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Spraying time: Foliar fertilization in the middle and late stages of wheat is easy to choose after no windy cloudy days or sunny days before 10 am, after 4 pm. The temperature is high at noon and should not be sprayed. Spraying should generally stagger the flowering period so as not to affect the normal pollination and fertilization of wheat. If you need to spray fertilizer during the flowering period, you should try to stagger the two peak hours of the morning flower from 9 to 11 am and from 3 to 6 in the afternoon.
Fertilizer concentration: can be selected according to the growth condition of wheat, suitable concentration is urea 1%, ammonium sulfate 2%, potassium chloride or potassium sulfate 1%, potassium dihydrogen phosphate 0.2% to 0.3%, potassium nitrate 2%, grass ash 10% (leaching solution), borax or boric acid 0.2%, zinc sulfate 0.2%, rare earth micro-fertilizer 0.03%, sodium nitrite 0.02%.
Reasonable spraying: liquid surface fertilizer mixing spray, not only saves labor and time, but also improves fertilizer efficiency. Such as nitrogen, phosphorus and fertilizer mixed spray; nitrogen, phosphorus, potassium and trace element fertilizer mixed spray; fertilizer and regulator or in line with nutrient mixing spray, etc., its fertilizer efficiency and yield increase are better than single spray. However, the preparation of the mixed liquid is not prepared by using the separately prepared solution as a mother liquid, and then adding other substances to be mixed into the mother liquid in a certain amount. After mixing the mixture, it should be sprayed in time to prevent loss of fertilizer efficiency. In the fertilizer solution, the corresponding pesticides can be added according to the occurrence of pests and diseases, and the fertilizers and drugs can be mixed and sprayed, which not only fertilizes but also treats insects.
Huaxian Agricultural University Liu Huimin
In the middle and late stages of wheat growth, the amount of fertilizer needed is large, and soil fertility is often difficult to meet. Especially in the late growth stage of wheat, the roots are senescent, the absorption function is weakened, and the fertilizer is less absorbed from the soil. If the leaf fertilization is not carried out in time, it will cause premature aging and affect the yield. . The foliar fertilization method is simple and the fertilizer efficiency is rapid, which is an important measure to ensure high yield and quality of wheat.
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