Questions and answers on fertilization technology of oil wheat

What are the symptoms of boron deficiency in rape? How to apply boron fertilizer?

A: boron is one of the indispensable trace elements for the normal growth and development of rape. Rape needs more boron and its reaction is more sensitive. Boron deficiency in seedling stage, poor root development, few fine roots, branch roots and root hairs, swollen root neck, lack of chlorophyll in young leaves, brown and even scorched and shedding. At bud bolting stage, boron deficiency, leaf color dark green, wrinkled, leaf vein and its surrounding tissue turned yellow, purple plaque appeared and fell off early. During flowering, the apical buds of inflorescence fade to yellow, wither until withered, fall off, petals shrink, fruit clip is not dilated or deformed, ovules atrophy, can not develop into normal seeds, axillary buds germinate and turn flowers constantly. The final result of boron deficiency in rapeseed is "shrunken and unfruitful" or "flowering but unfruitful".

The method of applying boron fertilizer to rape: 0.3 kg borax per mu was used as base fertilizer and mixed with organic fertilizer. When transplanting, 0.2% borax solution was used to touch the root, which also had a better effect on increasing production. The more convenient method of boron application is foliar spraying. Spraying boron on the seedbed, spraying 50 kg of 0.1%-0.2% borax solution per mu of the seedbed 2 days before transplanting. Honda sprayed boron once at seedling stage, bolting stage and early flowering stage, each time with 50 grams of borax and 50 kilograms of water per mu. It should be noted that borax is hot water soluble and should be dissolved in hot water and then diluted to spray concentration. As the limit between the normal demand for boron and the amount of poisoning in rape is very small, the application of boron must not be excessive, otherwise it is easy to produce toxicity.

What is the fertilizer requirement and the law of fertilizer requirement of @ # @ 245 fertilizer demand?

Answer: wheat in our province is generally sown in the middle and last ten days of October, and the growth period is longer. It generally takes 210 to 230 days from sowing to maturity. Wheat is a crop that needs more fertilizer. According to analysis, under general cultivation conditions, for every 100kg wheat, it is necessary to absorb about 3 kg of nitrogen, 1 ~ 1.5kg of phosphorus pentoxide and 2kg of potassium oxide from the soil. The ratio of nitrogen, phosphorus and potassium is about 3 ∶ 1 ∶ 3. The uptake of nitrogen, phosphorus and potassium by wheat varies with variety characteristics, cultivation techniques, soil, climate and so on. The higher the yield requirements, the higher the total amount of nutrients absorbed. The amount and proportion of nutrients absorbed by wheat are different in different growth stages. The absorption of nitrogen by wheat has two peaks: one is from emergence to jointing (overwintering and returning to green stage in the north), the absorption of nitrogen accounts for about 40% of the total nitrogen; the other is from jointing to booting and flowering, the absorption of nitrogen accounts for 30% and 40% of the total nitrogen, and there is still a small amount of nitrogen absorbed after flowering. The absorption of phosphorus and potassium by wheat accounted for about 30% of the total absorption at the tillering stage, and the absorption rate increased sharply after jointing. The absorption of phosphorus was the most from booting to maturity, accounting for about 40% of the total absorption. The absorption of potassium is the most from jointing to booting and flowering stage, accounting for about 60% of the total absorption, and the absorption of potassium has reached the maximum at flowering. Therefore, in the wheat seedling stage, there should be an appropriate amount of nitrogen nutrition and a certain amount of phosphorus and potassium fertilizer to promote early tillering, early rooting and cultivation of strong seedlings. The period from jointing to flowering is the period when wheat absorbs the most nutrients in its lifetime, and more nitrogen and potassium nutrients are needed to consolidate tillers into spikes, promote strong stalks and increase grains. Adequate nitrogen and phosphorus nutrition should be maintained after heading and flowering to prevent de-fertilization and early senescence, promote the transformation and transport of photosynthates, promote full grain filling and increase grain weight.