首页 | 本学科首页   官方微博 | 高级检索  
     


Soil nitrogen mineralization in a soil with long-term history of fresh and composted manure containing straw or wood-chip bedding
Authors:Mehdi Sharifi  Bernie J Zebarth  Jim J Miller  David L Burton  Cynthia A Grant
Affiliation:1. Canada Research Chair in Sustainable Agriculture, Environmental and Resource Studies Program, Trent University, Peterborough, ON, K9J 7B8, Canada
2. Potato Research Centre, Agriculture and Agri-Food Canada, Fredericton, NB, E3B 4Z7, Canada
3. Agriculture and Agri-Food Canada, Lethbridge, AB, T1J 4B1, Canada
4. Environmental Sciences Department, Faculty of Agriculture, Dalhousie University, Truro, NS, B2N 5E3, Canada
5. Brandon Research Centre, Agriculture and Agri-Food Canada, Brandon, MB, R7A 5Y3, Canada
Abstract:Long-term effects of fresh (FM) versus composted (CM) beef manure application to barley (Hordeum vulgare L.) on potentially mineralizable nitrogen (N 0 ), and mineralizable nitrogen (N) pools, were evaluated in a clay loam soil in southern Alberta, Canada. A suite of laboratory-based indices were evaluated for prediction of soil N supply. The treatments were three rates (13, 39, 77 Mg ha?1 dry wt.) of FM or CM containing either straw or wood-chip bedding, 100 kg N ha?1 as inorganic fertilizer, and an unfertilized control. Treatments were fall-applied annually for 8 years (1998–2005). Soil samples (top 15 cm) were collected in spring 2006. The medium and high rates of organic amendment resulted in increases in N 0 , and readily (Pool I) and intermediate (Pool II) mineralizable N pools in ranges of 140–355 % compared with the average of the fertilizer and control treatments. Fertilizer application had no significant effect on mineralizable N pools, but increased the mineralization rate constant (k) compared with the control. Application of FM and use of straw bedding resulted in a greater quantity of readily available and intermediate mineralizable N, and also increased the rate of N turn-over as indicated by greater values of k, compared with CM and wood-chip bedding. Among laboratory-based measures of soil N supply, CaCl2–NO3 (r2 = 0.84) and NaHCO3-205 (r 2 = 0.79) were strong predictors of plant N uptake (PNU). Increased soil mineralizable N did not translate into greater barley dry-matter yield or PNU. Composted beef manure and use of wood-chip bedding can be recommended as alternatives to FM and use of straw bedding for barley production is Southern Alberta.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号