Greenhouse Planting--Four Point Figures

Producing early spring crop and vegetables in greenhouse need to use shed film to improving temperature, which provide appropriate temperature for plants growth. Therefore, it is important to do the wind proof work, protection shed film and skeleton. Especially in high level wind weather, such as tents membrane fastening rickety, often cause the whole greenhouse suffer. For this reason, you should pay attention to the weather forecast, solid the scaffolding, binding squeeze film line and check the tent membrane for breakage, find out problems, take early and specific preventive measures.

Firstly, planting vegetables should be timely. In the central area of our province, spring and lettuce is suitable in planting period, generally it is in 3 months before and after the spring equinox to the middle, compounded with fertilizer 30 kg, boron fertilizer 1 kilogram, zinc fertilizer 1 kilogram, deep plugging, leveling, strip to flat. Planting should choose when sunny morning, and per hole shin compound fertilizer 25 kg. Planting depth and soil can fill and level up. After watering, planting density general variety is in 40 centimeters, and the space in the rows is 30 centimeters, planting 4000 ~ 5000 plants per acre.

Secondly, the field management.The second day after planting should cover the plastic film. After 15 days, it is the time to water the plants second. When the tender bine began to swollen the water, it should watering more and fertilizer more; per acre should be 50kg ammonium bicarbonate or 25kg nitrogen potash fertilizer. When it is in the tender bine growing period, it should keep the soil moist, watering in every 7 days.

Thirdly, prevention of disease and insect governance
Downy mildew is the common diseases for asparagus lettuce; the main sources of infection blade, seedling incidence after yellowing, and then it will die. The plants by the lower old blade began to disease. Sometimes, the germ can cause the system infection, expanded to stem, causing stem black. Prevention and treatment can be used by 68.75% silver per acre with 50 ~ 75 ml water for 30 kg spray. Black cutworm, the underground pest, mainly hazards lettuce roots in late march after diluted available proximal filling root. Aphids and white lice can choose the 10% imidacloprid, controlled by 800 ~ 1000 times liquid spraying.

Fourly, timely harvest. The best time for Asparagus lettuce harvest is that when the heart leaf and the outside leaf phase are at ordinary times, or before the buds, commonly known as "flat mouth", asparagus lettuce top and the top blade tips phase are at the same length. Although premature harvest, can lead to yield is low, but the recovery too late, it also will affect the quality. When the market is good, it can appropriate recovery 1 ~ 2 days earlier.

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