, J. 1998. Effects of de-inking paper sludges on soil properties and crop yields. Can. J. Soil Sci. 78: 689-697. The paper mills in Quebec produce approximately 330 000 Mg of raw de-inking paper sludges (RDS) per year. These residues are rich in cellulose and lignin and may be used as soil conditioner. The effects of RDS on soil chemical properties, barley (Hordeum vulgare L. 'Chapais') growth, nutrient uptake and yields, and their residual effect on a subsequent strawberry (Fragaria × ananassa Duch. 'Kent') crop were investigated on a Tilly silt loam (Gleyed Humo-Ferric Podzol) from 1994 to 1996. Four rates of RDS (0, 15, 30 and 45 Mg ha -1 ) on a wet-weight basis were combined with four rates of supplemental N-mineral fertilizer (0, 45, 90 and 135 kg ha -1 ) as NH 4 NO 3 . The soluble inorganic N content of soil sampled 30 d after treatment application was significantly lower in plots treated with 45 Mg RDS ha -1 at all N rates. However, soluble inorganic N concentrations increased significantly with RDS rate to 20-cm depth in June 1995. The RDS application increased soil water content and Mehlich-3-extractable P, K, and Ca in the first year. Barley yields were reduced by 50% when 45 Mg RDS ha -1 was applied without supplemental N-mineral fertilizer. The amount of N-mineral fertilizer needed to overcome N immobilization resulting from RDS increased with RDS rates. Strawberry yields were not significantly affected by residual RDS or N-mineral fertilizer. Changes in plant tissue metal contents were not significant. The results of this study indicate that RDS application has a positive short-term effect on soil water, P and K availability but reduces plant-available soil N in the growing season after spring application. The RDS may be used effectively as soil amendment if the crop receives adequate supplemental N-mineral fertilizer. Par contre, l'azote minéral dans la couche de 0-20 cm de sol en juin 1995 augmentait avec la dose de BDD. Les BDD ont entraîné une augmentation de la teneur en eau et en carbone du sol lors de l'année d'application. De plus, les teneurs en P, K et Ca extractibles par la solution Mehlich-3 ont augmenté suite à l'apport de BDD. Un apport de BDD à raison de 45 Mg ha -1 a diminué le rendement d'orge de 50%. Un apport supplémentaire de N minéral a résulté en une augmentation de rendement d'orge. Les BDD n'ont pas eu d'effet résiduel sur la production de fraises. Aucune augmentation de la teneur en métaux lourds n'a été détectée dans les tissus d'orge ou de fraises. Ces résidus peuvent être considérés comme un amendement organique. Toutefois, un apport supplémen-taire d'azote minéral à la culture doit être envisagé pour éviter les problèmes de carence en N.
Impact of nitrogen fertilization on yield, hollow stem incidence and sap nitrate concentration in broccoli. Can. J. Plant Sci. 81: 765-772. This study, spanning 2 yr at two different sites, compared the effects of nitrogen fertilization on broccoli yield and quality in relation to the influence of site and production season. This research also evaluated the potential use of measuring nitrate in petiole extracts to determine broccoli nitrogen requirements when making a second fertilizer application 5 wk after transplant. Treatments consisted of factorial combinations of three nitrogen fertilization rates at transplant (N min , 50-N min and 100-N min kg N ha -1 , where N min was the soil nitrate concentration) and four nitrogen fertilization rates 5 wk after transplant (0, 50, 100 and 150 kg N ha -1 ). The marketable yield of broccoli increased with the rate of nitrogen application. Hollow stem incidence showed the same trend as yield, and was greatest when high levels of nitrogen were applied 5 wk after transplant. Interactions between the 5-wk nitrogen application and production year, as well as growing site were significant. The nitrate content of the sap was measured immediately before the 5-wk nitrogen application and 2 wk later. The nitrate concentration measured at 5 wk increased with transplant nitrogen, as did the concentration measured at 7 wk. Nitrate concentration at 7 wk increased curvilinearly with the 5-wk fertilizer application rates. Sap analysis provided clear evidence of the effect of nitrogen application rates, but Environment precluded determination of an absolute threshold of nitrate sufficiency in the sap.Key words: Brassica oleracea L. var. Italica, split application, quality, environment Bélec, C., Villeneuve, S., Coulombe, J. et Tremblay, N. 2001. Impacts de la fertilisation azotée sur le rendement, la présence de tige creuse et la concentration en nitrate de la sève chez le brocoli. Can. J. Plant Sci. 81: 765-772. Deux années d'étude sur deux sites différents ont permis de comparer les effets de l'application de fertilisants azotés sur le rendement et la qualité du brocoli par rapport à l'influence du site et de l'année de production. Cette recherche visait également à vérifier les capacités et les limites de la mesure du nitrate des extraits de pétioles dans la détermination des besoins en azote du brocoli au moment de réaliser une application complémentaire de fertilisant, 5 semaines après la plantation. Trois doses d'azote ont été appliquées à la plantation (N min , 50-N min and 100-N min kg N ha -1 , N min étant la concentration de nitrate dans le sol) et quatre doses cinq semaines après la plantation (0, 50, 100 et 150 kg N ha -1 ). Le rendement vendable du brocoli a augmenté avec les doses d'azote. L'incidence de la tige creuse a évolué dans le même sens que le rendement avec une augmentation importante reliée à l'application d'azote cinq semaines après la plantation. Des interactions significatives ont été mesurées entre les traitements et l'année de production ou le site de cultu...
N. 2005. Pelletized organo-mineral fertilizer product as a nitrogen source for potato production. Can. J. Soil Sci. 85: 387-395. Replacement of mineral fertilizer with organo-mineral fertilizer products made with animal manures is one strategy for reducing the environmental impact of agricultural production. This study evaluated a pelletized organo-mineral fertilizer product with a nutrient analysis of approximately 7-4-4 produced from composted solid poultry, solid dairy and liquid hog manure as a N source for processing potato (Solanum tuberosum L.) production in Atlantic Canada. The availability of N in the organo-mineral fertilizer product was estimated, and tuber yield, size distribution and quality parameters and soil NO 3 -N content at harvest were compared at similar application rates of N as mineral or organo-mineral fertilizer. . L'application d'un taux équivalent de N sous forme d'engrais chimique ou de fumier artificiel à la plantation donne généralement des valeurs comparables pour le rendement en tubercules, la répartition des tubercules selon le calibre, les paramètres qualitatifs et la teneur en N-NO 3 à la récolte. Les auteurs préconisent l'application de 1,5 t de fumier artificiel par hectare à la plantation et des applications fractionnées subséquentes d'engrais chimique, si besoin est, comme source de N pour la production de pommes de terre de transformation. For personal use only. Mots clés:
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.