Talking about fertilization of wheat, first look at the "law of casks" and the "law of fertilizer requirements" of wheat, which is the basis of scientific fertilization.
The barrel law is also called “minimum nutrient law†and “water†stands for yield. Different lengths of wood represent a large number of nitrogen, phosphorus, and potassium elements, and trace elements such as zinc, boron, manganese, molybdenum, copper, and iron. Generally, mid-weight elements are not considered. Because a large number of elements and trace elements contain different intermediate elements, such as potassium sulfate contains 18% of sulfur. The level of wheat production depends on one element (shortest wood board) with the smallest relative amount (content). The current arable land in China is generally lacking in potassium and trace elements.
Fertility regulation law for wheat: For every 500 kg of dry matter produced by wheat, it needs to absorb 10.5 g of pure zinc, 9 g of pure boron, 13 g of pure manganese, 0.44 g of pure molybdenum, and 4 g of pure copper. The amount of trace elements is small, but it is missing. One, the output will be greatly reduced. For every 500 kg of grain produced by wheat, 13-15 kg of pure nitrogen, 5-8 kg of pure phosphorus, and 7.5-11.5 kg of pure potassium are required. Considering factors such as straw return, fertilizer utilization, and differences in fertility of different plots, experts suggest that wheat should be sowed with 7.5-11.5 kilograms of pure nitrogen (9-11 kilograms of pure nitrogen), and pure phosphorus 6.5-10.5. Kg, pure potassium 7.5-10 kg.
The nutrient uptake pattern of wheat: The amount of nutrients needed to be absorbed before the green stage accounts for the total amount of fertilizer, about 1/6 of the nitrogen, 1/8 of the phosphorus, and 1/10 of the potassium. About 65% of nitrogen, 45% of phosphorus, and 85% of potassium are required before heading (approx. 25% from the start-up period to the jointing stage, and 60% from the jointing period to the draw period). About 20% of nitrogen and 40 are required after heading. % of phosphorus. Phosphorus has small mobility and large aftereffect. The utilization rate of phosphate fertilizer applied to the whole layer of the tillage layer is 340% higher than that of concentrated application. It is better to use phosphate fertilizer as base fertilizer for one-time application. Potassium is about 85% before it gets up to heading. Potassium fertilizer can be used as a one-time, all-bottom or 1/3 bottom application, and 2/3 can be applied in combination with topdressing nitrogen fertilizer at the jointing stage. Because of the low mobility of potassium in the soil and the increased labor costs, it is advisable to use a one-time base before wheat sowing. The best application of nitrogen fertilizer is about 1/3, and it is advisable to apply 2/3 or so from the jointing stage. The corn stalks returning to the field still need 4-8 kilograms of pure nitrogen to decompose the straw.
The author proposes that the ratio of wheat base fertilizer should be 15 kg of urea per mu (substituting 17 kg of ammonium bicarbonate and 50 kg of nitrogen), 15 kg of diammonium phosphate, 15 kg of potassium chloride, and about 110 yuan per mu. The total N, P and K fertilization is 25.5 kg. On this basis, attention should be paid to the application of urea and foliar fertilizer in a timely manner during the growing season. If the grower has micro-irrigation equipment, it can also use 1/2-2/3 of the potash fertilizer in the base fertilizer, and apply it in combination with topdressing nitrogen fertilizer in the spring.
At present, the “stolen content†of compound fertilizer is more common. How can we avoid it? Asked the distributor for fertilizer nutrient test report. If not, it is worthwhile to spend money on testing yourself, otherwise the loss caused by the reduction in production will be significant.
Disposable Latex Gloves,Disposable Vinyl Gloves,Nitrile Glove,Latex Glove
ZHANGJIAGANG DINSHENGLIN TRADING CO.,LTD , https://www.dslhouse.com