Fertilizer Management Techniques for Tomato

(1) Fertilization at Seedling Stage When the soil nitrogen (N) content is less than 30 mg/kg and the phosphorus (P) content is less than 20 mg/kg, the tomato seedlings grow slowly and weaken. Therefore, nurturing strong seedlings is the basis for high yields in tomatoes. Generally, 10 to 15 days before sowing, 100-150 kilograms of fully-composed and chopped mixed manure is applied to the 11-m2 ravioli, and phosphorus is added to 0.15-0.23 kg (corresponding to the general calcium phosphate 1.3-2. Kilograms or 0.3-0.5 kg of superphosphate. In addition, 0.15-0.17 kg of potassium (corresponding to about 0.3 kg of potassium sulfate) should also be incorporated, and be thoroughly mixed with the soil. It is also possible to apply nitrogen, phosphorous and potassium (15:15:15) compound fertilizer 1 kilograms to the soil before seeding and mix it with soil, which has a good effect on promoting strong seedlings, improving fruit setting and yield.

If nutritious nuggets or nurseries are used to grow seedlings, there will be less root damage during transplanting and a shorter seedling period will increase the yield in the early stage. Cultivation of soil preparation, selection of 50% to 60% of peat, horse manure 25% to 30%, 15% to 20% of field soil, or 20% to 30% of peat, manure 20% to 30%, 50% of garden soil 60%, fully mix and fill in the seedbed, spray water, cut into pieces, or install seedlings for future use.

(2) Reapplying the rotting fertilizer before colonization before planting and applying 75-105 tons of high-quality farmyard manure per hectare; 90-120 kg of phosphorus, equivalent to 750-975 kg of calcium phosphate or 195-255 kg of heavy calcium; potassium 112.5 -150 kg, equivalent to 225-300 kg of potassium sulfate. Applying phosphorus and potassium fertilizers on the basis of applying nitrogen fertilizer can achieve significant yield increase.

(3) Top dressing after planting

1 Seedling-emergence fertilizer: When planting and pouring the second time of seedling-watering, it can recover 7,500 kg of diluted fecal water per hectare or topdressing nitrogen (N) 15-30 kg, equivalent to 30-60 kg of urea or 70.5-142.5 of ammonium sulfate. Kg or ammonium nitrate 43.5-87 kg. In the case of low soil fertility and insufficient base fertilizer, it is very important to revive seedlings.

2 promote fruit fertilizer: When the first fruit begins to expand, combined with irrigation and chase fertilizer, this fertilizer accounts for 30% to 40% of the total fertilizer, generally 750-1500kg of manure per hectare, or nitrogen (N) 45-60 kg, equivalent to 90-135 kg of urea or 210-285 kg of ammonium sulfate. Do not use ammonium nitrate as a top dressing afterwards to reduce nitrogen leaching and nitrate accumulation in fruits.

3Following fertilizer in the full fruit period: When the tomato enters the full fruit period, the amount of vegetative bodies and fruits will increase rapidly. If the fertilizer is insufficient during this period, it will cause premature plant failure, fruit development is not full, the flesh is thin, and the quality is poor. Generally during the period from the first white fruit to the third fruit rapid expansion, top dressing 2-3 times. Nitrogen (N) 75-150 kg is applied per hectare, equivalent to 165-330 kg of urea or 357-714 kg of ammonium sulfate. In addition, pesticides can be sprayed with 0.3% to 0.5% of urea, 0.5% of potassium dihydrogen phosphate, and 0.5% to 0.8% of calcium nitrate 2-3 times, which is beneficial for maintaining the later yield and reducing fruit diseases.

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