Effect of Biochar-based Urea on Yield and Quality of Celery and Soil NO3--N Content

• Main Authors: LIAO Shang-qiang, CHEN Yan-hua, LI Yan-mei, ZHANG Lin, SUN Yan-xin
• Format: Article
• Language: zho
• Published: Agro-Environmental Protection Institute, Ministry of Agriculture 2015-10-01
• Series: Journal of Agricultural Resources and Environment
• Subjects: biochar; biochar-based urea; celery; yield; quality; N use efficiency
• Online Access: http://www.aed.org.cn/nyzyyhjxb/html/2015/5/20150504.htm

Field experiment was carried out to study the effect of biochar-based urea prepared by melt pressure(YA), water immersion(PAO) and directly mixed(HUN) methods on yield, quality of celery and NO3--N content in soil compared with urea(U) and coated urea(SU). The results showed that three kinds of biochar-based urea and coated urea significantly increased the yield of celery, the order was: PAO> YA> HUN> SU, yield increased by 18.66%, 14.90%, 10.85% and 6.73%, respectively; Biochar-based fertilizer application significantly reduced nitrate content of celery, the order was: PAO> YA> HUN> SU, reduced by 48.24%, 44.93%, 31.73%, and 29.20%, respectively; Biochar-based fertilizer increased Vc content of celery from 7.21% to 37.02% compared with urea treatment; N use efficiency of celery increased 4.71%, 9.94%, 11.10% and 6.93% respectively by application of SU, YA, PAO and HUN treatments. Additionally, biochar-based urea application could evidently decrease the quantity of soil NO3--N leached to deep soil and decrease the pollution to ground water.