. 1998. Comparison of four organic amendments with a chemical fertilizer applied to three vegetables in rotation. Can. J. Plant Sci. 78: 641-646. Field research, conducted for six seasons (1991)(1992)(1993)(1994)(1995)(1996) on one soil type, compared organic amendments (three formulations of fish bone meal (FBM) and a marine sediment enriched with fish, lobster, and crab meal) with an NPK chemical fertilizer (17-17-17) and a zero-N control (0-17-17). Each fertilizer material was applied preplant at 80 kg N ha -1 to the same plot for six seasons that spanned two cycles of a three-crop rotation of seeded carrots, green beans, and transplanted cabbage. In plots receiving the organic amendments, soil pH and Ca increased over time compared with those plots receiving 17-17-17. The increase of soil Mg was greatest in plots receiving the fortified marine sediment treatment. Soil and leaf K values were lowest with the FBM treatment, reflecting its low K composition (6-10-1). Soil and foliar P values from the organic amendment plots were higher than those from the 17-17-17 plots. Foliar N, Ca, Mg, Fe, and B were not consistently affected by 17-17-17 or the organic amendments, but foliar Mn was higher in crops receiving 17-17-17. Marketable yields of cabbage and carrots in plots receiving the organic amendments were comparable with those from 17-17-17, but marketable yields of green beans were consistently higher in plots receiving 17-17-17. Soil and foliar results indicate that the cumulative effect of repeated application of these organic amendments is not detrimental to plant growth, and that these amendments produce marketable yields of cabbage and carrot equivalent to those of the chemical fertilizer. . Dans les parcelles recevant les fertilisants organiques, le pH et la teneur en Ca du sol augmentaient en fonction du temps par rapport aux parcelles fertilisées au 17-17-17. L'accroissement le plus prononcé de la teneur en Mg du sol se manifestait dans le traitement au sédiment marin enrichi. Les teneurs en K du sol et des feuilles atteignaient leur niveau le plus bas dans le traitement à la farine d'arêtes, résultat de la faible composition en K de cette préparation : 6-10-1. Les concentrations de P dans le sol et dans les feuilles étaient plus hautes dans les parcelles traitées aux fertilisants organiques que dans celles recevant le 17-17-17. Les teneurs foliaires en N, Ca, Mg, Fe et B ne démontraient pas de différences soutenues selon qu'on employait l'engrais minéral ou un fertilisant organique, mais les teneurs en Mn étaient plus élevées avec le premier. Les rendements marchands de choux et de carottes dans les parcelles avec fumure organique étaient comparables à ceux obtenus avec le 17-17-17 mais ceux du haricot étaient régulièrement plus élevés avec l'engrais minéral. Il découle de ces observations que l'effet cumulatif d'apports répétés de ces fertilisants organiques ne cause pas de faits adverses sur la croissance des végétaux et que les rendements marchands de choux et de carottes qu'on en retire équiv-alen...
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