Wheat fertilization management

First, the amount of fertilizer needed for wheat and fertilizer requirements. Wheat in Jiangsu Province is usually planted in the middle or late October. The growth period is longer, and it generally takes 210-230 days from sowing to maturity. Wheat is a crop that requires more fertilizer. According to analysis, under normal cultivation conditions, for every 100 kilograms of wheat produced, about 3 kg of nitrogen, 1–1.5 kg of phosphorus pentoxide, and 2 potassium oxide should be absorbed from the soil. 4 kg, the ratio of nitrogen, phosphorus and potassium is about 3:1:3. The amount and proportion of nutrients absorbed by wheat during different growth periods are different. The absorption of nitrogen by wheat has two peaks: First, in the stages of emergence and jointing (overwintering and returning to the north), the absorbed nitrogen accounts for about 40% of the total nitrogen; second, nitrogen is taken up from the jointing stage to the booting stage. 30-40% of total nitrogen is still absorbed in small amounts after flowering. The absorption of phosphorus and potassium by wheat accounts for about 30% of the total absorption during the tillering period, and the absorption rate increases sharply after jointing. Phosphorus uptake is most abundant from booting to maturity, accounting for about 40% of total absorption. The absorption of potassium was the most from jointing to booting and flowering, which accounted for about 60% of the total absorption. The absorption of potassium reached maximum in flowering. Therefore, in the wheat seedling stage, there should be an appropriate amount of nitrogen nutrition and a certain amount of phosphorus, potassium fertilizer, prompting the seedlings early delivery, early rooting, strong seedlings. Jointing to flowering is the period when wheat absorbs most nutrients in its lifetime. It requires more nitrogen and potassium nutrition to consolidate tillering and spikes, and promotes strong stalk and grain growth. After heading and flowering, sufficient nitrogen and phosphorus nutrition should be maintained to prevent premature aging of defertilizer, promote the transformation and transportation of photosynthetic products, and promote grain filling and increase grain weight.

Second, the application of wheat base fertilizer. Application of wheat base fertilizer is an important measure to improve soil fertility in wheat field. Bottom fertilizer can ensure the growth of wheat seedlings on the needs of nutrients, promote early growth, so that the wheat seedlings before the winter to grow enough strong tillers and a strong root system, and lay the foundation for post-harvest growth. Bottom fertilizer also has a good effect on the stability of wheat in the medium term, the formation of spikes and the prevention of late aging. The amount of base fertilizer should be based on production requirements, fertilizer type, nature, soil and climatic conditions. The base fertilizer should account for 60-70% of the total amount of fertilizer. The base fertilizer should be dominated by organic fertilizers, and appropriate amounts of nitrogen, phosphorus, and potassium fertilizers should be applied. General Mushi farmyard fertilizer 1000-1500 kilograms, urea 10 kilograms or ammonium bicarbonate 25 kilograms, high-concentration compound fertilizer 25-30 kilograms.

Third, the application of wheat in the return fertilizer to the green period. Top dressing depends on seedlings. For Wang Miao, which has a total stem number of 1 million or more per acre before winter, due to too many tillers, dark green leaves, and leafy leaves, returning green manure should be dominated by phosphorus and potassium fertilizers. Nitrogen fertilizer. Mushi 15 kg of superphosphate, 50-100 kg of plant ash, or about 10 kg of potash, which is good for the lodging and lodging of strong stalks. For pre-winter seedlings with a total number of stems per acre of 7000,000 to 100,000, it is necessary to consolidate the pre-winter tiller, and appropriately control spring tillers to reduce ineffective tillers. Top dressing may be applied from the end of February to the end of March, and carbon is applied per acre. Ammonium 7.5-10 kg. The rice buckwheat with strong water retention and fertility can be applied as early as possible; the sandy loam or shajiang black soil with poor fertility and water conservation can be applied as late as possible. When the wheat field is a bit weak seedlings, it is appropriate to apply “eccentric” fertilizers. For weak seedlings with insufficient tillers before winter, heavy green fertilizer should be re-applied. Apply 15-20 kg of ammonium bicarbonate per acre. The application method is best for deep ditching and applying soil after application. For phosphorus-deficient wheat fields, 10-15 kg of superphosphate can be applied in the MUS.

Fourth, the jointing of wheat, the application of panicle fertilizer. Wheat from jointing to heading is the most prosperous period of growth in life. It needs large amount of fertilizer and needs more fertilizer. It is very important to seize the high yield of wheat. Jointing, panicle fat should see Miao Qiao Shi. For groups with poor wheat growth and weak seedlings, the joint fertilizer should be applied early, and the percentage of tillers and spikes should be increased so as to strive for many spikes and spikes. The topdressing amount can account for 10-15% of the total amount of fertilizer applied, and urea can be applied to 3-4 kg of furrow or acupoint per acre. For vigorously growing wheat seedlings, due to appropriate groups, the number of panicles is generally guaranteed, and the major spikes should be attacked. The joints should be properly controlled for fertilizer and water to prevent lodging, until the leaf color fades, the first internode is fixed, and the second inter-season is fixed. When it is rapidly elongating, water and fertilizer are added to increase the grain size. For large groups, large leaf area, dark green leaves, drooping leaves with large seedlings, there is a risk of lodging, mainly should control the fertilizer and water, deep middle farmland, inhibit post-natal childbirth, if conditions can be sprayed CCC, short Plants, strong stalks down. When the sword blade is exposed, if the leaf color fades, then make up the panicle fertilizer.

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