期刊
PLANT AND SOIL
卷 371, 期 1-2, 页码 67-80出版社
SPRINGER
DOI: 10.1007/s11104-013-1626-z
关键词
Crop residues; Rhizodeposition; Roots; N-15 isotope techniques
资金
- Agriculture and Agri-Food Canada through the Agricultural Bioproducts Innovation Program (ABIP)
- Saskatchewan Pulse Growers
- Saskatchewan Ministry of Agriculture Strategic Research Program-Soil Biological Processes
- Natural Sciences and Engineering Research Council of Canada
Crop species grown in a diversified crop rotation can influence soil N dynamics to varying degrees due to differences in the quantity and quality of the residues returned to the soil. The aim of this study was to quantify the contribution of N rhizodeposition by canola (Brassica napus L.) and pea (Pisum sativum L.) to the crop residue N balance and soil inorganic N pool. Canola and pea were grown in a soil-sand mixture and were subject to cotton-wick N-15 labeling in a greenhouse experiment. Nitrogen-15 recovered in the soil and roots were used to estimate N rhizodeposition. Belowground N, including root N and N rhizodeposits, comprised 70 % and 61 % of total crop residue N for canola and pea, respectively. Canola released the greatest amount of total root-derived N to the soil, which was related to greater root biomass production by canola. However, root-derived N in the soil inorganic N pool was greater under pea (13 %) than canola (4 %). Our results show a significant belowground N contribution to total crop residue from pea and canola. Further investigation is required to determine whether input of the more labile N rhizodeposits of pea improves soil N supply to succeeding crops or increases the potential for N loss from the soil system relative to canola.
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