It is a great hazard to spread fertilizer in greenhouse vegetables.

At present, with the continuous development of high-efficiency agriculture, greenhouse vegetables have developed quite rapidly. However, due to some technologies that cannot keep up, especially the fertilization method is unreasonable, the damage to vegetables is relatively large. Some vegetable farmers are convenient for the map, and when they are fertilizing, they are often sprinkled. I don't know, it is very harmful to spread the fertilizer in the greenhouse vegetables. The lighter causes the loss of fertilizer and the reduction of vegetables, and the heavy ones will cause the death of vegetables in the whole greenhouse. The main performance is as follows:

One is ammonia poisoning. Nitrogen in nitrogen fertilizer or compound fertilizer, when applied to soil surface water after spraying, will rapidly decompose at high temperature and escape ammonia. Due to the strong airtightness of the greenhouse, the ammonia concentration will continue to accumulate and increase. When the concentration reaches a certain value (such as cucumber and tomato in 5×10-6 for 15 hours or 40×10-6 for only a few hours), it will lead to Vegetable death.

The second is to increase soil salt damage. Due to the specific microclimate conditions in greenhouses, combined with the use of fertilizers, long soil cover in the greenhouse, little or no rainwater leaching, and large evaporation of soil in the greenhouse, soil salinity has gradually become the current greenhouse production. One of the main obstacles. In general, in the case of deep application, the salt in the surface of the greenhouse requires the upward movement of soil moisture to bring the salt to the soil surface. The spreading of the surface of the fertilizer directly accelerates the occurrence of salt damage in the surface soil.

Third, it is not conducive to the bottoming of vegetable roots. The growth of vegetable roots is fertile, and the roots always extend in the direction of fertilizer. Due to the surface layer of the fertilizer, it is not only detrimental to the rooting of the vegetable roots, affecting the development of the root system, and the surface roots are also susceptible to salt damage, thereby damaging the root system.

Therefore, the author reminds the majority of vegetable farmers that in the production process of greenhouse vegetables, we must change the bad habit of applying fertilizer. Apply fertilizer to the soil and cover the soil. At the same time, it is necessary to pay attention to watering and salt to improve fertilizer efficiency.

Author: Zheng Lei
Source: Henan Science and Technology News

UC Series Bearing

Pillow blocks are advanced applied in places with simple equipment and spare parts, such as agricultural machines, convey system or construction machines. One unit of pillow block consists of deep groove ball bearings with spherical outer rings closed in double sides and a housing made by gray cast iron or punches steel.

A Pillow Block Bearing (Plummer block) is a mounted bearing used to provide support for a rotating shaft with the mounting surface on a parallel line with the axis of the shaft.

Pillow block bearings are generally self-lubricating.

Pillow block bearings are a form of mounted bearing used to provide load support for a rotating shaft axis. The bearing housing mounts to a surface parallel to the shaft axis. Selection of the appropriate bearings can be accomplished based on the shaft size and the radial and thrust load requirements. Pillow block bearings are designed to support a shaft: the mounting surface is on a parallel line with the axis of the shaft. Elongated bolt holes in the base or feet of the unit allow for some adjustment and easy mounting of the pillow block bearing.

Uc Series Bearing,Waterproof Insert Ball Bearing,Uc Series Pillow Block Bearings,Uc Series Mounted Ball Bearing

Shijiazhuang Longshu Mechanical & Electrical Equipment Trading Co., Ltd. , https://www.longsbearing.com