Wheat

1. Nutritional characteristics

The vegetative growth stage of wheat includes emergence, tillering, overwintering, greening, rising and jointing, and the main goal of fertilization in this stage is to promote tillering and increase ears. The reproductive growth stage includes booting, heading, flowering, filling and maturation, and the goal of fertilization in this stage is mainly to increase grain weight.

2, need fertilizer characteristics

During the whole growth period of wheat, the amount and proportion of nitrogen, phosphorus and potassium required vary according to different factors such as soil, climate, varieties and planting methods. The yield of 500 ~ 600kg per mu requires the application of nitrogen (N) 12 ~ 14kg, phosphorus (P2O5) 6 ~ 8kg, potassium (K2O) 4 ~ 5kg.

There are two peaks of nitrogen uptake in winter wheat. The first is from tillering to overwintering, and the uptake accounts for about 20% to 25% of the total amount. In the other period, from jointing to booting, the absorption accounted for about 30% ~ 40% of the total, which was the key period to determine the size and grain weight of the ear. The absorption of phosphorus and potassium reached its peak in the stage from jointing to flowering, in which the absorption of phosphorus and potassium accounted for about 40% and 50% of the total absorption, respectively.

Wheat is especially sensitive to zinc, manganese, boron and molybdenum. Zinc deficiency seriously affected wheat yield and grain zinc quality. The leaves and stems of the plant were dark green and the veins were green, which had a great effect on the leaves and stems. Boron deficiency leads to delayed plant development, poor development of both male and female, resulting in wheat can not pollinate normally, fruit bearing, affecting yield; When molybdenum is deficient, the color of the leaves becomes pale, and small yellow and white spots appear parallel to the veins of the leaves, and gradually join into lines or sheets, and finally dry the front of the leaves. (Taken from the network, if there is infringement, please contact to delete.)

3. Fertilization technology

Base fertilizer: It is recommended to apply high nitrogen and high phosphorus special formula fertilizer (25-13-7, 25-10-5), 40 ~ 50kg per mu.

Topdressing: For areas with high yield requirements, for those with strong growth and reasonable population, it can be postponed to the jointing stage to apply urea 10 ~ 20 kg or special formula fertilizer with high nitrogen and high phosphorus type 10 ~ 15kg; For wheat seedlings with weak growth and too small population, topdressing can be appropriate in advance, and urea is applied to 5 ~ 8kg in the greening period combined with irrigation.

Ditch application or spreading, ditch application should pay attention to the separation of fertilizer and seeds, at least 8 ~ 10cm distance, to prevent burning seeds and seedlings; Spreading should be combined with ploughing into the soil.