Zhang Hegui of Pingdu City, the tomatoes planted this spring is always poorly transformed, especially when the tomatoes are turning color, the fruit shoulders always remain green, and there are serious necrotic spots. He originally thought it was caused by a bacterial disease, but no effect after spraying. Later he was told that he was caused by poor absorption of boron by tomatoes. This made him feel very puzzled. Before planting tomatoes, he tried to prevent poor flower bud differentiation of tomatoes. He also used 1 kilogram of boron fertilizer in the greenhouse soil. Boron in the soil should be sufficient, but why does it show boron deficiency when growing tomatoes? Later, he learned from the newspaper that the Shouguang Soil and Fertilizer Testing and Research Center carried out the soil testing business, so he took soil samples to Shouguang for soil testing. Through the detection of eight indicators of soil, the results showed that the content of potassium in the soil reached 699.1 mg/kg, which was the main reason that lead to tomato boron deficiency and poor color transformation.

It turned out that when Zhang was growing tomatoes, he was told that the use of high-potassium fertilizers could promote the coloration of tomatoes, so he used high-potassium fertilizers continuously after tomatoes entered the color-changing period. The result was excessive use of fertilizers, resulting in potassium in the soil. The content is too severe. When potassium is used in excess, antagonism occurs between potash and boron fertilizers, which affects the absorption and utilization of boron in roots of tomato plants, thus causing the tomatoes to exhibit boron deficiency symptoms. Not only that, when excessive potassium is used, it will also affect the absorption and utilization of magnesium, iron, and zinc in tomato roots. Therefore, when Zhang grows vegetables in the future, it is not possible to apply potassium fertilizer in a partial manner, and attention should be paid to balanced fertilization and the use of high potassium fertilizers. Balanced fertilizers are used alternately to prevent the use of too much potassium, which affects the absorption and utilization of other mineral elements in the tomato roots, resulting in poor tomato growth.

At the same time, another cause of poor absorption of boron fertilizer in tomato roots is soil alkalinity (test results show that the soil pH is 7.4), because boron fertilizer is more easily absorbed by vegetables in acidic conditions, so when the fertilizer is used by vegetable farmers , should pay attention to adjust the PH value of the soil to the range of 6.0-7.0, so that it can promote the absorption and utilization of boron in tomato roots.

Now, in view of this situation, Master Zhang also has to pay attention to increasing organic fertilizers in addition to reducing the potassium content of the soil by using water pressure salts during the summer empty season. Because Master Zhang's organic fertilizer content in the soil is only 13.26g/kg, and the requirement for the content of 20.0g/kg of soil organic matter required for the growth of suitable vegetables is quite different, so we must pay attention to the application of organic fertilizer. After adding organic fertilizer, not only can increase the organic matter of the soil, improve the soil environment, but also can use the organic acid produced in the organic fertilizer decomposition process to adjust the PH value of the soil, enhance the absorption and utilization of boron fertilizer in tomatoes.

The vegetable farmer needs to be reminded that if the fertilizer of an element is already applied before the vegetable is planted, but the symptoms of the element are lacking after the vegetable is planted, the vegetable farmer should first solve the problem by spraying the leaf. Promote the normal growth of vegetables.

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