From flowering fertilization to grain maturity, wheat generally undergoes 30-40 days, which is the last critical period for the formation of wheat yield. It is the main period for accumulating nutrients. 80-90% of carbohydrates in grains are photosynthesis after wheat flowering. 90% of the nitrogen in the grain is transferred from the stems and leaves to the kernel. Therefore, it is necessary to improve the leaf senescence, and to promote grain filling, increase grain weight, increase yield, and achieve high yield and stability. of. Pay attention to the following tasks:
I. Watering slurry, chasing slurry filling period is the final formation period of wheat grain yield, which has an important impact on high yield of wheat. In this period, there is a large demand for water, which can be combined with irrigation, and 3-5 kg ​​of urea per mu. Whether irrigation and top dressing during the filling period should also be comprehensively determined according to various factors. If there is a rainfall with a precipitation of more than 20 mm during the grain filling period, the slurry water may not be poured; if the precipitation during the filling period is small, the slurry water may be considered. Blocks with large populations, excessive growth, and risk of lodging should try not to pour the slurry without topdressing.
Wheat drought
Second, the spray surface fertilizer, anti-dry hot wind wheat root absorption capacity is weakened in the late growth stage, foliar top dressing can extend the functional period of wheat leaves, improve photosynthesis, prevent disease and fall, reduce dry heat and wind damage. Foliar spray can be carried out with 0.4% potassium dihydrogen phosphate plus 2% to 3% urea mixed solution or other ecologically active fertilizer. Re-spray once every 7 days to increase 1000-grain weight and optimize quality.
Dry hot wind causes wheat to die
Third, the prevention of pests and diseases The grain filling period of wheat is the peak period of various pests and diseases, and it is also a key period to increase the 1000-grain weight of wheat. The main control targets in this period include wheat bran and wheat powdery mildew, rust, scab and leaf blight. Grasping the key period of prevention and treatment of insects in early April in early April, for wheat scab, we must adhere to the "active attack" and unwaveringly implement the preventive and control measures in full; for the locusts, we must effectively implement the "gateway forward and pressure control". Rear". The following formulas can be used to control pests and diseases:
1, with 70% imidacloprid wettable powder 3--5 g +4.5% beta-cypermethrin EC 80 ml +45% benzyl prochloraz 25 g +98% potassium dihydrogen phosphate 100 g +0.01% brassinolide 8 ml.
2, with 50% nitenpyram wettable powder 8-10 g +4.5% beta-cypermethrin EC 80 ml +25% benzyl propionazole EC 30 ml +98% potassium dihydrogen phosphate 100 g +0.01% 芸Lactone lactone 8 ml.
3. Use 2.5% bifenthrin aqueous emulsion 80 ml + 48% cymene ester · tebuconazole suspension 10 ml + 98% potassium dihydrogen phosphate 100 g.
The above formula is mainly used for controlling aphids and powdery mildew, and treating both larvae, scab, rust, leaf blight, dry hot wind.
Severe occurrence of spikes
In addition, weeds should be removed in time. Wheat fields with malignant weeds such as wheat, wild oats, and brome. These weeds are seriously affected in the next year.
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