The cultivation techniques of greenhouse vegetables have been widely used. Hydroponic vegetable refers to the vegetable that is cultivated under the traditional soil cultivation form, in which most of the roots are grown in the layer of nutrient solution and liquid, which only provides water, nutrients and oxygen through the nutrient solution. Hydroponic vegetables have a short growth cycle and are rich in vitamins and minerals essential to the body. When selecting and determining the varieties to be planted, everyone should also be scientific and reasonable, and maximize the benefits as much as possible. In general, producers should pay attention to the following aspects in the selection of vegetable varieties.
High economic efficiency
The manpower and material resources invested in greenhouse cultivation are much higher than those in open field cultivation. The cultivation of vegetables in greenhouses is for the benefit of most farmers. Therefore, when deciding on the type of vegetable grown, you should first consider the amount of return on your investment (meaning: the accumulation of future earnings). For example, some rare, rare and small-growing vegetables generally have high economic benefits, but they often do not have much consumer market; some conventional vegetables, as long as the selection of suitable varieties, determine a reasonable sowing (type: crop cultivation One of the measures) (cultivation) season, coupled with scientific management, can also achieve better benefits.
Good resistance to low light
Although the greenhouse covering material has a certain light transmittance (generally better light transmission performance of the greenhouse film is more than 85%). Hydroponic plants should be supplied with liquid during the cultivation process to ensure adequate nutrient supply. The liquid supply time is generally selected during the day and no liquid supply or less liquid supply at night. The number of liquid supply on sunny days is more, and there is less liquid supply in rainy days; when the temperature is high, the light is stronger, and vice versa. Usually, the liquid is supplied 2-4 times a day, and it can be grasped for 30 minutes each time. This can be adjusted at the right time with the time controller. However, such light transmission is affected by the type of the film, the use time, and the use environment. Many of the covering materials are used for a period of time, and the light transmittance is greatly reduced. And in the rainy weather in winter and spring, the light often fails to meet the crop growth needs. Plus some growers use multiple layers of coverage, and the crops receive less light. Therefore, considering the light, the varieties of vegetables suitable for cultivation in greenhouses should be relatively weak. Otherwise, vegetables are easy to grow in low light, and the flowers are seriously damaged and the diseases are more.
Strong resistance to moisture and disease
Due to the high temperature in the greenhouse, the evaporation of water is large, and the greenhouse film (thin and soft transparent sheet) has good airtightness, poor water permeability and permeability, and high humidity in the shed. The hydroponic plants cultivated by soilless culture vegetables using this soilless cultivation technique are favored by domestic and foreign flower consumers for their cleanliness, elegant style, strong ornamental, environmental protection and pollution-free. In particular, when the temperature is kept under low temperature conditions, the humidity in the shed is relatively large, and the relative humidity of the air is generally above 90%. Under such high humidity conditions, most vegetables are poorly grown, and the occurrence and spread of various diseases are also provided. Favorable conditions. Therefore, the vegetable varieties cultivated in the greenhouse should be more resistant to moisture and have strong disease resistance.
Adaptable to temperature
Mainly reflected that the variety is not sensitive to low temperature and large temperature difference between day and night. The variety is required to be tolerant to low temperature, and can grow normally in winter and early spring. At the same time, the variety is required to have high temperature resistance at high temperatures. For example, during the first and second months, in sunny weather, the temperature in the greenhouse can be as low as 5 °C before sunrise in the morning. In the midday sun, the temperature in the greenhouse can quickly exceed 30 °C or even 40 °C. Such large temperature changes require that vegetable varieties have a strong temperature adaptability.
Cater to market requirements
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 types of cultivated vegetables must cater to the needs of consumers and the market, and the harvesting period of these types must also meet the needs of the market. For example, some areas like to eat red peeled eggplant, while some areas like to eat omelle, some areas like to eat the skin of bamboo eggplant; some places to eat big red tomatoes, while some places Like pink tomato fruit. This requires growers to fully grasp the consumption habits of the sales market, rationally select varieties, and cater to the needs of the market.
High economic efficiency
The manpower and material resources invested in greenhouse cultivation are much higher than those in open field cultivation. The cultivation of vegetables in greenhouses is for the benefit of most farmers. Therefore, when deciding on the type of vegetable grown, you should first consider the amount of return on your investment (meaning: the accumulation of future earnings). For example, some rare, rare and small-growing vegetables generally have high economic benefits, but they often do not have much consumer market; some conventional vegetables, as long as the selection of suitable varieties, determine a reasonable sowing (type: crop cultivation One of the measures) (cultivation) season, coupled with scientific management, can also achieve better benefits.
Good resistance to low light
Although the greenhouse covering material has a certain light transmittance (generally better light transmission performance of the greenhouse film is more than 85%). Hydroponic plants should be supplied with liquid during the cultivation process to ensure adequate nutrient supply. The liquid supply time is generally selected during the day and no liquid supply or less liquid supply at night. The number of liquid supply on sunny days is more, and there is less liquid supply in rainy days; when the temperature is high, the light is stronger, and vice versa. Usually, the liquid is supplied 2-4 times a day, and it can be grasped for 30 minutes each time. This can be adjusted at the right time with the time controller. However, such light transmission is affected by the type of the film, the use time, and the use environment. Many of the covering materials are used for a period of time, and the light transmittance is greatly reduced. And in the rainy weather in winter and spring, the light often fails to meet the crop growth needs. Plus some growers use multiple layers of coverage, and the crops receive less light. Therefore, considering the light, the varieties of vegetables suitable for cultivation in greenhouses should be relatively weak. Otherwise, vegetables are easy to grow in low light, and the flowers are seriously damaged and the diseases are more.
Strong resistance to moisture and disease
Due to the high temperature in the greenhouse, the evaporation of water is large, and the greenhouse film (thin and soft transparent sheet) has good airtightness, poor water permeability and permeability, and high humidity in the shed. The hydroponic plants cultivated by soilless culture vegetables using this soilless cultivation technique are favored by domestic and foreign flower consumers for their cleanliness, elegant style, strong ornamental, environmental protection and pollution-free. In particular, when the temperature is kept under low temperature conditions, the humidity in the shed is relatively large, and the relative humidity of the air is generally above 90%. Under such high humidity conditions, most vegetables are poorly grown, and the occurrence and spread of various diseases are also provided. Favorable conditions. Therefore, the vegetable varieties cultivated in the greenhouse should be more resistant to moisture and have strong disease resistance.
Adaptable to temperature
Mainly reflected that the variety is not sensitive to low temperature and large temperature difference between day and night. The variety is required to be tolerant to low temperature, and can grow normally in winter and early spring. At the same time, the variety is required to have high temperature resistance at high temperatures. For example, during the first and second months, in sunny weather, the temperature in the greenhouse can be as low as 5 °C before sunrise in the morning. In the midday sun, the temperature in the greenhouse can quickly exceed 30 °C or even 40 °C. Such large temperature changes require that vegetable varieties have a strong temperature adaptability.
Cater to market requirements
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 types of cultivated vegetables must cater to the needs of consumers and the market, and the harvesting period of these types must also meet the needs of the market. For example, some areas like to eat red peeled eggplant, while some areas like to eat omelle, some areas like to eat the skin of bamboo eggplant; some places to eat big red tomatoes, while some places Like pink tomato fruit. This requires growers to fully grasp the consumption habits of the sales market, rationally select varieties, and cater to the needs of the market.
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