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dc.contributor.advisorKnight, Joan D.en_US
dc.creatorSlater, Kathleenen_US
dc.date.accessioned2015-11-24T12:00:17Z
dc.date.available2015-11-24T12:00:17Z
dc.date.created2015-11en_US
dc.date.issued2015-11-23en_US
dc.date.submittedNovember 2015en_US
dc.identifier.urihttp://hdl.handle.net/10388/ETD-2015-11-2288en_US
dc.description.abstractPulse crops grown in prairie crop rotations can provide greater carbon (C) inputs than non-pulse crops in rotation and reduce nitrogen (N) fertilizer requirements. The aim of this research was to estimate the aboveground (ABG) and belowground (BG) partitioning of C and N inputs to soil from continuous (three year) chickpea (CP), lentil (L) and pea (P) systems and from CP, L and P grown in rotation with mustard (M) or wheat (W). Stable isotope techniques were used to label plants grown in a greenhouse and track residue C and N inputs to the bulk soil, heavy fraction organic matter (HF), light fraction organic matter (LF), very light fraction organic matter (VLF), water extractable organic matter (WEOM), the soil microbial biomass (SMB) and the inorganic N pool. Repeat-pulse 13CO2-labeling and shoot 15N-labeling techniques revealed rhizodeposition of C and N was higher in non-continuous pulse crop systems (P-M-CP, P-W-CP, CP-W-CP, L-W-L, P-M-P and P-W-P), than in continuous CP, L and P. Belowground residue (roots and rhizodeposits) C made up 35%, 30% and 33% of total residue C in the continuous CP, L and P, respectively. Belowground residue C made up 50%, 43% and 25% of total residue C in CP, L and P in rotation with M or W, respectively. Belowground-N made up a greater proportion of total residue N than ABG-N in the continuous CP (56%), L (53%) and P (68%) systems, and in the non-continuous CP (76%), L (70%) and P (62%) rotations. Soil pool C and N did not differ between continuous CP, L or P, nor did it differ between the non-continuous CP, L or P rotations. There were no differences between M and W, as the ABG and BG residue C and N in the M pulse crop rotations did not differ from that of the W pulse crop rotations. There was a greater amount of C derived from rhizodeposition (CdfR) and N derived from rhizodeposition (NdfR) in the bulk soil and in the very light fraction organic matter (VLF) of the non-continuous pulse crop rotations, than in the continuous pulse crop systems. This research demonstrates the importance of BG inputs of C and N to soils from CP, L and P grown in rotation with M and W.en_US
dc.language.isoengen_US
dc.subjectPulse crop, rhizodeposition, carbon, nitrogenen_US
dc.titleTHE INFLUENCE OF LEGUME CROPPING SEQUENCES ON ABOVEGROUND AND BELOWGROUND CARBON AND NITROGEN INPUTS IN PULSE CROP ROTATIONSen_US
thesis.degree.departmentSoil Scienceen_US
thesis.degree.disciplineSoil Scienceen_US
thesis.degree.grantorUniversity of Saskatchewanen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Science (M.Sc.)en_US
dc.type.materialtexten_US
dc.type.genreThesisen_US
dc.contributor.committeeMemberFarrell, Richard E.en_US
dc.contributor.committeeMemberLemke, Reynald L.en_US


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