|Technical and institutional issues in participatory plant breeding: done from the perspective of farmer plant breeding
McGuire, S. ; Manicad, G. ; Sperling, L.J. - \ 1999
Unknown Publisher - 100 p.
|Soluble organic carbon and carbon dioxide fluxes in maize fields receiving spring-applied manure
Gregorich, E.G. ; Rochette, P. ; McGuire, S. ; Liang, B.C. ; Lessard, R. - \ 1998
Journal of Environmental Quality 27 (1998)1. - ISSN 0047-2425 - p. 209 - 214.
More than 19 million Mg of dairy manure are produced annually in the Canadian provinces of Quebec and Ontario, and most of it is spread on agricultural fields. Quantitative information on the impact of manure management practices on levels of soluble organic carbon (SOC) and emissions of CO 2 is important for assessing whether this management significantly contributes to increasing atmospheric CO 2 concentrations. The objective of this study was to measure the effects of dairy cattle manure (applied at 0, 56, and 112 Mg ha -1) on SOC levels in, and soil surface CO 2 fluxes from, a typical maize (Zea mays L.) field in central Canada, from April to October. The higher rate of manure increased both the CO 2 emissions and the SOC levels by a factor of two to three compared with the control. Fluxes of CO 2 were very low immediately after thaw, increased sharply following manure application and increased again in mid-June at the time when temperature and sort moisture increased; thereafter, fluxes declined throughout the rest of the season. Over the season, which was drier than normal, SOC was not a good predictor of CO 2 flux. Carbon dioxide flux increased proportionately less for the second 56 Mg ha -1 increment of manure added than for the first increment. Factors other than the quantity of SOC limited soil respiration at the highest manure application rate. Carbon dioxide is contributed to the atmosphere at a lower rate, and proportionately more manure C is retained in soil with increasing levels of manure applied.
Seeds and survival: plant genetic resource management in conflict and post-war recovery.
Richards, P. ; Ruivenkamp, G. ; Drift, R. van de; Mulbah Gonowolo, ; Jusu, M.S. ; Langley, C. ; McGuire, S.J. - \ 1997
Rome : IPGRI [etc.] - ISBN 9789290433491 - 61
genetische bronnen van plantensoorten - oorlog - conflict - in-situ conservering - west-afrika - plant genetic resources - war - conflict - in situ conservation - west africa
|Seeds, intellectual property, and food security.
McGuire, S.J. - \ 1997
|Privatisation: its effects on British wheat breeding.
McGuire, S.J. - \ 1997
Biotechnology and Development Monitor (1997)32. - ISSN 0924-9877