How to avoid dead seedlings and rotten roots of tomato planting in greenhouse

Greenhouse tomato has high requirements for planting, not only scientific technology, but also standardized management. How to let the greenhouse tomato "fine" growth, avoid dead seedlings, rotten roots and other interference, on the whole, to achieve "seed-tube combination", now for you to explain in detail the greenhouse tomato planting before and after those things, for reference.

Tomato planting in greenhouse

First, the "secret book" of tomato planting:

Pre-planting preparation: tomato production in early spring, in addition to the new greenhouse, there are generally previous crops of vegetables, before soil preparation, to clean the countryside. Fertilizer is mainly rotten farm manure, combined with calcium superphosphate about 50 kg. At the same time, ridging or furrow preparation, the ridge is generally 50cm row spacing, 15cm high. The border is generally made of 1 meter in width, 70~80cm in width and 15cm in height. After soil preparation, it is covered with plastic film. The high border is covered with plastic film and a small trench is opened in the middle of the border for irrigation in the dark trench under the plastic film.

Planting parameters: the ground temperature in the greenhouse should be stable, the planting density of early-maturing varieties should be per 40~50cm row spacing, and the 40cm plant spacing should be 3 000 to 3 500 seedlings. The middle-ripe varieties are planted in ridges with a row per ridge, and the planting density is about 2500 plants. It should be noted that when planting, the water should be fully watered. After the water seeps, seal the mouth of the plastic film.

Second, post-planting management:

Temperature and light: when the weather is clear in spring, the temperature in the shed can be kept high, so there is no need to turn on the heating system. However, in overcast and rainy weather, the temperature in the greenhouse should be heated (the temperature is set at 16 ℃, which is 4 ℃ lower than that in sunny night).

Humidity management: the relative humidity in the shed should be 70% and 80% as far as possible. When the outdoor humidity is too high or the temperature is too low, the heating system must be turned on to make the air flow and create a suitable humidity environment. At the same time, ventilation should be maintained to prevent the occurrence of diseases.

Fertilizer and water management: when watering, select clean water quality to prevent algae from growing and blocking drip irrigation pipes. After planting, water reasonably to ensure that the substrate is moist and that the tomato plant does not wilt. At the same time, combined with watering, topdressing in time.

Bee pollination: introduce bees into the shed to ensure that tomatoes can be pollinated evenly, so as to reduce the production of abnormal and bad fruits.

Third, the way to eliminate diseases and insect pests:

First of all, the production of tomato in multi-span greenhouse is easy to breed root-knot nematode, which is destructive. Therefore, it is necessary to maximize the temperature and humidity in the shed within a reasonable range. In addition, the source of insects and their growing environment should be eliminated. Secondly, spring tomato diseases generally occur from March to June, such as early blight, gray mold, leaf mold, late blight and so on.

Prevention and control methods: strictly do a good job in the disinfection of the frame in the shed, drip irrigation system, heating system, cultivation substrate and other related instruments, remove weeds and residual leaves of diseases and insect pests in the shed in time, and strengthen field inspection in culture. timely detection of diseases and insect pests for symptomatic control.