First, the amount of fertilizer and frequency of fertilization are determined according to the growth period of the vegetables. In the initial stage of growing vegetables, the amount of fertilizer needed to increase, but due to the sufficient amount of basal fertilizer, there will basically be no shortage of fertilizer. This period can be fertilized according to the growth of the seedlings as appropriate, and the amount of fertilizer should not be too large, and it is even more inappropriate to have fertilizer for every water. After the plant enters the growth stage, the amount of fertilizer is required to increase. At this time, fertilizer and water need to be attacked, and each watering must be carried with fertilizer. Usually, 15-20 kilograms of compound fertilizer is applied per mu, or biological fertilizer is applied per mu. - 40 kg. The appearance of gold rims on the leaves is a symptom of over-fertilization. It is necessary to reduce the amount of fertilizer and frequency of fertilization. In the late growth period, the amount of fertilizer needed by the plants is reduced. At this time, the amount of fertilizer and frequency of fertilization should be reduced, but trace elements should be added to prevent the lack of vegetables.
The second is to determine the frequency of fertilization according to the season. In winter, there is less evaporation of soil moisture and less frequent watering, especially in deep winter greenhouses where vegetables are usually poured for 20 to 30 days. In this case, every water must be fatted.
The third is to determine the frequency of fertilization according to the type of vegetables. The fertilizer requirements of various vegetables are different, so the number of fertilization should also be determined according to the type of vegetables. Leaf vegetables have a short growing period, fast growth, and a short fertilization interval. Solanaceous vegetables and melons have a long growing period, the growth rate is relatively slow, and the fertilization interval should be longer.
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