Fertilization to avoid five taboos
Fertilization is indispensable for high vegetable yields. But fertilization can't be applied casually, so what problems should be paid attention to when fertilizing vegetables?
Do not apply ammonium nitrate to leafy vegetables
Chinese cabbage, Chinese cabbage, amaranth, etc., can easily absorb nitrate nitrogen fertilizer during the growth period. If ammonium nitrate is applied, leafy vegetables absorb nitrate ions. After human consumption, nitrate ions will enter the human body. Cumulative poisoning.
Do not water vegetables after applying urea
The nitrogen contained in urea is amide nitrogen, which can be absorbed and utilized by vegetable roots after being converted into ammonium carbonate or ammonium bicarbonate under the action of urease secreted by soil microorganisms. If urea is applied immediately after watering or encountering rain, the amide nitrogen will be lost. Therefore, whether urea is used as a base fertilizer or top dressing for vegetables, it should be watered 5 to 6 days after it is fully transformed to avoid losses.
Do not apply ammonium bicarbonate when the vegetable field is short of water
Ammonium bicarbonate is chemically unstable and easy to volatilize. When ammonium bicarbonate is applied to the vegetable field, whether it is used as a base fertilizer or a top dressing, it should be applied deeply when the vegetable field is moist and covered with soil immediately after application.
Do not spray leafy vegetables
High concentration nitrogen fertilizer
If urea, ammonium sulfate, etc. are used for leaf spraying on vegetables, although the leaves can be green and good in color, the content of harmful salts in green leafy vegetables will increase significantly, which will then affect the health of consumers.
Don't use high-concentration vegetables in greenhouses
Ammonium Nitrogen Fertilizer
High-concentration ammonium nitrogen fertilizer is easily decomposed under the action of soil enzymes under suitable temperature and humidity conditions, and finally converted into gaseous ammonia, which will lead to vegetable ammonia poisoning and affect the quality and yield of vegetables.
Is it okay to fight medicine on rainy days?
No matter what season, there will be rainy weather. In cloudy and rainy days, the greenhouse has insufficient sunlight and high humidity, which is a period when diseases are high. Therefore, most vegetable farmers spray fungicides before cloudy days to prevent the occurrence of diseases in advance. However, if there are more consecutive cloudy days and longer autumn and winter seasons, diseases may occur even if the medicine is used in advance, and many vegetable farmers are wondering whether they can spray the medicine at this time? Is it okay to fight medicine on a rainy day?
Many people think that if you can't spray medicine on cloudy days, it will increase the humidity in the shed, which will aggravate the disease. And when it is cloudy, the photosynthesis of the plants is weakened, and the stress resistance of vegetables is also reduced, and it is more prone to phytotoxicity after applying the medicine.
However, for biological pesticides, cloudy days are often advantageous. This is because on a cloudy day, there is neither the influence of ultraviolet rays in the sun, but also a relatively large humidity, but instead the use of microbial bacteria to accelerate the multiplication and increase the efficacy of the medicine. For example, for leaf spot diseases, Trichoderma harzianum, Bacillus subtilis, chitosan, chitin and other sprays can be selected; nutrients can be supplemented, leaf resistance can be improved, and the preventive effect is outstanding. When the weather turns fine, It can be combined with chemical control to basically control the disease.
Compared with chemical pesticides, biological pesticides have a slower onset, but their control effects are more durable and stable. The best advantage is that they will not cause pesticide residues (to avoid phytotoxicity), have no pollution to the environment, and conform to agricultural requirements. The principle of sustainable development. In addition, with the continuous development of facility agriculture, the use of new pesticide equipment for spraying can greatly improve the effect of pesticide application and reduce the humidity in the shed, such as mist sprayers, powder sprayers, and so on. Therefore, it is advisable to spray microbial pesticides on cloudy days to prevent diseases.
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