What are the requirements for water and fertilizer for planting tomatoes in greenhouses?

Tomato is one of the most popular vegetables in daily life. Water and fertilizer management in greenhouse tomato planting is particularly important, which is directly related to tomato yield.

Tomato plants are lush, with strong transpiration, developed roots, strong regeneration ability and strong water absorption ability. Therefore, tomato plants not only need more water, but also have the characteristics of semi-drought-tolerant plants. Rapid growth at seedling stage. In order to cultivate healthy seedlings and avoid excessive growth and diseases, water should be properly controlled, and the equivalent water content of soil is 60~70%. Before the first inflorescence bearing fruit, too much soil moisture can easily cause the plants to grow white and lead to falling flowers and fruits.

After the first inflorescence bears fruit, the fruit and branches and leaves grow rapidly at the same time, and more water is needed in the full fruit period, so irrigation should be carried out frequently to ensure water supply. During the whole fruit-bearing period, the relative water content of soil should be kept at 60-80% in order to balance water supply. Too much water will hinder root respiration and other metabolic activities, and in severe cases, root rot and seedling death. If the soil moisture is insufficient, the fruit expands slowly and the yield is low. During this period, it is also necessary to avoid the sudden wetting and drying of the soil, especially after the drought, the soil is flooded, which is prone to a large number of fruit dropping or cracking, and it is also easy to cause navel rot.

Take tomato in greenhouse in spring as an example. It is suggested that drip irrigation and fertilization technology should be adopted and the irrigation strategy of "small water irrigation" should be adopted. Under loam conditions, slow-growing seedlings should be watered enough, generally at10-15m3/mu. Crouching seedlings should be done after slow seedling growth to promote fruit setting. If the water content is good, you can stop watering. When the first walnut ear is big, irrigation and fertilization are started. Generally, drip irrigation is carried out once every 5~ 10 days, and irrigation is 6~ 12 cubic meters per mu each time. Stop watering 10~ 15 days before seedling drawing. Pay attention to the weather forecast. After watering, you can't catch up with the cloudy day. You should choose a sunny morning to water. With the increase of temperature and light intensity, it is necessary to shorten the irrigation interval and increase the amount of single irrigation.

High-efficiency amino acid compound liquid fertilizer, chelated micro-fertilizer and potassium dihydrogen phosphate solution can be used as supplementary fertilizers for tomato in the middle and late stage.