A5045892748- Crop Yield and Soil Fertility
- Soil Carbon and Nitrogen Dynamics
- Plant nutrient uptake and metabolism
- Remote Sensing in Agriculture
- Potato Plant Research
- Banana Cultivation and Research
- Soil and Water Nutrient Dynamics
- Soil Geostatistics and Mapping
- Growth and nutrition in plants
- Leaf Properties and Growth Measurement
- Smart Agriculture and AI
- Plant Water Relations and Carbon Dynamics
- Climate change impacts on agriculture
- Plant Pathogens and Resistance
- Plant Physiology and Cultivation Studies
- Light effects on plants
- Flowering Plant Growth and Cultivation
- Spectroscopy and Chemometric Analyses
- Greenhouse Technology and Climate Control
- Plant Stress Responses and Tolerance
- Phosphorus and nutrient management
- Plant responses to elevated CO2
- Land Use and Ecosystem Services
- Composting and Vermicomposting Techniques
- Seedling growth and survival studies
Agriculture and Agri-Food Canada
2012-2022
Saint-Jean-sur-Richelieu Research and Development Centre
2017-2022
National Association of Friendship Centres
2007-2012
Agriculture and Food
2009
Université Laval
1991-2005
Université de Montréal
2005
Université du Québec à Montréal
2005
Quebec Society for the Protection of Plants
2005
McGill University
2001
Natural Resources Canada
2001
Improvements of nitrogen use efficiency (NUE) may be achieved through the sensing tools for N status determination. Leaf and canopy chlorophyll, as well leaf polyphenolics concentrations, are characteristics strongly affected by availability that often used a surrogate to direct plant estimation. Approaches with near‐term operational sensors, handheld tractor‐mounted, proximal remote measurements considered in this review. However, information provided these is unfortunately biased factors...
<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> This paper examines the use of simulated and measured canopy reflectance for chlorophyll estimation over crop canopies. Field spectral measurements were collected corn wheat canopies in different intensive field campaigns organized during growing seasons 2004 2005. They used to test evaluate several combined indices determination using hyperspectral imagery (Compact Airborne Spectrographic...
Soil properties and weather conditions are known to affect soil N availability plant uptake; however, studies examining response as affected by sometimes give conflicting results. Meta‐analysis is a statistical method for estimating treatment effects in series of experiments explain the sources heterogeneity. In this study, technique was used examine influence parameters on corn ( Zea mays L.) across 51 involving same rate treatments that were performed diversity North American locations...
Abstract Nitrogen fertilization is considered as an important source of atmospheric N 2 O emission. A seven site‐year on‐farm field experiment was conducted at Ottawa and Guelph, ON Saint‐Valentin, QC, Canada to characterize the affect amount timing fertilizer on emission in corn ( Zea mays L.) production. Using static chamber method, gas samples were collected for 28‐days after preplant sidedress site‐year, resulting 14 monitoring periods. For both methods fertilization, peak flux...
Plant‐based diagnostic techniques are used to determine the level of crop N nutrition but there is limited comparative research on different methods. Our objectives were establish relationship between chlorophyll meter (CM) readings and index (NNI) during corn ( Zea mays L.) growing season, compare both methods as tools for predicting grain yield response fertilization. The study was established at eight site‐years using four seven fertilization rates. CM from youngest collared leaf taken...
Zhu, J., Tremblay, N. and Liang, Y. 2012. Comparing SPAD atLEAF values for chlorophyll assessment in crop species. Can. J. Soil Sci. 92: 645–648. This research had the objective of determining whether a new light transmittance meter, atLEAF, could be used as less expensive alternative to meter. Both meters measure through leaf surfaces wavelengths associated with chlorophyll, both provide an indirect method nitrogen status canopies. The current study compared under different conditions six...
Ammonia (NH 3 ) volatilization is one of the main pathways through which applied N enters environment undesirably. A seven site‐year on‐farm field experiment was performed for yr at Ottawa, ON, and 2 Guelph, Saint‐Valentin, QC, Canada. Our objectives were to (i) quantify flux amount NH as affected by rate time fertilizer; (ii) assess impact rainfall soil temperatures on volatilization; (iii) determine threshold level fertilizer large losses occur. Using static chamber method, monitored after...
Plant‐based diagnostic tools of N deficiency can be based on the concept critical dilution curves describing whole‐plant concentration (N c ; g kg −1 dry matter [DM]) as a function shoot biomass ( W Mg DM ha ). This has been tested for several crops, including winter wheat Triticum aestivum L.) but not spring wheat. Our objectives were to determine curve specific wheat, compare this with existing and assess plausibility using it estimate level nutrition. The study was conducted at six...
Plant‐based diagnostic methods of N nutrition require the critical concentration (N c ) to be defined, that is minimum necessary achieve maximum growth. A curve = 34.0 W −0.37 with being shoot biomass in Mg DM ha −1 ), based on whole plant concentration, was determined for corn ( Zea mays L.) France. Our objectives were validate this eastern Canada and assess its plausibility estimate level corn. Shoot weekly during growing season at three sites 2 yr (2004 2005); four seven treatments used...
Diagnosing nitrogen (N) sufficiency in crops is used to help insure more effective management of N fertilizer application, and several indicators have been proposed this end. The nutrition index (NNI) offers a reliable measurement, but it relatively difficult determine. This based on the relationship between plant tissue concentration biomass plant's aerial parts. However, good estimate NNI should be obtained by nondestructive methods that can carried out quickly. Although dependent sites,...
Tools to diagnose P crop status are becoming increasingly important minimize the risk of surface and groundwater contamination from excessive fertilization while still applying sufficient optimize yield. The objectives this study were establish relationship between N concentrations corn ( Zea mays L.) during growing season and, in particular, determine critical concentration required deficiency. Shoot biomass determined weekly an experiment with four six rates conducted over 2 yr (2004 2005)...
Drainage and cultivation of organic soils often result in large nitrous oxide (N 2 O) emissions. The objective this study was to assess the impacts nitrogen (N) fertilizer on N O emissions from a cultivated soil located south Montréal, QC, Canada, drained 1930 used since then for vegetable production. Fluxes were measured weekly May 2004 November 2005 when snow cover absent irrigated non‐irrigated plots receiving 0, 100 or 150 kg ha −1 as NH 4 NO 3 . Soil mineral content, gas concentrations,...
Plant nutrient status is currently diagnosed using empirically derived norms from an arbitrarily defined high‐yield subpopulation above a quantitative yield target. Generic models can assist Compositional Nutrient Diagnosis (CND) in providing cutoff value between low‐ and subpopulations for small databases. Our objective was to compute the minimum target sweet corn ( Zea mays L.) corresponding critical CND imbalance index cumulative variance ratio function chi‐square distribution function....
Abstract Dualex and SPAD are devices developed for the purpose of testing crop nitrogen (N) status. These instruments were used in a wheat experiment order to compare their respective performance assessing leaf concentration, response N topdressing application, soil nitrate (NO3)-N levels predicting grain yield. The included different rates 2005 2006 Montérégie region Quebec, Canada. readings correlated negatively with readings, NO3-N content alone ratio measurements (Chl/Phen) linearly...
Kröbel, R., Smith, W. N., Grant, B. B., Desjardins, R. L., Campbell, C. A., Tremblay, Li, S., Zentner, P. and McConkey, G. 2011. Development evaluation of a new Canadian spring wheat sub-model for DNDC. Can. J. Soil Sci. 91: 503–520. In this paper, the ability DNDC model (version 93) to predict biomass production, grain yield plant nitrogen content was assessed using data from experiments at Swift Current, Saskatchewan, St-Blaise, Quebec, Canada. While predicting yields reasonably well,...