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Registros recuperados: 8
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Absorption of macronutrients by cassava in different harvest dates and dosages of nitrogen Rev. Ciênc. Agron.
Santos,Nádia Souza dos; Alves,José Maria Arcanjo; Uchôa,Sandra Catia Pereira; Oliveira,Natália Trajano de; Albuquerque,José de Anchieta Alves de.
A field experiment was carried out in 2010-2011 crop years in the experimental area of the Centro de Ciências Agrárias of the Universidade Federal de Roraima, in Boa Vista, Roraima, Brazil. This study aimed to evaluate the effect of nitrogen availability on the concentrations of N, P, K, Ca, Mg and S in cassava, cultivar Aciolina, in different harvest times. A randomized block design was used in split-plot, with four replications. Dosages of N in cover were applied randomly on the plots (0, 30, 60, 150 and 330 kg ha-1), and in the subplot the harvest dates 120, 150, 180, 210, 240, 270 and 300 days after emergence (DAE). The vegetal material was collected, ground and then underwent an analysis for determination of nutrients concentrations in the leaves (N,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fertilisation; Manihot esculenta; Plants-Nutrition; Plants-Nitrogen effect.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902014000400001
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Application des recherches de fertilisation et stimulation dans l'élevage de la crevette impériale (Penaeus japonicus) ArchiMer
Hussenot, Jerome.
Ce travail est la première mise en application du savoir-faire acquis par le CREMA-L'Houmeau sur la stimulation de bloom phytoplanctonique par fertilisation organo-minérale, effectuée dans un bassin de production de crevette impériale de 8000 m2. (...)
Tipo: Text Palavras-chave: Marais; Aquaculture; Penaeus japonicus; Fertilisation.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/00020/13116/10125.pdf
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Brassica oleracea var. costata: comparative study on organic acids and biomass production with other cabbage varieties IPB - Escola Superior Agrária
Sousa, C.; Pereira, D.M.; Taveira, M.; Dopico-García, S.; Valentão, P.; Pereira, J.A.; Bento, Albino; Andrade, P.B..
BACKGROUND: A study was undertaken to evaluate the effect of agronomic practices, harvesting time and leaf age on the organic acid composition and biomass production of Brassica oleracea L. var. costata DC (tronchuda cabbage). Samples were cultivated under eight different fertilisation regimes (two levels each of nitrogen, boron and sulfur, an organic fertiliser and no fertiliser) and collected at three different times. RESULTS: Principal component analysis of the data indicated significant differences. Three principal components with an eigenvalue higher than one accounted for 79.0% of the total variance of the data set. Samples obtained with conventional fertilisation were characterised by the highest values of fresh weight. External leaves showed higher...
Tipo: Article Palavras-chave: Brassica oleracea L. var. costata DC; Organic acids; Fertilisation; Principal component analysis.
Ano: 2009 URL: http://hdl.handle.net/10198/3046
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Evolution de communautés phytoplanctoniques après fertilisation modérée ArchiMer
Jacques, G.; De Billy, G..
One approach to the problem of aquaculture consists in a simple acceleration of natural processes in extended areas of salt or brackish water. From this point of view, the authors have been in­terested in the effect of moderate fertilization on natural communi­ties . A first series of experiments (8) was made in an exter­nal tank of 3000 liters. After fertilization, the development of flowering diatoms was obtained each time. The time of latency, the level of production reached, the composition of the final communities is to some extent variable, but bacterial development may be neglec­ted. In contrast to earlier results, obtained in small volumes of water, these experiments have always led to simplified communities mostly dominated by the diatom...
Tipo: Text Palavras-chave: Phytoplancton; Fertilisation; Chémostat.; Phytoplankton; Nutrient; Enrichment; Chemostat.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/00306/41688/40897.pdf
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Pasture improvement in the Mediterranean mountains of the Northeast of Portugal. Yield and botanical composition IPB - Escola Superior Agrária
Pires, Jaime; Fernandes, Adelaide; Pires, João; Moreira, Nuno.
Amélioration pastorale dans les montagnes méditerranéennes du Nord-est du Portugal: Production et composition botanique". Pour étudier I'amélioration de prairies dans les montagnes méditerranéennes sans irrigation du Nord-est du Portugal trois techniques ont été comparées : végétation spontanée, végétation spontanée plus fertilisation et prairie semée plus fertilisation. Cette expérience a été déclinée dans six localités différentes et sous plusieurs conditions environnementales. Les productions saisonnieres et annuelles, et la composition botanique (graminées, légumineuses, autres fami/les et sol nu) sont présentées pour la période 1998-2000. Les prés les plus fertilisés ont donné les productions les plus élevées. Les différences entre les trois...
Tipo: Article Palavras-chave: Amélioration pastorale; Fertilisation; Graminées; Légumineuses; Rendement; Couvert.
Ano: 2004 URL: http://hdl.handle.net/10198/5289
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Setting of a procedure for experimental fertilisation of Pacific oyster (Crassostrea gigas) oocytes ArchiMer
Song, Yun-peng; Suquet, Marc; Queau, Isabelle; Lebrun, Luc.
The quality of oyster spermatozoa has become an issue for modern aquaculture. However, reliable protocols used to assess gamete quality are lacking. The aim of this work is to define a standardised experimental fertilisation protocol for Pacific oyster oocytes. Six experiments have been carried out in this study. The optimal conditions for Pacific oyster experimental fertilisation have been defined: (1) oocytes can be conserved in seawater for at least 4 h before fertilisation. (2) oocyte concentration: 100-1000 ml(-1) seawater, (3) fertilisation volume: 10-100 nil, (4) spermatozoa: oocyte ratio: 400 to maintain discriminating conditions, (5) gamete contact time: longer than 10 mill and (6) fertilisation and incubation temperatures: both 19 degrees C. The...
Tipo: Text Palavras-chave: Crassostrea gigas; Pacific oyster; Experimental; Fertilisation.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6231.pdf
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Techniques d'utilisation de la silice pour la production de masse des algues diatomées ArchiMer
Hussenot, Jerome; Gautier, Dominique.
Le document résume les différentes expérimentations menées au CREMA en laboratoire ou sur le terrain pour améliorer la dissolution du silicate de sodium dans l'eau de mer.
Tipo: Text Palavras-chave: Silicium; Silicate de sodium; Fertilisation; Culture de diatomées; Aquaculture marine.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00020/13118/10127.pdf
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Utilisation des engrais en ostréiculture ArchiMer
Ladouce, Rémy.
Les études commencèrent en 1870 avec les recherches des frères MONTAUGE. Elles se poursuivirent avec les travaux de CHATIN et MUNITZ sur l'importance de la nourriture de l'huître, puis les essais de HEYMANN, les expériences de DANTAN et de G. HINARD de PERAGALLO. Elles ne reçurent aucune application pratique. En 1942, F. GROSS, J. E. G. RAYMOND, S. M. MARSHALL et A. P. ORR constataient les variations du plancton dans les lochs d'Ecosse en fonction des saisons. De plus, en disolvant du nitrate de soude et du superphosphate, puis du sulfate d'ammoniaque, ils obtenaient un enrichissement général en phytoplancton ; l'été le zooplancton augmentait considérablement, et notamment, les moules grossissaient et pullulaient rapidement.
Tipo: Text Palavras-chave: Ostréiculture; Engrais; Fertilisation; Claires; Engraissement; Parcs; Etang.
Ano: 1953 URL: http://archimer.ifremer.fr/doc/00003/11469/8027.pdf
Registros recuperados: 8
Primeira ... 1 ... Última
 

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