Tomato

1. Nutritional characteristics

The growth cycle of tomatoes takes about 110-170 days, and the development period is generally 7-9 days; The seedling stage generally takes about 50 days in the appropriate temperature, 60-80 days in the cold season, and 40 days in the high temperature season. The flowering and fruit-setting period takes 15-30 days, the time for early maturing or high temperature cultivation is short, and the other time is long; After flowering and pollination of tomatoes, the fruit begins to expand 3-4 days, the fastest 7-20 days, the expansion reaches the limit after 30 days, and the color begins to mature 40-50 days.

2, need fertilizer characteristics

Tomatoes need to absorb a lot of nutrients from the soil during the whole growth period, with the most potassium, followed by nitrogen and less phosphorus. For every 1000kg of tomatoes produced, 7.8kg of pure nitrogen (N), 1.3kg of phosphorus (P2O5) and 15.9kg of potassium (K2O) are required.

The main nitrogen and phosphorus elements in tomato seedling stage promoted the expansion of leaf area and flower bud differentiation. Nitrogen and potassium nutrition should be gradually increased during flowering. Results In the peak period, adequate nitrogen and potassium nutrition should be ensured to promote fruit expansion, increase fruit resistance and quality.

Tomatoes have large requirements for trace elements in calcium and magnesium, and are more sensitive to iron, manganese and zinc deficiency. Calcin can improve the cracking resistance of tomato fruits and prevent the occurrence of a large number of fruit omphalic rot. Magnesium, iron, manganese and zinc deficiency will cause different degrees of leaf yellowness, which has a great impact on fruit quality. (Taken from the network, if there is infringement, please contact to delete.)

3. Fertilization technology

Base fertilizer: Suitable to apply 6% organic fertilizer (1-1-4, 45) 100kg+ suitable to apply 40% special sulfur potassium fertilizer (16-8-16) 90-110kg; Or it is appropriate to apply 15% full biological organic fertilizer (9-2-4, 25) 50kg+ it is appropriate to apply 40% special sulfur potassium fertilizer (16-8-16) 90-100kg.

Topdressing: In the first panicle expansion stage, apply the special fertilizer of 40% potassium sulphate (16-8-16) 10kg; The second panicle fruit expansion stage was followed by Yishuzhuang 40% potassium sulfur fertilizer (16-8-16) 20kg; At the third panicle expansion stage, we followed up with a special fertilizer (16-8-16) of 40% potassium sulphate type (10kg).

Spreading should be combined with ploughing into the soil or furrow or hole covering.