After the beginning of spring, winter wheat enters the returning green stage, followed by the tillering stage to the jointing stage. These two periods are all critical to high-yielding winter wheat. The period from the return of green wheat to the pick flag is the spring growth stage, which generally lasts for 50-60 years. Days are the key period for the formation of yields. After wheat returns to green, growth and prosperity will increase, and absorption of nutrients will gradually increase. Therefore, it is imperative to pursue joint-stocking and panicle-heading fertilizers. It is the key to promote the transformation of wheat seedlings, and the healthy growth, and it is also an important measure to ensure high yield and stable production. In view of the weak characteristics of this year's wheat, the following aspects should be taken into account when fertilizing wheat in spring:
1, see Miao fertilizer
Pre-winter poor growth, early sowing, long-fertilized wheat fields, should be applied early, heavy green fertilizer return, generally at the surface when the beginning of defrosting mu recovery of about 20 kilograms of ammonium bicarbonate, phosphorus-deficient wheat fields at the same time chasing superphosphate 15 kg or so . Wheat young leaves green, leaves drape, no de-fertilizer phenomenon, the group of larger wheat fields, generally do not apply nitrogen fertilizer or less nitrogen fertilizer, can topdressing phosphorus, potassium fertilizer 10-12 kg; poor soil fertility, sowing delay, seedlings Poor growth, crops with fewer tillers per plant, and small populations of wheat fields, should be topdressed with 6-8 kg of urea per acre and topped with superphosphate and potassium chloride 5-6 kg. For wheat fields that have more seedlings or are more prosperous than those that have not been deferred, green manure is not applied, and fertilizers are postponed until the beginning of the crop.
2, see the fertility base fertilization
High levels of soil fertility, basal fertilizer application of sufficient organic fertilizer in wheat, spring or less nitrogen fertilizer application, only the application of phosphorus and potassium fertilizers. Poor soil fertility, the amount of base fertilizer is not enough wheat should be applied to some nitrogen fertilizer, and the use of phosphorus and potassium fertilizers.
3, see the development stage of wheat seedlings set time
Generally in early March is the best time for the application of jointing fertilizer. At this time, fertilization can promote the formation of big pods, increase the percentage of spikes, promote the differentiation of spikelet and florets, and strive to obtain large grains and large grains, and at the same time promote the growth of top three leaves. For wheat fields with strong water retention and fertility, they can be applied as early as possible, and sandy loam with poor fertility and water retention can be used as appropriate.
4, see the climate and soil moisture method
The top dressing is selected for fine noon weather. The wheat fields with irrigation conditions can immediately apply the fertilizer after spreading, and the fields without irrigation conditions should be applied to the ground 5-8 cm deep.
5, outside the top dressing
During the top-dressing period, the selection of fertilizer varieties and spray concentration should be determined according to the specific conditions of wheat growth, soil nutrient status, and climate. General earing to milk ripening period, such as yellow leaf color, premature aging of deferred wheat, the focus of spraying nitrogen fertilizer, mu spraying 1%-2% urea solution or 2%-4% ammonium sulfate solution 50-60 kg, increase production The effect is very significant. In high-yielding wheat fields with no premature aging, no topdressing nitrogen fertilizer is required; cereal blocks that may be greedy and late-maturing may not be topdressed with nitrogen fertilizer, 0.2%-0.4% potassium dihydrogen phosphate solution or 5% turfgrass gray water 50-60 shall be applied per mu. Kg, can get a certain increase in production. Nitrogen fertilizers in P-deficient wheat fields, spraying 2%-4% of superphosphate solution, or 0.2%-0.3% of potassium dihydrogen phosphate solution 50-60kg in key acres, can also promote grain filling and increase grain weight. effect. Medium and low yield wheat fields can be sprayed with nitrogen and phosphorus.
End milling cutter For Manual Machine aftermarket
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Product Features
1.Material: Top quality, high hardness and high wear-resistant carbide, ultra-fine particles, good wear resistance;
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3.Quality: The roundness of the handle is 0.002mm, which greatly reduces the blade yaw during high-speed rotation.
4. Features: accurate size, cutting edge size accuracy of 0.005mm, cutting key size precision; sharp edge
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