Adjust the temperature
Before tomatoes set fruit, the temperature is 26-28 degrees during the day and 10- 12 degrees at night. Keep the temperature during the day and lower it at night, otherwise it will easily lead to lush plants.
It is suggested that the daytime temperature should be controlled at 26-32 degrees, at night at 16-20 degrees, and the temperature difference between day and night should be above 10 degrees.
liquid manure
Generally, tomatoes do not need topdressing before the first ear. After the first ear of tomato is set and the young fruit begins to swell, topdressing management should be carried out once.
Fertilizers with high nitrogen, low phosphorus and medium potassium can be applied 1 time, and the contents of nitrogen, phosphorus and potassium should be controlled at 15%, 5% and 10% respectively.
After the second ear is filled and swollen, water it alternately. After the third ear begins to swell, topdressing should be carried out according to the first water and fertilizer management method 1 time, and then it can be managed according to the method of watering twice 1 time.
This can not only promote the vigorous growth of plants, but also promote the slow expansion of young fruits, and improve the single fruit weight and sugar taste quality of tomatoes.
Spraying foliar fertilizer
Spraying 0.3% potassium dihydrogen phosphate +0.2-0.3% borax solution or boric acid solution twice during tomato flowering. After fruit setting, spray it twice with 0.3% potassium dihydrogen phosphate+1-2% calcium superphosphate filtrate +0.3-0.5% urea solution.
It is used to improve the quality of flowering and pollination, promote tomato fruit setting, prevent flower and fruit falling, prevent fruit cracking and abnormal fruit and tomato navel rot.
Dip in flowers to protect fruit
In the early flowering period of the company, dipping the flowers with 25PPm tomato extract or15 ppm 2,4-d can prevent the flowers from falling and the fruits from falling.
If appropriate amount of iprodione, iprodione or pyrimethanil is added when dipping flowers, it can also play a role in preventing gray mold. Soaking flowers too early is easy to cause fruit stiffness, and soaking flowers too late will cause empty fruit.
Thinning the first ear
2-3 fruits can be left in the first ear of tomato, and then 4 fruits can be left in each ear, so that the fruits can be thinned early and more nutrients can be saved.
Remove old leaves
In the middle and late period of tomato growth, timely removal of diseased leaves, yellow leaves and old leaves in the middle and lower parts can not only preserve nutrition, promote berry expansion and early coloring, but also improve ventilation and light transmission, thus playing a role in disease prevention.
Breaking the top and coring
When the tomato has 4-5 fruit sets, topping and coring in time can not only prevent vigorous growth, but also improve the fruit setting rate of tomato and make it color and mature faster and better.
Pruning and raking
When tomatoes bloom and set fruit, the first flower or young fruit of the first ear should be removed. When the fork length is about 10 cm, the first fork can be made. After fruit setting, the fork on the upper part of the plant should be knocked out in time to avoid affecting the subsequent flowering and fruit setting.