Publicações - ciências agrárias
|
JASTROMBEK, JESSIANE MARY;
FAGUERAZZI, MARIANA MENDES;
DE CÁSSIO PIEREZAN, HYAN;
RUFATO, LEO;
Alessandro Jefferson Sato;
DA SILVA RICCE, WILIAN;
MARQUES, VIVIANI VIEIRA;
LELES, NATHALIA RODRIGUES;
Sergio Ruffo Roberto
Palavra-chave:
lúpulo;
Humulus
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Fitotecnia; Produção e Beneficiamento de Sementes;
CIENCIAS_AGRARIAS; Agronomia; fisiologia das plantas cultivadas
resumo ...
|
|
BARBOSA, JULIERME ZIMMER;
HUNGRIA, MARIANGELA;
PRIOR, STEPHEN A.;
MOURA, MARIA CECÍLIA;
POGGERE, GIOVANA;
Motta, Antonio Carlos Vargas
Palavra-chave:
Biodiversidade;
microbiologia do solo
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Agronomia; Ciência do Solo; Microbiologia e Bioquímica do Solo
resumo ...
|
|
MIRANDA, RODRIGO OTÁVIO VEIGA;
Afonso Figueiredo Filho;
EBLING, ANGELO AUGUSTO;
DAVID, HASSAN CAMIL;
ROIK, MAILSON
Palavra-chave:
projection models;
competition indexes
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Manejo Florestal; Dendrometria e Inventário Florestal;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Mensuração Florestal
resumo ...
|
|
PEREIRA, MILENA;
BASSACO, MARCOS VINICIUS MARTINS;
Motta, Antonio Carlos Vargas;
MAEDA, SHIZUO;
PRIOR, STEPHEN A.;
MARQUES, RENATO;
MAGRI, EDERLAN;
BOGNOLA, ITAMAR ANTONIO;
GOMES, JOÃO BOSCO VASCONCELLOS
Palavra-chave:
Nutrição florestal;
pinus;
resíduos
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Agronomia; Ciência do Solo; Fertilidade do Solo e Adubação;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Silvicultura; Solos Florestais;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Silvicultura; Nutrição Florestal
resumo ...
Nutrient return to soil by applying forest industry residues help ameliorate soil nutrient exhaustion and promote forest management sustainability. This study evaluated the effects of forest industry residue application on soil attributes, on forest floor amounts, and on growth and nutrition of Pinus taeda L. (loblolly pine). Six rates (0, 14, 25, 49, and 60 T ha−1) of residue (boiler ash and cellulose sludge mixture) were applied to P. taeda stands on a low fertility soil. Seven years after application, trees were harvested for wood volume, wood biomass, canopy mass, and nutrient composition. Wood density was determined along the trunk length. Soil samples from 0–10 to 10–20 cm depths were collected for evaluating chemical attributes. Although residue application only resulted in small increases in soil Ca and P availability, high yield enhancements were observed with no compromise to wood density. Maximum growth response was obtained with the 49 T ha−1 residue application. This rate enhanced trunk volume from 117 to 250 m3 ha−1, total biomass from 76 to 127 T ha−1, and total C from 34.5 to 57.2 T ha−1. Residue application decreased Mn content in all biomass compartments, and values above 193.5 (needles) and 26.2 mg kg−1 (bark) defined low annual growth increases. Residue application also decreased Al, Fe, S, B, Ca, and P concentrations in branches or needles. Forest floor was enhanced by residue amendment, which increased C sequestration by 7 T/ha. Forest sustainability practices can be enhanced by applications of industrial residues while improving tree yield and nutrition.
|
|
Aline Beatriz do Vale;
Afonso Figueiredo Filho;
RETSLAFF, FABIANE APARECIDA DE SOUZA;
Mauro Alessandro Karasinski
FLORESTA (ONLINE) (CURITIBA),
v. 52,
n. 2,
p. 377-383,
2022
Palavra-chave:
Plantation spacing;
biomass stock;
aboveground forest biomass;
Forest biomass assessment
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Manejo Florestal; Dendrometria e Inventário Florestal;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Manejo Florestal; Dendrometria e Inventário Florestal
resumo ...
|
|
Alfredo Junior Paiola Albrecht;
LEANDRO PAIOLA ALBRECHT;
Willian Felipe Larini;
André Felipe Moreira Silva;
Fernanda Gomes Cadamuro Galvão;
Guilherme Rossano dos Santos;
Marcelo Katakura
CHILEAN JOURNAL OF AGRICULTURAL & ANIMAL SCIENCE,
v. 38,
n. 1,
p. 13-21,
2022
resumo ...
|
|
Paulo de Tarso Cunha Chaves
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Recursos Pesqueiros Marinhos; Ictioparasitologia
resumo ...
(en)
Of particular concern in commercial fishing catch is 'size bycatch', i.e., the death of early stages of resources that would reach a marketable value when they turn into adults. This event is frequently associated with trawling because of the lower size selectivity of this gear as compared to gillnets. However, this is expected when small-scale fisheries (SSF) employ gillnets simultaneously in setnets + driftnets that mix multiple mesh sizes. This work analyzes fishing captures and compares characteristics of fish catch from gillnets and trawlers with respect to size at first maturation, legal size of capture, and expected discards. Data were obtained from 2007-2021 for SSF in Southern Brazil. A total of 112 fish species were represented in the data. Gillnets exploited fewer species than trawlers; however, most of these constitute fishing resources in the study region. Of the 19 species whose maturation size is known, nine occurred in gillnets as juveniles, and of the 14 species for which the legal size of capture is established, seven occurred in gillnets in prohibited sizes. Gillnets and trawlers presented size bycatch and affected different species between them, with four resources that were present in bycatch from both gillnets and trawlers. The broad range of mesh sizes employed by SSF warns of the discarding of undersized captures, and stresses the importance of policies addressing gillnet management.
(es)
De particular preocupación en la pesca comercial es el tamaño de los organismos en la captura incidental, es decir, la muerte de las primeras etapas de los recursos que alcanzarían un valor comercial cuando se conviertan en adultos. Este evento se asocia frecuentemente con la pesca de arrastre debido a la menor selectividad de tamaño de este arte en comparación con las redes de enmalle. Sin embargo, esto es esperable cuando en las pesquerías de pequeña escala (PPE) se emplean redes de enmalle simultáneamente en las redes de arrastre + redes de deriva que mezclan varios tamaños de malla. Este trabajo analiza las capturas pesqueras y compara las características de las capturas de peces en las redes de enmalle y en los arrastreros con respecto al tamaño de primera madurez, el tamaño legal de la captura y los descartes esperados. Se obtuvieron datos de 2007-2021 para la PPE en el sur de Brasil. En los datos estuvieron representadas un total de 112 especies de peces. Las redes de enmalle explotaron menos especies que los arrastreros; sin embargo, la mayoría de estos constituyeron recursos pesqueros en la región de estudio. De las 19 especies cuyo tamaño de maduración se conoce, nueve se encontraron en las redes de enmalle como juveniles, y de las 14 especies para las que se establece el tamaño legal de captura, siete se encontraron en redes de enmalle en tamaños prohibidos. Las redes de enmalle y los arrastreros presentaron captura incidental de tamaño y afectaron a diferentes especies en forma conjunta, con cuatro recursos que estuvieron presentes en la captura incidental tanto de redes de enmalle como de arrastreros. La amplia gama de tamaños de malla empleados por la PPE es una advertencia sobre el descarte de capturas de tamaño pequeño y enfatiza la importancia de políticas que aborden el manejo de las redes de enmalle.
|
|
MAGRI, EDERLAN;
BARBOSA, JULIERME ZIMMER;
CORRÊA, RODRIGO STUDART;
AULER, ANDRÉ CARLOS;
VALDUGA, ALICE TERESA;
Motta, Antonio Carlos Vargas
Palavra-chave:
Ilex paraguariensis;
Fertilidade do solo;
sustentabilidade agricola
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Agronomia; Ciência do Solo; Nutrição Mineral de Plantas;
CIENCIAS_AGRARIAS; Recursos Florestais e Engenharia Florestal; Silvicultura; Nutrição Florestal
resumo ...
|
|
MALTA, DANIELLE SPECHT;
DE LIMA, GABRIEL GOETTEN;
ARANTES, MATHEUS SAMPONI TUCUNDUVA;
DE LACERDA, ANDRÉ EDUARDO BISCAIA;
Alvaro Luiz Mathias;
MAGALHÃES, WASHINGTON LUIZ ESTEVES;
HELM, CRISTIANE VIEIRA;
MASSON, MARIA LUCIA
Palavra-chave:
Araucaria angustifolia;
análise de alimento;
Meio Ambiente
Áreas do conhecimento:
CIENCIAS_AGRARIAS; Tecnologia de Alimentos
resumo ...
|
|
PORTUGAL, THALES BAGGIO;
Alda Lúcia Gomes Monteiro;
SZYMCZAK, LEONARDO SILVESTRI;
DE MORAES, ANIBAL;
FONSECA, Lidiane;
Mezzalira, Jean Carlos;
SAVIAN, JEAN VÍCTOR;
ZUBIETA, ANGEL SÁNCHEZ;
Bremm, Carolina;
Paulo César de Faccio Carvalho
Palavra-chave:
manejo de pastagens
resumo ...
We assessed the effects of high-intensity and low-frequency (HILF) vs. low-intensity and high-frequency (LIHF) grazing on herbage production and performance of beef cattle grazing sorghum pastures. The experimental design was a complete randomized block with two treatments and four replicates (paddocks), carried out in 2014/15. The management target of 50 and 30 cm for pre- and post-grazing, respectively, a LIHF grazing management strategy oriented to maximize beef cattle herbage intake per unit time, was compared with a HILF grazing management strategy of 80 and 20 cm for pre- and post-grazing, respectively, aiming to maximize herbage accumulation and harvest efficiency. Sixteen Brangus steers of 15-month-old and 265 ± 21 kg of live weight (LW) were randomly distributed to paddocks (experimental units). The LIHF resulted in shorter rest periods when compared with the HILF. The greater leaf lamina mass in LIHF allowed greater sward light interception at post-grazing, resulting in greater total herbage production than HILF (7581 and 4154 kg DM/ha, respectively). The average daily gain (ADG) of steers was greater for the LIHF than for the HILF treatment (0.950 and 0.702 kg/animal, respectively); however, even with a greater stocking rate in the HILF, there was no difference for LW gain per ha, with an average of 4 kg LW/ha/day. Our findings demonstrated that the LIHF strategy that is based on offering to the animals an optimal sward structure to favor the maximum herbage intake rate fosters greater herbage production, harvesting efficiency, and ADG without compromising LW gain per area of beef steers, despite the lower herbage harvested per stocking cycle.
|
