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Many vegetable farmers have achieved good results by cutting off the upper leaves when planting green onions. According to local vegetable farmers, this method can significantly increase the speed of slow seedlings, is conducive to the growth and development of green onions, and increase the yield of green onions.
Compared to traditional whole plant colonization methods, the method of leaflet colonization has many advantages.
First of all, cutting leaves and planting reduce the leaves of the seedlings, which is conducive to the handling of farming and planting after the seedlings, and it is not easy to cause the plants to be injured, which can speed up the planting and improve the work efficiency.
Secondly, cutting leaves can reduce the water and nutrient consumption of the seedlings, which is beneficial to the rapid growth of the seedlings. When the green onion was transplanted, the root system was seriously injured, and the ability to absorb water and nourish the nutrients was in a stagnant state, which could not meet the water and nutrients consumed by the leaves after planting. In the case that the plant is unable to provide sufficient nutrients, limited water and nutrients will preferentially supply new leaves for growth and development, and the leaves that grow up before planting are often aging and yellowing due to lack of water and nutrients, and it is difficult to play the role of leaves. After planting and looking into the ground, we can find that the green onions that have been slowly planted in the ground, the leaves that grow before the planting are mostly dry and yellow, lose the role of the leaves, relying on the newly grown young leaves, the green onions can grow quickly. Moreover, when the onion is planted, the leaves of the onion seedlings are seriously damaged. After the planting, the leaves are affected by the wind and the water flow, which is easy to cause the plants to fall down, which is not conducive to the growth and development of the green onion. Therefore, when the green onions are planted, it is completely feasible to remove the old leaves and large leaves, which is more conducive to plant slow seedlings and growth.
The specific practice of cutting leaves is as follows: in the nursery, after pulling out the seedlings, the seedlings are neatly bundled into small bundles, and then the upper part of the leaves are cut with a sickle, leaving only the lower "white onion" and about 10 cm. Onion leaves. In this way, the onion leaves become shorter and smaller, and the handling is convenient, and the damage is small, which is beneficial to the healthy growth of the onion seedlings. Rapid planting of onion seedlings can also ensure that the plants stand upright, the leaves have less water evaporation, and the roots are lightly burdened, which is conducive to rapid new roots, new leaves, and slow seedlings.
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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