1.S-2 rockbit balls impact test Steel Ball are hardened throughout and have unusually good wear characteristics.
2.These rockbit balls impact test steel ball are intended for applications that require extreme toughness and strength.
3.They provide good service in withstanding the abrasion, high shock resistance, severe pressure impact, etc.
4.We manufacture a complete line of Rockbit balls in various diameters. Rockbit Balls are designed for extreme ruggedness. The rockbit balls are made from S-2 tool steel and specially heat treated to provide excellent hardness and wear resistance combined with toughness and impact resistance to survive extreme shock loads found in the drilling industry.
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Fertilization of container seedlings is usually carried out by mixing a certain proportion of N, P, K nutrients into an aqueous solution at a concentration of 1:200, and spraying or irrigating through a watering system. According to the different requirements of the seedlings in different growth stages, the N, P, K ratio and application amount are continuously adjusted to achieve the best results.
Seedling growth is generally divided into four stages: emergence stage, seedling stage, fast-growing stage and hardening stage. The emergence period refers to the period when the seedlings have just been unearthed, from the sowing to the emergence of the true leaves in the upper part of the seedlings and the lateral roots in the lower part of the ground. The seedlings in the emergence stage can not make nutrients by themselves, and the nutrient source mainly depends on the nutrients stored inside the seeds. In the seedling stage, the true leaves are present from the top of the seedlings, and the lateral roots are produced in the lower part of the seedlings until the high growth of the seedlings is greatly increased. At this time, the seedlings are sensitive to phosphorus and nitrogen, and the nitrogen fertilizer is generally applied to promote seedling growth and root growth. The fast-growing period is the most vigorous period of seedling growth, starting from a large increase in the high growth of seedlings and a significant drop in high growth. At this time, the seedlings have the most growth in the upper part of the seedlings and the roots. The most fertilizer and water are needed, and the amount and frequency of nitrogen fertilizer can be increased, and the phosphorus and potassium fertilizers are applied in proportion to promote nitrogen absorption and seedling growth. In the later stage, in order to promote the hardening of seedlings and improve their resistance, it is necessary to stop applying nitrogen fertilizer at the right time. In the hardening period of the above-ground and underground parts of the seedlings, it is necessary to prevent the lengthening, stop the application of fertilizer and improve the resistance of the seedlings.
Rooting is usually carried out in the evening, and it is not advisable to apply roots when the temperature is too high. The application of farmyard manure must be fully cooked to avoid burning the seedlings and to kill the bacteria and pest eggs in the fertilizer. The top dressing is usually 1 or 2 times a week, and it is better to do it in the morning. Compared with the root application, the root dressing has less dosage and high efficiency. Generally, the plant leaves can absorb 60% of the foliar fertilizer after 8 hours. For some trace elements, soil application is often ineffective. Therefore, the method of root dressing can be used more, and the two top dressing methods are combined. Either way, you should first fade and then thicken. Once you find excessive fertilization, you should dilute it as soon as possible.
Different types of seedlings have different nutrient requirements. In order to achieve good fertilization effects, it is necessary to determine the best solution for fertilization for different growth stages and different types of seedlings.
Biological fertilizers have obvious effects on the growth of certain seedlings, such as pine trees. However, when the pine tree is used for seedling raising, the mycorrhizal fungi are difficult to spread, and artificial inoculation should be carried out to cover the soil of the container root soil on the surface of the container soil. Generally, the mycorrhizal soil should be taken from the roots of the same pine roots. The inoculation time should be selected about one month after the germination of the pine seeds. If it is placed too early, the lateral roots of the seedlings are not formed, and the mycorrhizal fungi have no host and often fail. But bean plants, such as acacia, acacia, bauhinia, wisteria, etc., have rhizobium that can fix nitrogen, and phosphate fertilizer can promote the development of rhizobium to a large extent. Therefore, this type of seedlings has higher requirements for phosphate fertilizer and lower requirements for nitrogen fertilizer. 
Correct fertilization method for container seedling
Compared with seedling seedlings, container seedlings cannot be applied with base fertilizer, otherwise the concentration of some elements will be too high, resulting in dead seedlings. Generally, only a proper amount of compost is applied, and the effect of top dressing is also good, that is, quick-acting fertilizer is applied in combination with irrigation.
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