The use of synchronous nutrient fertilizer in science requires the following steps to be mastered.
Identify fertilizer
Synchronous nutrient fertilizers are blended fertilizers containing coated controlled-release fertilizers, slow-release fertilizers, and water-soluble fertilizers. Fertilizer can be a mixture of several different colored fertilizers, and it can also be a single-color urea-aldehyde slow-release nitrogen compound fertilizer, which is more common in the former.
When purchasing, the first to determine whether it is a simple coloring fertilizer, if the coloring fertilizer is generally a pseudo-controlled slow release fertilizer, identify the coloring of the fertilizer wet hands or rub with white absorbent paper, hand or paper color, Prove to be a coloring fertilizer. Or dissolving fertilizer in water, water discoloration also proves to be coloring fertilizer. The second is to identify whether there is insoluble coated fertilizer (slow and controlled release fertilizer) in the fertilizer and whether the coated core is water-soluble fertilizer. First, a certain amount (eg 500g) of synchronous nutrient solution is dissolved in a water basin (water bucket, etc.), and the remaining granular fertilizer is observed under stirring. If the hand feeling is hard, it indicates that there may be a coated fertilizer, and the absorbent fertilizer is used. Dry it and weigh it to calculate its percentage. Then it is broken and then dissolved into water. If it can be dissolved, and there are obvious resin shells remaining, this part of the fertilizer is not only a resin-coated slow- and controlled-release fertilizer, but the core fertilizer is a completely water-soluble fertilizer. At this point, it can be seen that the selected fertilizer is a synchronized nutrient fertilizer containing a controlled-release fertilizer, and the ratio of the nutrient slowly and controlledly released therein is calculated.
Select fertilizer and application period
For the grass crops with a growth period of 3 to 4 months, for example, corn is recommended to use slow-release nitrogen nitrogen compound fertilizers, such as the Northeast corn 27-12-12, 26-11-15 or similar compound fertilizer. Slow release urea accounts for 10% to 15% of the compound fertilizer.
For crops with a growing period of one year, it is recommended to apply two kinds of slow- and controlled-release nitrogen and high-nitrogen compound fertilizers (such as 22-8-15, for bananas) twice at the seedling stage of the crop (main long-rooted shoot and leaf stage). Before flowering, the application of slow- and controlled-release N-nitrogen-N type potassium compound fertilizer (such as 14-6-25, banana-specific) and slow-release NPK K-type high-potassium compound fertilizer in the late growth stage (fruiting fruit to early fruit expansion) Fertilizer (eg 12-5-30, banana only).
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