What are the key points for spraying foliar fertilizer on wheat?
Spraying foliar fertilizer during the wheat growing period can promptly supplement the nutrient elements needed for wheat growth and development, can achieve effects that soil fertilization cannot, and has an obvious yield-increasing effect. However, foliar spraying fertilizer must also be done properly. Below, let's take a look together with the editor at the key points of foliar fertilizer spraying on wheat.
1. Master the application time
Spraying foliar fertilizer at the booting stage to the full heading stage of wheat can obviously extend leaf function and increase single grain weight, and is the best period for fertilizer spraying. In addition, because the temperature at noon on sunny days is relatively high, water evaporation is relatively large, and the fertilizer utilization rate is low, the time for spraying fertilizer is best chosen on cloudy days or before 10 a.m. or after 4 p.m. on sunny days, when the sunlight is not so strong. If rain occurs within 24 hours after spraying fertilizer, spray once again. It is best to avoid the flowering stage when spraying fertilizer, so as not to affect the normal pollination and fertilization of wheat, thereby reducing the seed-setting rate.
2. Determine the fertilizer type and amount
Phosphorus and potassium elements can promote the synthesis and transport of nutrients in wheat, accelerate grain filling, and enhance the plant's lodging resistance; while nitrogen elements can improve grain quality and prevent premature senescence. Therefore, for wheat that grows excessively vigorously or grows normally, it is best to spray a 0.3% potassium dihydrogen phosphate solution, using 150 grams of potassium dihydrogen phosphate per mu mixed with 50 kg of water; for yellow, thin, and weak seedlings, additionally spray a 1%-2% urea solution; for vigorous seedlings with dark green leaves and dense growth, you can spray wood ash extract, taking 5-7 kg of fresh wood ash, mixing it with 100 kg of clean water, stirring it, letting it stand for 14 hours, and then taking the clarified liquid for spraying.
3. Spraying must be done properly
The fertilizer solution must be evenly sprayed on the leaves, stems, or wheat heads, and both the front and back sides of the wheat leaves should be evenly sprayed with the fertilizer solution. Spraying should be uniform, and the finer the droplets, the better. For wheat fields with severe fertilizer deficiency and poor soil moisture, or when dry hot wind occurs during the fertilizer spraying period, the number of fertilizer spraying times should be increased as appropriate.
4. Precautions
First, the types of fertilizers mixed should not be too many. In actual operation, do not apply multiple foliar fertilizers together, and do not spray one type today and then spray another type tomorrow. Foliar fertilizer application has no cumulative effect, and too many types will also affect the effectiveness. Generally speaking, choosing 1-2 types for spraying according to local conditions is sufficient. Second, the spraying time should be chosen before 10 a.m. or after 4 p.m. on sunny days, and it should be evenly sprayed on parts such as leaves, stems, and heads. It is not advisable to arbitrarily increase the pesticide concentration and dosage, so as to avoid negative effects. Third, it must be fully dissolved and sprayed immediately after mixing, avoiding exposure under strong light or application in rainy weather.
The above is an introduction to the key points of foliar fertilizer spraying on wheat. I hope it can help you. If you want to learn more related knowledge, please stay tuned to us.