What time should tomatoes be fertilized?

Tomato fertilization can be based on the characteristics of tomato fertilizer needs, tomato fertilization under the premise of cultivating strong seedlings, based on the base fertilizer, combined with land preparation 5 ~ 7 tons of high-quality organic fertilizer per mu, and with phosphorus fertilizer 6 ~ 8 kg, potash 7 ~ 10 kg.

Tomatoes are given a “seedling promotion fertilizer” 5-6 days after planting, with 2-3 kg of nitrogen fertilizer (urea) per mu.

When tomato spikes begin to expand, a “fruiting fertilizer” is applied with 3-4 kg of nitrogen (urea) per mu.

When the tomatoes enter the fruiting stage, when the spikes of fruit are white and the second and third spikes of fruit are rapidly expanding, fertilizer should be applied 2~3 times, each time with 3~4 kg of nitrogen (urea) per mu, and the previous time with 1.5~2 kg of phosphorus and potassium respectively, to help improve the fruit quality.

After tomatoes enter into full fruit, the root system’s ability to absorb fertilizer decreases and foliar sprays such as 0.3%~0.5% urea, 0.5% potassium phosphate and 0.1% borax can be applied to help delay aging and increase the harvesting period.

For fertilization of tomatoes under protected cultivation, it is important to prevent salinity disorders caused by excessive fertilization. Fertilization should increase the input of organic fertilizers, the amount of chemical fertilizers can be reduced by 20%-30% compared to the open field, and it is advisable to apply a small number of times, and pay attention to the need for timely irrigation and salt pressure to promote the growth and development of tomato.

Fertilization rules for tomatoes

Tomatoes have a long growth period and are characterized by fruiting while harvesting. It was determined that for every 1000 kg of tomatoes produced, 2.2 to 3.5 kg of nitrogen, 0.5 to 0.9 kg of phosphorus, 4.2 to 4.8 kg of potassium, 1.6 to 2.1 kg of calcium, and 0.3 to 0.6 kg of magnesium need to be absorbed. From the point of view of tomato nutrient needs, the need for potassium is particularly high, and attention should be paid to the application of potassium fertilizer when fertilizing. The nutrient requirements of tomatoes vary according to the reproductive period. From planting to the end of harvest, nitrogen uptake generally follows a linear trend, but absorption increases rapidly from the beginning of the fruit expansion period, after which the absorption rate increases and nitrogen uptake increases sharply, often easily causing nitrogen deficiency affecting fruit expansion. Phosphorus and magnesium uptake, with fruit expansion and increased uptake. Potassium absorption, since the beginning of fruit expansion increased rapidly, to the peak of fruit expansion, its content is about double the nitrogen. Calcium uptake and nitrogen similar to the lack of calcium during fruit expansion, easy to make the fruit cord rot disease.

Post time: Jul-12-2022