step Drill Bit is a drill bit that has the tip ground down to a different diameter. The transition between this ground diameter and the original diameter is either straight, to form a counterbore, or angled, to form a countersink.
The advantage to this style is that both diameters have the same flute characteristics, which keeps the bit from clogging when drilling in softer materials, such as aluminum;. Most of these bits are custom-made for each application, which makes them more expensive.
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Second, affecting the quality of the fruit, especially in the late stage of fruit growth, if a large amount of nitrogen fertilizer is injected, the sugar content of the fruit will decrease, the hardness will decrease, the coloring will be poor, and it will not be resistant to storage, thus reducing the economic value.
Third, affect the quality of branches and buds If the application of excessive nitrogen fertilizer in the autumn, the length of the autumn shoots will increase, the leaves are delayed, the maturity of the branches is not enough, and the winter is easy to cause pumping. In addition, because the new shoots stop growing late, the nutrients in the shoots are insufficient, which is unfavorable to form a full and strong flower bud, which affects the fruit quality and yield in the coming year.
4. It is easy to cause fertilizer poisoning due to the application of a large amount of fertilizer, increasing the concentration of soil solution, making it difficult for the roots of fruit trees to absorb water and inorganic salts, causing the aboveground parts to wilting. If not timely remedy, the tree body will not be able to absorb water. death.
5. The imbalance of nutrients in the tree has an antagonistic effect between the nutrient segregants. That is, the presence of a certain nutrient segregant can inhibit the activity of another or more nutrient segregants, thereby affecting the absorption of the tree. For example, the amount of nitrogen fertilizer applied in acidic soil should not be too much, otherwise it is difficult for crops to absorb calcium ions. Excessive application of calcium fertilizer can induce deficiency of zinc, boron, iron, magnesium, manganese, etc. in crops. Excessive use of potassium fertilizer will affect the absorption of calcium and magnesium ions. Excessive application of phosphate fertilizer can also cause difficulty in the absorption of zinc and induce zinc deficiency. 
Excessive fertilization of fruit trees is more harmful
First, the fruit trees cause extravagant absorption of nutrients, and the fruit trees often absorb nutrients too much beyond their normal physiological needs, called the luxury absorption of nutrients. It only increases the concentration of nutrients in the tree, but it has no effect on the increase in yield.
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