PPF (luminous flux density) is an indicator used to measure the light energy output of plant lamps, indicating the flow of light energy through a unit area in a unit time. The higher the PPF, the following effects on plant lights:
1. Provide more adequate light energy: high PPF means that plant lamps can output more light energy, which is very important for plant photosynthesis. Photosynthesis is a key process for plant nutrient synthesis and growth, and high PPF can provide more adequate light energy and promote the efficiency of plant photosynthesis, thus promoting plant growth and development.
2. Promote the photosynthesis efficiency of plants: plant lamps with high PPF can provide more intense light, so that the chlorophyll on the leaves of the plants can absorb light energy more fully, thus improving the efficiency of photosynthesis. The improvement of photosynthesis efficiency can increase the nutrient synthesis capacity of plants and promote the growth and development of plants.
3. Increase the yield and quality of plants: high-PPF plant lamps can provide more intense light and promote the growth rate and yield of plants. In agricultural production, the use of high-PPF plant lamps can increase the yield of crops, and the quality of crops may also be improved due to the increase in light intensity.
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1. The red spot on the leaf of the red spot disease is gradually expanded into a round or elliptical lesion. When it is severe, all parts become black and withered, and the inner wall of the stem has a black sclerotium. Chemical control: Spray 1:2:100 Bordeaux mixture at the beginning of the disease, and then spray 50% carbendazim 500 times once every 10 days, and spray 2 to 3 times. The initial spray of Bordeaux liquid is better than carbendazim, and after spraying carbendazim, the control effect is higher than Bordeaux mixture.
2. The rust spots appear on the leaves of the cast disease until the leaves are dry and the plants are all dead. Chemical control: 50 grams of 15% rusting can be used, sprayed 50-60 kilograms of water, 40-60 kilograms per acre. Spray again 1 day after application for about 20 days. It is necessary to pay attention to the application of the drug at the time of the disease, otherwise, the control effect is not good.
3, Fusarium wilt mainly has root lesions black, the main root is short, the lateral roots are less, the leaf color turns yellow, the plant is wilting, and the top stem leaves are drooping. Chemical control: In the early stage of the disease, roots can be applied with 50% methyl thiophanate 500 times solution. 2 to 3 times of medication, have a good control effect.
4, broad bean elephant larvae into the silkworm beans in the real harm, resulting in the child's taste becomes bitter, weight loss, causing reduced production, quality deteriorated. Drug control: In the early flowering period to the full bloom period of the broad bean, 20% of the cockroach is used to kill 20 ml of water, and 60 kg of water is sprayed to kill the adult worm. After 7 days, it is sprayed once again, and the control effect is good. In the final flowering period of the broad bean, spraying 40% of the fruit 1000 times liquid, the poisonous grass kills the larva also has a good effect.
Prevention and control of broad bean pests and diseases, in addition to the selection of disease-resistant varieties, reasonable close planting and pruning, improve ventilation and light transmission conditions, do a good job of drought prevention and drainage, reduce field humidity, increase phosphorus and potassium fertilizer, enhance the disease resistance of broad bean, chemical control is also necessary .
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