Results the optimum temperature of photoperiod was 25 ~ 32 ℃(20 gallon pressure formed hdpe pots wholesale usa); The appropriate temperature in the first half of the night is 20 ~ 15 ℃, so that the nutrients produced during the day can be smoothly transferred to the roots and redistributed to the growing fruits and leaves and stems(v13 nursery pots). According to the requirements of vegetables for illumination, vegetables can be divided into three types.
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Three measures can be taken for cooling Management(15 gallon planters): shading and cooling to reduce the solar radiant energy entering the greenhouse; Evaporative cooling reduces the temperature and increases the latent heat consumption of greenhouse(perlite wholesale price); Natural ventilation of shed doors and windows and forced ventilation of fans are used to increase the ventilation capacity of greenhouse(20 gallon pressure formed hdpe pots wholesale usa).
Generally, in greenhouse vegetable production, special attention should be paid to the following points in temperature management(nursery trays wholesale): control the maximum greenhouse temperature in the daytime within the appropriate temperature range. In order to prevent heat damage, spray water on the plant leaves to prevent dehydration and seedling wilting(20 gallon pressure formed hdpe pots wholesale usa); No or less nitrogen fertilizer was applied in high temperature period.
Pay attention to the seasonal and daily changes of temperature, and pay attention to the phenomenon of "temperature inversion" in greenhouses and other facilities(5 gallon planters); In case of high temperature, shade and cool down first, and do not have strong ventilation; Do not smoke during drought and high temperature(20 gallon pressure formed hdpe pots wholesale usa); In case of high temperature weather, ventilation shall be carried out as soon as possible at about 25 ℃.
Light environment has light(v15 nursery pots), heat and morphological effects on the growth and development of greenhouse, greenhouse and solar greenhouse and other protected crops (including vegetables), which directly affects photosynthesis, photoperiodic response and organ morphology(98 cell plug trays). Therefore, it has a decisive impact on the high-yield and high-quality cultivation of protected vegetable production(20 gallon pressure formed hdpe pots wholesale usa).
Firstly, within a certain illuminance range, the photosynthetic rate of vegetable crops increases with the increase of illuminance(rootmaker propagation trays). If you do not understand that the light intensity changes seasonally, you cannot adjust the light environment according to the seasons, which limits the production potential of vegetable crops in the facility and fails to achieve the expected output and benefits(20 gallon pressure formed hdpe pots wholesale usa).
The differentiation of flower buds of mid-light vegetables has little to do with the light time, but is mainly related to its own nutrition(v14 nursery pots). At this time, the illuminance is called light compensation point. If the illuminance obtained by the crop is below the compensation point for a long time and the consumption of organic matter is more than accumulation, the crop growth will be slow and the plant will wither in serious cases(20 gallon pressure formed hdpe pots wholesale usa).
At this time(rooting tray), the illuminance is called the light saturation point(20 gallon pressure formed hdpe pots wholesale usa). When the illuminance drops to a certain value, the organic matter produced by crop photosynthesis is roughly the same as the organic matter decomposed by respiration. Their light saturation point is above 40000 lux, which requires strong light to grow well(nursery plant pots wholesale). Low light tolerant vegetables include lettuce, spinach, Artemisia annua, fennel, fennel and water radish.
If moderate light intensity is required, they can grow well(heavy duty gallon pot). When vegetables are planted in factories, artificial lighting or natural lighting can be selected according to the types of vegetables. In vegetable cultivation, the light intensity varies with the cultivation density, row direction, plant shape, intercropping, and intercropping(50 cell plug trays). Light loving vegetables include most eggplant fruits, melons and rainbow beans(20 gallon pressure formed hdpe pots wholesale usa).
According to the requirements and response of vegetable crops to light time, see can be divided into three types(greenhouse pots): long-day vegetables, short-day vegetables and medium-light vegetables(20 gallon pressure formed hdpe pots wholesale usa). The light saturation points of different crops are quite different; The light saturation point also increases with the increase of carbon dioxide concentration in the environment(long life propagation trays). The light saturation point is about 20000 lux, which can grow well under weak light.
Generally, the influence of light time on vegetable crops is manifested in three aspects(spill trays wholesale): one is to affect the photosynthesis time, generally 12~16 hours is appropriate; the other is to affect the accumulation of heat in plastic greenhouses, greenhouses, and solar greenhouses; the third is to affect flowering The effect of the result is the photoperiod effect(20 gallon pressure formed hdpe pots wholesale usa). Illumination affects photosynthesis, plant morphology, leaf size, etc(v16 nursery pots).
For short-day vegetables, it is not necessary to require a short light time, but the length of the dark period is very important(blow molded nursery pots). For example, for late-maturing varieties of soybeans, as long as there is 10 hours of darkness in each cycle, the length of light has an important impact on the development of vegetables(20 gallon pressure formed hdpe pots wholesale usa). Medium-light-loving vegetables include cabbage, cabbage, leeks, celery, kidney beans, peas and other vegetables.
Generally(200 cell plug trays), it not only affects the differentiation of flower buds, flowering, fruiting, and branching habits, but also the formation of some underground storage organs such as tubers, tubers, bulbs, bulbs, etc(20 gallon pressure formed hdpe pots wholesale usa). When they grow up, the length of sunlight only affects growth and has little effect on development. It is related to seedling quality and yield formation(nursery tray manufacturers). The light saturation point is 30,000 to 40,000 lux.
Not only the light intensity (commonly known as light intensity) affects the growth of vegetable crops, the length of light also affects the growth and development of vegetables(20 gallon pressure formed hdpe pots wholesale usa). No matter how many hours the light is in, it can induce the production of flower primordia(succulent plug trays). When the illuminance exceeds the light saturation point, it will cause light inhibition, decompose crop chlorophyll and cause physiological obstacles.
The illuminance required to produce the photoperiod effect is not very strong, and some dishes only need tens of lux(injection molded nursery pots). Among them, the light time refers to the theoretical hours from sunrise to sunset, rather than the actual hours of sunlight. In addition, the response of vegetable crops to the length of light is only sensitive at certain stages(20 gallon pressure formed hdpe pots wholesale usa). For example, some vegetables only require short-day sunlight in the seedling stage(farm tray).
The characteristics of the light environment of the greenhouse vegetables and its changing laws are not clear(20 gallon pressure formed hdpe pots wholesale usa). The supplementary light or shading adjustment cannot be adjusted in time according to the weather conditions, resulting in poor growth of the greenhouse vegetables and affecting the yield and quality of vegetables(1 gallon flower pots). When the illuminance increases to a certain value, the photosynthetic rate will not increase.