The top half inch (1. 3 cm) of soil should be wet to keep as much ammonia gas in the soil as possible. You can water the soil yourself, apply the urea before it rains, or apply within 48 hours after the snow on your fields has completely melted.
Urea fertilizers can be applied directly onto potato plants, or in a solution with other fertilizers, as long as the solution is made up of 30% nitrogen or less. Solutions of urea fertilizer that are more than 30% nitrogen should only be applied to fields before potatoes are planted. [5] X Research source
Most hobbyist gardeners can find premixed fertilizers that will suit their needs at a plant nursery or garden supply center. [9] X Research source
Calcium cyanamide Sulphate of potash Sulphate of potash magnesium
Chilean nitrate Sulphate of ammonia Nitrogen magneseia Diamonnium phosphate Basic slag Rock phosphate Muriate of potash
Calcium nitrate Calium ammonium nitrate Limestone ammonium nitrate Ammonium sulphate nitrate Nitropotash Potash ammonium nitrate Superphosphate Triple superphosphate [10] X Research source
Add each of your chosen fertilizers together, according to the weights given by your fertilizer ratio. Mix them together thoroughly. This can be done in a large bucket, in a wheelbarrow, or with mechanical mixers. [11] X Research source
Urea is less dense than other fertilizers. If you are using spinning-type equipment to spread your urea-based fertilizer over large distances on your farm, keep your spread width below 50 feet (15. 2 m) to spread the fertilizer mixture equally. [12] X Research source
