg/mu. If the disease is severe or the pH is lower than 5.5, the appropriate amount of lime can be applied evenly and then tilled, and then fertilized for 3-5 days.

Reasonable topdressing

The first topdressing: After 15-20 days of transplanting, 20 kg of ammonium sulfate or 10 kg of urea per acre was applied to promote the growth of tomato plants, laying a foundation for the later results.

The second top dressing: When the first ear fruit begins to expand, 25-35 kg of ammonium sulfate or 10-15 kg of urea + 10 kg of potassium sulfate is applied, which lays the foundation for the result and harvest of the first tomato. It can achieve the effect of expanding fruit, increasing yield and enhancing stress resistance.

The third top dressing: in the middle and late stages of the fruit, depending on the growth of the plant and the soil fertilization status, 20-30 kg of ammonium sulfate or 10-15 kg of urea + 10 kg of potassium sulfate per acre per 10-15 days. Extending the results period will prevent early decay. Watering and topdressing, moderate tillage and soil cultivation can promote tomato root development.

In the case of soil potassium deficiency, the application of potassium fertilizer in the middle and late stages is important for the uniform coloration of tomato fruit, reduction of prismatic fruit and improvement of fruit quality.

Use of foliar fertilizer

With foliar fertilization, nutrients quickly enter the plant through the leaves, which can effectively solve the problem of lack of nutrients in tomatoes. Tomato has a large demand for calcium. It can be applied several times with calcium-containing foliar fertilizer, or calcium ammonium nitrate can be dissolved in water to prepare a 200-300 times solution for foliar application. Spraying potassium dihydrogen phosphate, nucleotides, amino acids, and chitin foliar fertilizers can not only supplement nutrients, but also improve stress resistance.

The above is about the introduction of autumn 茬 tomato fertilization, in order to ensure high yield during the tomato planting process, then the use of fertilizer must be at the bottom of the heart, can not be used blindly!

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