Onion is a fertile crop, and the fertilizer requirements are potassium, nitrogen, calcium, and phosphorus. While satisfying the supply of nitrogen, phosphorus, and potassium fertilizers, it is necessary to apply calcium, magnesium, boron and other micro-fertilizers in an appropriate amount in order to meet the onion's high-quality and stable production.

1. Base fertilizer

Fully decomposed farmhouse organic fertilizer of 800 ~ 1000kg, superphosphate 28 ~ 30kg, potassium sulfate 14 ~ 15kg, can be fully mixed and fused, combined with site preparation and applied to the bottom fertilizer, the bottom fertilizer should be applied to the middle and upper layers of the cultivated land , Conducive to root absorption.

2. Topdressing

2.1 Seedling fatness.

5 to 6 days after planting, apply 600-800kg of fully decomposed farm organic fertilizer, or 10kg of ammonium sulfate, 800kg of water, and 60-80kg of phosphorus pentoxide. If the soil is too acidic, apply 400-500kg of plant ash to adjust the soil performance and benefit onion growth.

2.2 Stem and leaf fertilizer.

After slowing down the seedlings, in order to promote the growth of stems and leaves and vegetative organs, it is necessary to top-up fertilizer in an appropriate amount at the right time. Combined with cultivating, loosening soil and weeding, you can chase 10kg of ammonium sulfate, add 800kg of water, or 40-50kg of nitrogen fertilizer, spray 30-60g of Bibang liquid fertilizer and dilute with water, and spray 2-3 times every week.

2.3 Swelling fat.

At this stage, top dressing is generally performed 2 to 3 times. It can apply 10 kg of ammonium sulfate, 5 kg of potassium sulfate, 800 kg of water, or 800 kg of fully decomposed 50% human feces and urine, combined with cultivating and weeding.

2.4 Microfertilizer.

It can supplement various medium and trace elements and amino acids to ensure healthy growth of crops.