竹炭包膜尿素的氮素释放规律和生物利用效果研究

利用竹炭和高分子聚合物为包膜材料，根据涂膜量不同制得BCCU1和BCCU2 2种竹炭包膜尿素，然后通过土壤淋溶试验、土壤氨挥发试验和盆栽试验研究了自制包膜尿素（BCCU）的氮素释放规律和生物利用效果。

Study on the Nitrogen Release Law of Bamboo Charcoal-coated Urea and Its Biological Utilization Effects

Objective]The study about the nitrngen releasing law of bamboo-charcoal coated urea and the biologic utilization effect wag to find the coated urea with high efficiency,low price and simple production technology.Method]Two kinds of bamboo-charcoal coated urea(BCCU)with different coating thickness were made by using bambon-charcoal and macromolecule polymer as coating material.The experiments of soil eluviate,ammonia volatilization in corn field and potted plant of corn were conducted to study the nitrogen releasing law and the bidngic utilization effect of self-made BCCU.Result]The BCCU showed some slow-release capability and their accumulated nitrogen releasing rates in 29 d were 9.93%-16.27% lower than that of norlnal urea.Compared With the normal urea,the volatilization rate of ammoniain BCCU reduced to 16.66%-31.8%,the biomass of Crn and nitrogen utilization rate increased by 12.8%-24.1%and 10.5%-16.99%,respectively.Conclusion]Bamboo-charcoal in coated urea not only had some slow-release capabjlity.but also had some adsorbability,Which would reducethe eluviation and volatilization of nitrogen and protect environment from N pollution.