Reasonable Use of Greenhouses

Reasonable Use of Greenhouses

 In the use of greenhouses, there are still problems of low utilization rate and low economic benefit. At present, the use of plastic greenhouses should pay attention to the reasonable arrangement of stubble, so that the greenhouses can fully play their role and achieve the purpose of increasing income. The stubble arrangement can be divided into three basic types:

(1)The type of stubble that is mainly cultivated by me. The greenhouse is composed of three crops of dry ripening cultivation in spring (pepper, tomato, cucumber, string bean, etc.), post-autumn cultivation (pepper, tomato, etc.) and winter seedlings (eggplant, melon, bean). Spring begins in February and late in February. After the seedlings of eggplant and melons are planted, a small arch shed is covered with a grass fence to keep them warm. It will be available in the middle and late April. In the late autumn, the cultivation of tomatoes and peppers will be well-preserved in the later period of freezing and heat preservation, which can be extended to the New Year's Day. Winter seedlings are mainly tomato, pepper, and eggplant seedlings (3-4 true leaves), which are covered with multiple layers in the shed, and the stubble vegetables will end in mid-November. The above arrangements are based on early maturity in spring. Pay attention to the need to buy enough fertilizer and the cultivation technology level must be high to achieve the intended purpose.

 (2)The type of stubble that is mainly seedling raising. It is composed of winter seedling raising, spring seed retention and autumn postponed cultivation of blue stubble. The nursery starts from December, and the electric shed is set in the shed, which can be sown directly. The seedlings bred in the hotbed can also be planted in the cupboard. During the winter, small arches and grass fences should be used for heat preservation. After the seedlings are bred in spring, the parents of the pepper or tomato seed production are planted after the seedlings are shed, and the female parents of the car consignment (or the original species of various parents can also be propagated) for hybrid seed production. As long as you master the seed production technology, such as pepper generation hybrid Zaofeng No. 1, the yield per mu can reach 2000-2500 kg. Autumn stubble is still carried out as usual, mostly tomatoes and peppers. This stubble arrangement has higher economic benefits and can cultivate strong seedlings for large-scale vegetable fields.

(3)Stubble mainly based on seed retention. Types of. It consists of three kinds of stubble in winter and spring, seeding in summer and postponing cultivation in autumn. In winter and spring, it is used to keep seeds of Chinese cabbage, cabbage, and other cruciferous vegetables. Generally, the plants are planted in December, and the roof of the greenhouse is protected from rain after the spring reflection. The plastic film apron is used around the skirt film to prevent insect pollination and ensure seed quality. This shed can be used to raise seedlings of autumn tomatoes, cauliflowers, etc. in the middle and late July. In addition, it can also be used for the preparation of a generation of hybrids in spring and postponed cultivation in autumn. This arrangement is mostly used in breeding farms and agricultural research institutes.

Performance index of greenhouse

Light transmittance

The greenhouse is a daylighting building, so the light transmittance is the most basic index for evaluating the light transmission performance of the greenhouse. Light transmittance refers to the percentage of the amount of light that penetrates into the greenhouse and the amount of outdoor light. The light transmittance of the greenhouse is affected by the light transmittance of the greenhouse light-transmitting covering material and the shadow rate of the greenhouse skeleton, and the light transmittance of the greenhouse also changes at any time with the different angles of solar radiation in different seasons. The level of light transmittance in the greenhouse becomes a direct factor influencing crop growth and selection of crop varieties. Generally, the multi-span plastic greenhouse is between 50% and 60%, the light transmittance of the glass greenhouse is between 60% and 70%, and the sunlight greenhouse can reach more than 70%.

Insulation

Heating and energy consumption are the main obstacles to the operation of the greenhouse in winter. Improving the thermal insulation performance of the greenhouse and reducing energy consumption is the most direct way to increase the production efficiency of the greenhouse.

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