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Search Results: 1 - 10 of 50601 matches for " Fancelli Antonio Luiz "
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Comportamento de espécies de adubos verdes em diferentes épocas de semeadura e espa?amentos na regi?o dos Cerrados
Amabile, Renato Fernando;Fancelli, Antonio Luiz;Carvalho, Arminda Moreira de;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000100007
Abstract: in 1991/1992 growing season, three field experiments were carried out to evaluate the growth and development of sunn (crotalaria juncea), crotalaria ochroleuca, black velvet bean (mucuna aterrima), pigeon pea cv. kaki (cajanus cajan) as green manures at three sowing dates and two row spacings at embrapa-centro nacional de pesquisa de solos (cnps), senador canedo, go, brazil. the experimental design used was a complete randomized block with split-plot and three replicates. highest yields of dry matter were obtained with c. juncea and c. cajan. the delay in sowing dates to the beginning of the rainy season, reduced yield of fresh and dry matter of all legume species, except black velvet bean. row-spacings of 0,5 and 0,4 cm did not influence the time for flowering and the yield of fresh and dry matter.
Comportamento de espécies de adubos verdes em diferentes épocas de semeadura e espa amentos na regi o dos Cerrados
Amabile Renato Fernando,Fancelli Antonio Luiz,Carvalho Arminda Moreira de
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Com o objetivo de avaliar o crescimento e desenvolvimento de leguminosas utilizadas como adubos verdes, instalaram-se três ensaios, em três épocas de semeadura e dois espa amentos na regi o dos Cerrados, durante o ano agrícola de 1991/1992, na área experimental da Embrapa-Centro Nacional de Pesquisa do Solo (CNPS), em Senador Canedo, GO. As espécies avaliadas foram Crotalaria juncea L., mucuna-preta (Mucuna aterrima (Piper & Tracy) Merr.), guandu cv. Kaki (Cajanus cajan (L.) Millsp.) e Crotalaria ochroleuca G. Don. O delineamento experimental utilizado, dentro de cada época, foi o de blocos ao acaso com parcelas subdivididas, com três repeti es. Os resultados indicaram que C. juncea e C. cajan apresentaram as maiores produ es de fitomassa seca. O atraso da semeadura, em rela o ao início da esta o chuvosa, reduziu os rendimentos de fitomassas verde e seca produzidos pelas leguminosas, exceto pela mucuna-preta. Os espa amentos de 0,5 m e 0,4 m n o influenciaram o período para o florescimento e as produ es de fitomassas verde e seca.
Efeito de herbicidas e fungicidas nas curvas de progresso e quantifica??o de danos causados pela ferrugem asiática da soja
Tsumanuma, Guy Mitsuyuki;Soares, Ana Raquel;Fancelli, Antonio Luiz;Rodrigues, Marco Antonio Tavares;Begliomini, Edson;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010005000123
Abstract: phakopsora pachyrhizi sydow & sydow is the worst threat for soybean crop in the most important growing regions around the world, where great losses were observed. many variables are studied in the quantification of damage such as area under the disease progress curve (audpc), healthy leaf area absorption (haa), healthy leaf area duration (had), in addition to disease progress curves. the present research aimed to evaluate the effect of several herbicides and fungicides on the progress of the disease and its implications for variables related to healthy leaf area and yield. the treatments were evaluated in two cultivars (mg/br-46 conquista e brs valiosa rr): 1. control; 2. control with herbicides; 3. herbicides and pyraclostrobin (v4) + pyraclostrobin+ epoxiconazole (r2 and r5.1), 4. herbicides and pyraclostrobin (v4) + epoxiconazole (r2 and r5.1). 5. herbicides (v4) + pyraclostrobin + epoxiconazole (r2 and r5.1). the herbicides used in mg/br-46 conquista were sethoxydim, bentazon and chlorimuron-ethyl; in brs valiosa rr, glyphosate was used. the logistic was the model that best adapted to the mean severity ratings and the disease progress curve. at the bottom of canopy, position more favorable to this disease, the logistic model with variable rate was the model that better explain the data. the spraying of strobilurin's group associated with triazole (pyraclostrobin + epoxiconazole) reduced the rate of asian rust development, in relation to the group of ergosterol biosynthesis inhibitors fungicide (epoxiconazole). the pyraclostrobin + epoxiconazole influenced the variables audpc, haa and had, and these can be considered suitable to quantify damage caused by this disease. in mg/br-46 conquista, the herbicides action affects temporarily the leaf area, affecting indirectly the haa and had variables.
Balance hídrico ciclico y secuencial : estimación de almacenamiento de agua en el suelo
Dourado-Neto Durval,García y García Axel,Fancelli Antonio Luiz,Frizzone José Antonio
Scientia Agricola , 1999,
Abstract: El presente trabajo tiene por objetivo presentar un modelo mecanístico para estimar el almacenamiento de agua en el suelo, con el propósito de prever el rendimiento agrícola para cultivos anuales no fotosensibles. El movimiento y la retención de agua en el sistema agrícola, son los atributos de interés en el estudio. El rendimiento agrícola depende de los procesos básicos de fotosíntesis y respiración. También, el rendimiento depende de la especie vegetal, nutrición de la planta, energia disponible, población de plantas, plantas da inas y población de parásitos, principalmente. Además, la evapotranspiración actual también depende de los mismos atributos y procesos. Por lo tanto, la hipótesis base del modelo es que es posible estimar el rendimiento estimando la evapotranspiración. Conociendo empíricamente el comportamiento de pérdida de agua del suelo, sin conocer todos los atributos y las complejas interrelaciones que lo gobiernan, el modelo cosenoidal fue propuesto para estimar el almacenamiento de agua en el suelo. El modelo cosenoidal fue comparado con otros modelos y se concluye que el mismo estima mejor el almacenamiento de agua en el suelo.
Crescimento de dois cultivares de soja submetidos a aplica??es de herbicidas e fungicidas
Tsumanuma, Guy Mitsuyuki;Carvalho, Saul Jorge Pinto de;Fancelli, Antonio Luiz;Bernardes, Marcos Silveira;Rodrigues, Marco Antonio Tavares;Begliomini, Edson;
Revista Ceres , 2010, DOI: 10.1590/S0034-737X2010000600007
Abstract: pesticide application may change crop growth and metabolism, leading to negative or positive consequences. strobilurin fungicides have been reported to increase soybean yield even without incidence of diseases, suggesting that physiological changes should be investigated. the objective of this study was to evaluate the growth of two soybean cultivars (mg/br46 conquista and brs valiosa rr) subjected to herbicide and fungicide (strobilurin and/or triazole) applications. two field trials were carried out with treatments arranged in a split-plot in time design (5 x 12), with five herbicide combinations (glyphosate at 720 g ha-1 or sethoxydim (230 g ha-1) + bentazon + chlorimuron-ethyl (480 + 11,25 g ha-1)) and fungicides (pyraclostrobin a 75 g ha-1, epoxiconazole a 50 g ha-1 or pyraclostrobin + epoxiconazole (66,5 + 25 g ha-1)) in the plots; and the dates of evaluation were considered as the split-plots, varying between 30 and 120 days after sowing. herbicide application did not affect the growth of soybean cultivars. application of the strobilurin group combined with triazole fungicides increased dry mass and leaf area accumulation. the application of these fungicides on r2 and r5.1 increased agr, rgr, nar and cgr near to the end of the crop cycle, which was different even from the treatments with single triazole applications.
Balance hídrico ciclico y secuencial: estimación de almacenamiento de agua en el suelo
Dourado-Neto, Durval;García y García, Axel;Fancelli, Antonio Luiz;Frizzone, José Antonio;Reichardt, Klaus;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000300005
Abstract: the objective of this paper is to present a mechanistic model to estimate the available soil water storage to forecast yield for nonphotosensitive annual crops. in this study, concern is devoted to the movement and retention of water within the agricultural system. crop yield depends upon the basic processes of photosynthesis and respiration. the yield also depends on crop species, crop nutrition, available energy, plant population, weeds and parasite populations, mainly. in addition, actual evapotranspiration also depends on the same attributes and processes. therefore, the basic hypothesis of this model is that it is possible to forecast crop yield with estimates of actual evapotranspiration. knowing empirically the process of soil water loss, but without knowing all attributes and their complex relations ruling this behavior, a cosine model was established to estimate available soil water storage. the cosine model was constructed and checked together with other models and the conclusion is that the cosine model best estimates soil water storage.
Características químicas de solo e rendimento de fitomassa de adubos verdes e de gr?os de milho, decorrente do cultivo consorciado
Heinrichs, Reges;Vitti, Godofredo César;Moreira, Adonis;Figueiredo, Paulo Alexandre Monteiro de;Fancelli, Antonio Luiz;Corazza, Edemar Joaquim;
Revista Brasileira de Ciência do Solo , 2005, DOI: 10.1590/S0100-06832005000100008
Abstract: green manure is one way of supplying organic matter to soil. the mixed cultivation of crops may be an alternative to increase nutrient cycling and to improve productivity. to evaluate intercrops of green manure and corn, soil chemical characteristics, green manure dry matter production and its mineral composition and corn yield were determined in a field experiment carried out between 1995 and 1997 on an aleudalf soil in piracicaba, state of s?o paulo, brazil. corn was sown in rows spaced 90 cm apart to obtain approximately 50,000 plants per hectare. the treatments consisted of four green manure species: dwarf mucuna [mucuna deeringiana (bort.) merr], dwarf pigeon pea (cajanus cajan l.), crotalaria (crotalaria spectabilis roth), jack bean (canavalia ensiformis l.), plus a control without green manure. green manure species were sown without fertilizer application in a single row in-between the rows simultaneously with corn or 30 days after corn sowing. the experimental design consisted of randomized blocks in split plots and four replicates. jack bean produced most phytomass and accumulated the highest amounts of n, p, k, ca, mg, and s. in the first year of cultivation, the corn yields were not affected by the intercropped cultivation with green manure, but in the second year the yield was highest when corn was intercropped with jack bean.
Produtividade do Panicum maximum cv. Momba a irrigado, sob pastejo rotacionado
Müller Marcela dos Santos,Fancelli Antonio Luiz,Dourado-Neto Durval,García y García Axel
Scientia Agricola , 2002,
Abstract: O uso da irriga o em pastagens é uma realidade fundamentada na experiência empírica de produtores, devido à falta de bases científicas definidas sobre o assunto. O trabalho visou avaliar a produtividade do capim Momba a (Panicum maximum Jacq. cv. Momba a) manejado em pastejo rotacionado, sob sistema de irriga o e as principais variáveis climáticas responsáveis pelo acúmulo de massa de forragem. O experimento foi conduzido sob irriga o por aspers o tipo piv central, de julho a dezembro de 1998, em regi o de cerrado (Latossolo Vermelho-Amarelo) em S o Desidério, BA. Foi quantificada a massa de forragem da pastagem aos 30 dias de crescimento e antes do pastejo e desenvolvidos modelos matemáticos que relacionam a produ o de forragem a variáveis climáticas. A produ o e a taxa de acúmulo de matéria seca da pastagem, ao longo do período de inverno n o apresentaram diferen as significativas. Na primavera, houve tendência de aumento em ambas, com maiores produ es obtidas no período final de avalia o. As menores taxas de acúmulo durante a primavera foram observadas nos primeiros piquetes, coincidindo com a ocorrência de baixas temperaturas durante o período de descanso. Com a eleva o da temperatura mínima, a produ o forrageira entrou em fase de acúmulo crescente. A produ o de forragem, durante a primavera, foi superior à do inverno, apresentando incrementos em fun o da maior temperatura mínima do ar, do período de descanso e da área foliar inicial. As principais variáveis climáticas responsáveis pela produ o da forragem foram temperatura mínima do ar e disponibilidade de água no solo.
Produtividade do Panicum maximum cv. Momba?a irrigado, sob pastejo rotacionado
Müller, Marcela dos Santos;Fancelli, Antonio Luiz;Dourado-Neto, Durval;García y García, Axel;López Ovejero, Ramiro Fernando;
Scientia Agricola , 2002, DOI: 10.1590/S0103-90162002000300003
Abstract: irrigation of tropical grasses is a reality based on the empirical knowledge of farmers, having no scientific evidence. this field experiment was carried out to evaluate the productivity of the momba?a grass (panicum maximum jacq.cv. momba?a) under rotational grazing and center pivot irrigation, and the main weather attributes responsible for increases of the momba?a dry mass yield. the experiment was carried out from july to december 1998, in the central brazilian savannah region (typic haplustox), s?o desidério, bahia, brazil. the momba?a forage mass was measured at 30 days of growth and before each grazing. mathematical models were developed to relate the forage productivity to weather attributes. the dry mass yield and the rate of growth, during the winter season, were not statistically different. even though, both of them increased during the spring season, with the higher dry mass yield at the end of the experimental evaluation period. the lower growth rates, during the spring season, were observed in the initial period, corresponding to lower air temperatures during the pasture rest period. with the increase of the minimum air temperature, the dry mass yield also increased. the forage yield was higher during the spring season as compared to the winter season, because of the higher minimum air temperature during the rest period, and of the initial leaf area. at the savannah region, the main attributes responsible for increasing the momba?a dry mass yield were minimum air temperature and soil water availability.
Oviposi??o e dispers?o de ninfas de Bemisia tabaci biótipo B em genótipos de tomateiro
Fancelli, Marilene;Vendramim, José Djair;Louren??o, André Luiz;
Bragantia , 2008, DOI: 10.1590/S0006-87052008000400016
Abstract: several methods have been employed for evaluating plant resistance to whiteflies. although, a few researches have been conducted aiming to determine the whitefly nymphal dispersion on crops. the objective of this work was to evaluate the oviposition of b. tabaci biotype b and nymphal dispersion in leaflets with and without exudates on tomato genotypes. seven genotypes were used: la716, la1739, pi134417, la462, la1584, 'santa clara' and p25 (susceptible control). the oviposition of b. tabaci biotype b was evaluated by using ten couples of the insect in clip cages (2.8 cm2) attached to the abaxial surface of the leaflets. for evaluating the nymphal dispersion, it was considered the insect movement beyond the limits of the occupied area by the clip cages. the evaluated variables were adult mortality 24 hours after the liberation, egg numbers, egg viability, incubation period, nymph numbers and nymphal dispersal. under leaflets with glandular exudate, la716, la1739 and pi134417 caused the highest mortality values. dead adults found in leaflets of those genotypes were trapped to the glandular exudates, causing reduced oviposition by the insect. for nymphal dispersal, in leaflets with glandular exudate, the highest values occurred in la716, la462 and p25. in leaflets without glandular exudate, la716 promoted the lowest value for nymphal dispersal. the exudate influences negatively on the insect survivorship and oviposition. the nymphal dispersal is also affected by the glandular exudate, but other factors can make an important role on insect movement.
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