A Study on Release of Nutrients from Ash Fertilizer

To study the effect of straw ash dosage and the function of drying temperature on nutrient losses, imitate disk granulation technology was used to make ash compound fertilizer; the water immersion test was chosen to study the effect of ash on nutrient leaching characteristics of ash compound fertilizer. The results show that the total nutrient loss was the least at drying temperature of 80°C; with the rise of ash content from 15% to 20%, the release content of nitrogen and phosphorus increase, indicated that ash is able to retard the release of nitrogen and phosphorus, the dissolution rate slows down with reducing ash content, which indicates adding ash can extend the time of nutrient supply, and the effect increased with the rise of ash content.