Symptoms such as yellow leaves, leaflets, and falling flowers and fruits of vegetables are all related to the lack of nutrients. After analysis by experts, there are mainly the following reasons:
First, there are more cloudy days. There are many cloudy days, and the low temperature causes injury to the root system of vegetables, which affects their absorption of nutrients and shows symptoms of deficiency. In addition, lack of sunlight on cloudy days leads to malnutrition of crops, inability to convert carbohydrates, thicker and smaller leaves, damaged root systems (especially root tips), browning, and no new roots. If there is more fertilizer and water management at this time, the vegetable rooting phenomenon is more, and it is impossible to absorb nutrients normally, and the vegetable is bound to have a deficiency. At this time, spraying foliar fertilizer is the most effective solution.
The second is the improper application of trace elements. In order to pursue high yields, some vegetable farmers blindly applied a large amount of chemical fertilizers to the greenhouses, while ignoring the application of trace elements, which resulted in a general increase in nitrogen, phosphorus, and potassium in the soil, but insufficient trace elements. Some vegetable farmers use excessive amounts of trace element fertilizers, because of the antagonism, the absorption of other elements by the root system is inhibited, thus showing symptoms of deficiency.
Third, the soil solution concentration in the shed is too high. Due to the large amount of chemical fertilizers used by vegetable farmers throughout the year, the soil solution concentration is too high, the plant root system is poorly developed, and it cannot absorb sufficient nutrients to supply the plant growth, and the plant shows a deficiency.
The fourth is inappropriate prevention. Some vegetable farmers see that the leaves of the vegetables turn yellow, they think it is a lack of fertilizer, so they apply a lot of chemical fertilizers, and the results are counterproductive, leading to the increasing deficiency of vegetables. Therefore, more guidance should be given to vegetable farmers to distinguish them from various symptoms of deficiency.
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