Although it has a certain degree of light transmission, the light transmission performance of a generally large greenhouse film reaches more than 85%. However, the light transmittance is limited by the type of film, the use time, and the use environment, and the light transmittance that is not high is greatly reduced. And in the winter and spring rainy weather, the light is not enough. Plus some growers use multi-layer coverage, and even less light. Therefore, considering the light, vegetable varieties suitable for cultivation in greenhouses should be relatively resistant to low light, and the light saturation compensation point should be low. Otherwise, vegetables are prone to prolonged growth under low light, with serious drop and fruit loss and more diseases. Humidity resistance (resistance) is strong because of the high temperature in the greenhouse, the large amount of water evaporation, plus the airtightness of the greenhouse membrane, poor water permeability, and high humidity in the greenhouse. Especially when cultivated under closed conditions at low temperature, the humidity inside the greenhouse is relatively high, and the relative humidity of the air is generally above 90%. Under such high humidity conditions, most vegetables are poorly grown, and they provide favorable conditions for the occurrence and spread of various diseases. conditions of. Therefore, the vegetables cultivated in the greenhouse should be more resistant to moisture and stronger in disease resistance. The strong adaptability to temperature is mainly reflected in the insensitivity to low temperature and large temperature difference between day and night. The varieties are required to be tolerant to low temperatures, allowing them to normally grow in the winter and early spring. However, this species is also required to have strong high-temperature burn-resistance at high temperatures. For example, in the period of January and February, when the weather is fine, before sunrise in the morning, the temperature in the greenhouse can be as low as 5°C. In the noon sunshine, the temperature in the greenhouse can quickly exceed 30 °C or even 40 °C. Such a large temperature change requires a strong adaptability of vegetable varieties. To meet the requirements of the market, the purpose of cultivation of greenhouse vegetables is not only to produce vegetable products, but also to make the products sell smoothly. To achieve this goal, the cultivated vegetable species (variety) must cater to consumer and market requirements, and the harvest period of these species (varieties) must also meet the market's needs. For example, people in some areas like to eat eggplant with red skin. In some areas, people like to eat inked eggplant. In some areas, people like to eat bamboo silk eggplant; some people eat red Tomato, but some people like to eat pink tomato fruit. This requires growers to fully grasp the spending habits of the sales market. SICHUAN UNIWELL BIOTECHNOLOGY CO.,LTD. , https://www.uniwellbio.com
Large variety of greenhouse dishes are selected
The human and material resources invested in the large-scale shed cultivation are much higher than those in open cultivation. The use of greenhouses for cultivating vegetables is for the benefit of most farmers. Therefore, when deciding on the types of vegetables to be grown, the first thing to consider is the return on investment. For example, some rare, rare and slightly grown vegetables generally have higher economic benefits, but often there is not much consumer market; some conventional vegetables, as long as the selection of suitable varieties, to determine a reasonable sowing (cultivation) season Plus, scientific management can also achieve better results.
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