Some of the recent wintering greenhouse cucumbers have begun to be listed one after another, and over-winter tomatoes have also begun to produce results, and some have entered the period of fruit enlargement. When I went to the countryside to investigate, I discovered that many vegetable farmers blindly pursued previous crop yields. The excessive application of high-nitrogen and potassium fertilizers during the early growth stage of cucumbers resulted in poor root development, serious leggy, and lack of fruiting. Tomatoes were inhibited by the excessive use of potassium. Absorption of calcium fertilizer, resulting in lack of magnesium and calcium, increased rot and rot. How to top-dress fertilizers according to the growth characteristics of each growth period of the vegetables and the laws requiring fertilization should attract the attention of farmers. Here, the author proposes three points for the reference of farmers:
One is that the initial result is not just keeping up with fertilizer but also forgetting to raise the roots.
In Shouguang, Jiyang, and other greenhouse vegetable areas, the author found that some tomatoes had weak glutinous rice pods when they first fruited. Some vegetable farmers had strong gluten. Before the chilly weather did not cool down, they used chemical fertilizers in excess, and some even rushed. The use of fertilization containing hormones, which are unknown to others, resulted in long, weak, and damaged roots. This not only failed to achieve the effect of strengthening and protecting the fruits, but also laid a hidden danger for the later high-yield production. Farmers can increase the use of high-nitrogen and potassium fertilizers when cucumbers and tomatoes are first set in fruit, and they still rely on rooting and rooting for weak pods. It is recommended to use 5 to 10 kg of “Waldi Dragonfly Protein Bio-fertilizer†per acre. This bio-fertilizer can loosen the soil, increase soil permeability, increase the activity of soil beneficial microorganisms, and is conducive to the growth of crop roots. The roots of crops are developed to lay a good foundation for future stable production and high yields.
The second is the proper use of chemical fertilizers to reduce soil salt damage.
Now, the surface of many sheds with green and red soil is a typical manifestation of salinization. In general, a long time is spent on sheds, and more chemical fertilizers are used. The soil organic matter is low, the beneficial microorganisms are lacking, and the salinization is aggravated. In this soil, cucumber and tomato have poor root system, weak scorpions, and slow fruit enlargement. It is recommended to use 3 kg of “Magic 6-7†per mu and mixed with “Waldilong Protein Biofertilizer†to adjust the pH of the soil so that the acidic soil is close to neutral and effectively reduces salt damage.
The third is scientifically selecting foliar fertilizers, and applying top-dressing fertilizers in response to the parts and symptoms of the deficiency.
Physiological diseases of vegetables in greenhouses have occurred more severely than vegetable crops in the past few years. It is a scientific, economic, and effective method to supplement fertilizers through crop foliage. However, there should be some choices for supplementing fertilizers through the foliage of crops. It is not better to spray more fertilizer. A lot of cucumber leaves are huge and their pods are very long, which is related to the inability to use the foliar fertilizers correctly. In order to control the scorpion's appetite, some use foliar fertilizers that are profusely controlled or contain hormones, resulting in excessive control of hunger, fertilizer and hormone poisoning, and unnecessary losses. Due to the special growth environment of greenhouses, crops often suffer from deficiency syndromes. When the crops are deficient in magnesium, they are generally yellow in the middle of the crops; iron deficiency and zinc deficiency are generally manifested in the growing point of crops, that is, the upper leaves of crops are yellowing and growing. Light, small leaves, do not stretch; lack of potassium generally yellow leaves off the bottom of the old leaves. Farmers should selectively use foliar fertilizers for the parts of symptoms, and sometimes the lack of crops is not the lack of these elements in the soil. It is also related to excessive watering, drought, low temperature, and poor root development. When the lack of crops is discovered, it is recommended to use 5 to 10 kg of “Waldi Long Protein Bio-fertilizer†per acre, combined with flushing, foliar spraying of corresponding foliar fertilizers such as iron, magnesium, calcium, zinc and boron. Will play a better control effect.
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