1. Corn: The period from jointing to the big bell-mouth stage is the peak time for nutrient uptake in corn. The first topdressing should be applied around the jointing stage, with 150 kg of ammonium nitrate or 120 kg of urea per hectare. A second application should follow after about 10 days, using 225 kg of ammonium nitrate or 180 kg of urea per hectare. If the base and seed fertilizers are already rich, you can focus on one main topdressing and use a deeper application method for better results.
2. Sorghum: To meet the nutritional needs during the jointing to heading stages, apply the first topdressing at the jointing stage. Use 150-225 kg of ammonium nitrate or 120-180 kg of urea per hectare. For the second application, apply 120 kg of ammonium nitrate or 75 kg of urea per hectare to ensure continuous growth and development.
3. Rice: Nitrogen absorption in rice starts increasing gradually after the green-up stage and reaches its peak during the tillering phase. To promote early emergence and healthy growth, it's important to apply fertilizer early and reapply when needed. About 7-10 days after transplanting, apply 225 kg of ammonium sulfate per hectare, and then apply 100 kg of urea per hectare at the heading stage.
4. Wheat: Topdressing should be done during the three-leaf stage, applying 195-270 kg of ammonium nitrate or 135-180 kg of urea per hectare. In later growth stages, the root system becomes less efficient at absorbing nutrients, so foliar applications are recommended. Mix 2250 g of potassium dihydrogen phosphate with 22.5 ml of triacontanol stock solution and 300 kg of water for spraying. Alternatively, mix 3000 g of potassium dihydrogen phosphate, 15 kg of urea, and 450 kg of water for another effective spray.
5. Peanuts: The critical nutrient period for peanuts occurs before harvest. About 15 days after emergence, flower buds begin to form and nodules start developing. When two pairs of lateral branches appear, apply 150 kg of ammonium nitrate or 120 kg of urea per hectare to support growth and yield.
6. Soybeans: Soybeans have high nitrogen requirements. Apply nitrogen fertilizer at the initial flowering stage to reduce flower and pod drop, extend plant life, increase grain weight, and improve yield. Typically, 150-225 kg of ammonium nitrate or 120-180 kg of urea per hectare is recommended. A root dressing during the crusting period can further enhance production.
7. Sunflower: In addition to base fertilizer, sunflowers benefit from topdressing. Apply 225 kg of ammonium nitrate or 180 kg of urea per hectare during the budding stage. Farmers with the means can also apply foliar fertilizer during the flowering period for better performance.
8. Ramie: Timely topdressing helps ramie mature earlier and produce more. The first application can be done along with seedling establishment, using 225 kg of ammonium nitrate or 180 kg of urea per hectare. The second topdressing should occur before flowering, focusing on phosphorus to boost yield.
9. Sugar Beet: After planting, sugar beets enter a vigorous growth phase. During the early growth stage, combine with a second hoeing to apply 150-225 kg of ammonium nitrate or 120-180 kg of urea per hectare to support robust development.
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