Effect of Pellet Processing of Fertilizer on Slow-Release Nitrogen in Soil

摘要

Nitrogen is an effective material for improving the crop production. Cow manure is an important resource for organic nitrogen which improves the physical condition of soil. More usage of chemical nitrogen as the fertilizer in soil has raised concerns,because some forms of nitrogen absorbs in soil and causes an increase in pollution of environmental water and costs associated with the manufacture and distribution of nitrogen fertilizer. An effective solution is to apply densification technology withmolding of manure compost into pellet and adjusting the nutrient content by adding nitrogen fertilizer. The objective of this study was to understand the response of grain yield of wheat (Triticium sp.) and its components under various levels of the portion of urea and manure as well as different compressive forces to determine the potential of slow-release of the fertilizer. The chemical fertilizer was added to the pellets within moisture content of 11 to 24% (w.b.). The results showed that density andporosity of pellets increased with increase in moisture content and applied force. The pellets absorbed moisture up 8% within 24 h depending on temperature and air relative humidity. The effects of slow-release from mixed pellets in wheat yield were also observed. Pellet processing can be used as a method for slow-release of nitrogen fertilizer that reduces leaching losses and enhanced nitrogen uptake, as well as positive effects on both health and soil nutrient levels.