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 the seedlings in the wheat field with poor growth, early sowing, and long defertilization, should be applied early and heavy green fertilizer, generally about 20 kg of ammonium bicarbonate in the ground when the surface begins to freeze. About 15 kg of calcium. Wheat young leaves green, leaves drape, no defermenting phenomenon, the group of larger wheat fields, generally do not apply nitrogen fertilizer or less nitrogen fertilizer, can topdressing phosphorus, potassium fertilizer 10 to 12 kg; soil fertility, planting delay, seedlings Poor growth, crops with fewer tillers per plant, and small populations of wheat fields, should cover 6-8 kg of urea per acre, and cooperate with topdressing of 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 Look at the fertility of the wheat field. The basic fertilization has higher soil fertility. If the base fertilizer is applied to a sufficient amount of organic fertilizer, the wheat should be applied with little or no nitrogen in spring, and only phosphorus and potassium fertilizers should be used. 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 rice seedlings. Fertilizer application time is generally the best time for applying jointing fertilizer in early March. Fertilizer can promote the formation of big pods, increase the percentage of spikes, promote the differentiation of spikelets and florets, and strive to obtain large spikes and grains. Top three leaf growth. 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 climate and soil moisture application method. The top dressing is conducted at noon. The fields with irrigated conditions can immediately apply the fertilizer after spreading, and the fields without irrigation conditions should be applied to the ground 5 to 8 cm underground.
(5) During the period of top-dressing top dressing fertilizer, the selected fertilizer species and spraying concentration should be determined according to the specific conditions of wheat growth, soil nutrient status and climate. General heading to the milk ripening period, such as yellow leaves color, premature aging wheat defertilizer, the focus of spraying nitrogen fertilizer, mu spray 1% to 2% of urea solution or 2% to 4% of ammonium sulfate solution 50 to 60 kg, increase production The effect is very significant. In high-yielding wheat fields with no premature aging, no topdressing nitrogen fertilizers are needed; there may be gluttonous and late-maturing wheat field crops, and no topdressing of nitrogenous fertilizers, 0.2% to 0.4% potassium dihydrogen phosphate solution or 5% turfgrass ash water per mu 50 to 60 Kg, can get a certain increase in production. Nitrogen fertilizer application of phosphorus-deficient wheat fields, spraying 2% to 4% of superphosphate solution on key acres, or 0.2% to 0.3% of potassium dihydrogen phosphate solution 50 to 60 kilograms, can also promote grain filling, increase grain weight effect. Medium and low yield wheat fields can be sprayed with nitrogen and phosphorus.
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