Use of slow-release fertilizers also reduces leaching of nitrogen, phosphorus and potassium. The release of these nutrients depends on nutrient source, temperature, moisture and method of encapsulation. Rates of application depend on manufacturer guidelines and grower experience. Field-Grown Plants Lime and phosphorus do not move readily through the soil. Therefore, it is best to broadcast and mix them into the soil prior to planting.
Incorporation enhances soil reaction and nutrient uptake by plants.
Nitrogen and potassium are mobile in soils. Therefore, surface applications are effective. Apply fertilizers 6 to 8 inches from plants to reduce the risk of salt injury. Split applications of nitrogen and potassium also minimize the effects of leaching on sandy soils. Do not apply nitrogen after July 1 since late growth may be more subject to winter injury.