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Search Results: 1 - 10 of 77659 matches for " JOSé MONTEIRO;TEIXEIRA "
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Pineapple yield and fruit quality effected by NPK fertilization in a tropical soil
Spironello, Ademar;Quaggio, José Antonio;Teixeira, Luiz Antonio Junqueira;Furlani, Pedro Roberto;Sigrist, José Maria Monteiro;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000100041
Abstract: there is a lack of information about fertilization of pineapple grown in the state of s?o paulo, brazil. so a field experiment with pineapple 'smooth cayenne' was carried out to study the effects of npk rates on yield and fruit quality. the trial was located on an alfisol in the central part of the state of s?o paulo (agudos county). the experimental design was an incomplete npk factorial, with 32 treatments set up in two blocks. the p was applied only at planting, at the rates of 0; 80; 160 and 320 kg/ha of p2 05, as superphosphate. the n and k2o rates were 0; 175; 350, and 700 kg/ha, applied as urea and potassium chloride, respectively, divided in four applications during the growth period. response functions were adjusted to yield or to fruit characteristics in order to estimate the nutrient rates required to reach maximum values. the results showed quadratic effects of n and k on yield and a maximum of 72 t/ha of fresh fruit was attained with rates of 498 and 394 kg/ha, respectively of n and k2o. in order to reach the maximum fruit size, and to improve the percentage of first class fruit (mass greater than 2.6 kg), were necessary rates of n and k respectively 11 and 43 % higher than those for maximum yield. no effect of p rates was observed on pineapple plant growth, despite the low availability of this nutrient in the soil. the effect of n rates was negative on total soluble solids and total acidity while the opposite occurred with k, which increased also the content of vitamin c. high yield and fruit size were closely related to n and k concentrations in the leaves.
Perennial herbaceous legumes as live soil mulches and their effects on C, N and P of the microbial biomass
Duda, Gustavo Pereira;Guerra, José Guilherme Marinho;Monteiro, Marcela Teixeira;De-Polli, Helvécio;Teixeira, Marcelo Grandi;
Scientia Agricola , 2003, DOI: 10.1590/S0103-90162003000100021
Abstract: the use of living mulch with legumes is increasing but the impact of this management technique on the soil microbial pool is not well known. in this work, the effect of different live mulches was evaluated in relation to the c, n and p pools of the microbial biomass, in a typic alfisol of seropédica, rj, brazil. the field experiment was divided in two parts: the first, consisted of treatments set in a 2 x 2 x 4 factorial combination of the following factors: live mulch species (arachis pintoi and macroptilium atropurpureum), vegetation management after cutting (leaving residue as a mulch or residue remotion from the plots) and four soil depths. the second part had treatments set in a 4 x 2 x 2 factorial combination of the following factors: absence of live mulch, a. pintoi, pueraria phaseoloides, and m. atropurpureum, p levels (0 and 88 kg ha-1) and vegetation management after cutting. variation of microbial c was not observed in relation to soil depth. however, the amount of microbial p and n, water soluble c, available c, and mineralizable c decreased with soil depth. among the tested legumes, arachis pintoi promoted an increase of microbial c and available c content of the soil, when compared to the other legume species (pueraria phaseoloides and macroptilium atropurpureum). keeping the shoot as a mulch promoted an increase on soil content of microbial c and n, total organic c and n, and organic c fractions, indicating the importance of this practice to improve soil fertility.
Fontes de fósforo aplicadas na cultura do mel?o via água de irriga??o
Brito, Luiza Teixeira de Lima;Soares, José Monteiro;Faria, Clementino Marcos Batista de;Costa, Nivaldo Duarte;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2000, DOI: 10.1590/S1415-43662000000100004
Abstract: this study was carried out with the objective of evaluating the effect of three phosphorus sources applied conventionally and through trickle irrigation on melon crop (cucumis melo l.), hybrid af-682. the sources of phosphorus were simple superphosphate, monoammonium phosphate (map) and phosphoric acid applied up to 30 and 42 days after germination through trickle irrigation and conventionally. the experiment was conducted in a completely randomized block design, with four replications. all the treatments had the same amount of phosphorus (120 kg ha-1 of p2o5) according to soil analysis. the highest commercial fruit yields were obtained with phosphoric acid applied through trickle irrigation up to 30 and 42 days after germination (28.90 and 32.20 t ha-1, respectively), not differing from map applied through trickle irrigation up to 42 days after germination (27.95 t ha-1). the sources of phosphorus and modes of application did not influence the mean weight of fruits (1.43 kg), 65% of fruits being of type 8 to 10; however differences were observed in the soluble solids content at harvest time, highest content (brix 12.53o) was obtained in phosphoric acid treatment.
Parcelamento da aduba??o NPK em abacaxizeiro
TEIXEIRA, LUIZ ANTONIO JUNQUEIRA;SPIRONELLO, ADEMAR;FURLANI, PEDRO ROBERTO;SIGRIST, JOSé MARIA MONTEIRO;
Revista Brasileira de Fruticultura , 2002, DOI: 10.1590/S0100-29452002000100047
Abstract: a field experiment was carried out on an alfisol in s?o paulo state, brazil, with the objective of investigating the effects of split application of npk fertilizer on pineapple ('smooth cayenne') yield and fruit quality. six patterns of split application of fertilizers were tested as follows: t1 (control) ? n and k rates split in four applications (60 kg ha1 of n and k2o in jun/95; 120 kg ha1 of n and k2o in nov/95; 250 kg ha1 of n and k2o in jan/96 and 120 kg ha1 of n and k2o in mar/96); t2 ? n and k rates split in four applications (60 kg ha1 of n and k2o in jun/95; 120 kg ha1 of n and k2o in nov/95; 160 kg ha1 of n and k2o in jan/96 and 210 kg ha1 of n and k2o in mar/96); t3 ? n and k rates split in three applications (90 kg ha1 of n and k2o in jun/95; 180 kg ha1 of n and k2o in nov/95 and 280 kg ha1 of n and k2o in jan/96); t4 - n and k split in five applications (60 kg ha1 of n and k2o in jun/95; 110 kg ha1 of n and k2o in nov/95; 160 kg ha1 of n and k2o in jan/96; 110 kg ha1 of n and k2o in mar/96 and 110 kg ha1 of n and k2o in may/96); t5 - differed from t1 due to five applications of n; all p fertilizer was applied at planting (mai/95) in these treatments (t1 to t5); t6 - differed from t1 due to split application of p (50% at planting and 50% in jan/96). fruit weight and quality were influenced by split application of n and k. differently, split application of p has no effect on fruit production. the split of n rate in five applications produced heavier fruits, but the effect of late application of n on fruit quality was negative due to a decrease of soluble solids content.
Análise de processos alternativos na prepara o de esqueletos para uso didático = Analysis of alternative processes of skeleton preparation for educational uses
Márcio José da Silveira,Gustavo Monteiro Teixeira,Edson Fontes de Oliveira
Acta Scientiarum : Biological Sciences , 2008,
Abstract: Laboratórios de Zoologia em Institui es de Pesquisa e Ensino têmdemonstrado grande demanda por pe as anat micas para utiliza o em aulas práticas. No entanto, embora a bibliografia voltada para este tema n o seja escassa, s o raras as análises das rela es custo/benefício de tais processos levando em considera o aspectos técnicos, como tempo de preparo, qualidade das pe as e recursos materiais e humanos. Além de técnicas usualmente utilizadas, novos produtos de baixo custo, n o-citados na literatura e encontrados facilmente no mercado, também foram testados. O principal objetivo deste trabalho foi a elabora o e organiza o de informa es sobre técnicas alternativas de macera o de pe as ósseas para cole es didáticas, realizando análises comparativas sobre as rela es custo/benefício de cada técnica. Foram testados 12 produtos, dos quais foram avaliados os resultados a diferentes condi es experimentais, tais como: concentra o e combina o dos reagentes, temperatura, pH e tempo de exposi o das pe as aos reagentes.Os resultados indicaram que os produtos mais recomendados para a utiliza o nos processos de macera o foram: a água, o peróxido de hidrogênio e o suco de mam o (Carica papaya). Zoology laboratories at institutions of research and education haveshown great demand for anatomical parts for practical lessons. However, although the bibliography is not necessarily scarce, analyses of the cost/benefit relations of such processesare rare, considering aspects such as preparation time, quality of the anatomical parts, and material and human resources. In addition to the common techniques already used, new low-cost products, not cited in literature and easily found in the market, were also tested.The main objective of this work was to elaborate and organize information on techniques of bone parts maceration for study collections, making comparative analyses on the cost/benefit relations of each technique. Twelve products were tested, evaluatingexperimental conditions such as: concentration and combination of reagents, temperature, pH and time of exposure of the parts to the reagents. The results indicated that the products recommended for the use in the maceration processes were: water, hydrogen peroxide andpapaya juice (Carica papaya).
Consumo Hídrico e Energético da Irriga o de Café no Triangulo Mineiro e Oeste da Bahia
Marconi Batista Teixeira,Rodrigo Otávio Camara Monteiro,José Alves Júnior,Luiz Fabiano Palaretti
Revista Brasileira de Agricultura Irrigada , 2011, DOI: 10.7127/rbai.v5n200046
Abstract: Este estudo foi realizado com o objetivo de avaliar as necessidades de água e o consumo de energia (elétrica e diesel) para os quatro primeiros anos de desenvolvimento do caféutilizando plantio tradicional, irrigado por três sistemas de irriga o (SI) com rela es de potência para o conjunto motobomba de SI1: 2,0; SI2: 1,5 e SI3: 1,2 cv ha-1. Foram realizadas simula es, utilizando o programa IRRIGER , para as regi es do Triangulo Mineiro e Oeste da Bahia. A regi o Oeste da Bahia apresentou maiores necessidades hídrica para o cafeeiro em todos os anos avaliados. O SI1 foi o que apresentou os menores valores de consumo de energia e água, seguido do SI2. Já o SI3 apresentou valores elevados em rela o aos demais sistemas, para ambas as regi es em todo o período avaliado. O sistema SI2 foi o sistema que mais se aproximou do SI1, quanto ao consumo de água em todas as fases estudadas, diferenciando-se apenas quanto ao consumo de energia, que foi mais elevado em todo o período avaliado.
Parcelamento da aduba o NPK em abacaxizeiro
TEIXEIRA LUIZ ANTONIO JUNQUEIRA,SPIRONELLO ADEMAR,FURLANI PEDRO ROBERTO,SIGRIST JOSé MARIA MONTEIRO
Revista Brasileira de Fruticultura , 2002,
Abstract: Um experimento foi desenvolvido em Agudos (SP), num Argissolo Vermelho-Amarelo, com o objetivo de avaliar o efeito do parcelamento da aduba o NPK em abacaxizeiro 'Smooth Cayenne'. Foram estudados os seguintes esquemas de fracionamento da aduba o NPK: T1 (testemunha) -- N e K parcelados em quatro aplica es (60 kg ha1 de N e de K2O em jun/95; 120, em nov/95; 250, em jan/96 e 120, em mar/96); T2 -- N e K parcelados em quatro aplica es (60 kg ha1 de N e de K2O em jun/95; 120, em nov/95; 160, em jan/96 e 210, em mar/96); T3 -- N e K parcelados em três aplica es (90 kg ha1 de N e de K2O em jun/95; 180, em nov/95 e 280, em jan/96); T4 -- N e K parcelados em cinco aplica es (60 kg ha1 de N e de K2O em jun/95; 110, em nov/95; 160, em jan/96; 110, em mar/96 e 110, em maio/96); T5 -- diferiu do T1 pelo número maior de aplica es de K (cinco) e, do T4 pelo menor número de aplica es de N (quatro); nesses cinco tratamentos (T1 a T5), todo o P foi aplicado no plantio (maio/95); T6 -- N e K parcelados como no T1 e P em duas aplica es (50% no plantio e 50% em jan/96). Os frutos, colhidos 21 meses após o plantio, tiveram sua massa média e qualidade influenciadas pela forma de parcelamento da aduba o com N e K; de outro modo, o fracionamento da aduba o fosfatada n o influenciou a produ o. O parcelamento com aplica o mais tardia de N (cinco aplica es, até 12 meses após o plantio-T4) aumentou a produ o, contudo, teve efeito negativo sobre o teor de sólidos solúveis dos frutos.
Perennial herbaceous legumes as live soil mulches and their effects on C, N and P of the microbial biomass
Duda Gustavo Pereira,Guerra José Guilherme Marinho,Monteiro Marcela Teixeira,De-Polli Helvécio
Scientia Agricola , 2003,
Abstract: The use of living mulch with legumes is increasing but the impact of this management technique on the soil microbial pool is not well known. In this work, the effect of different live mulches was evaluated in relation to the C, N and P pools of the microbial biomass, in a Typic Alfisol of Seropédica, RJ, Brazil. The field experiment was divided in two parts: the first, consisted of treatments set in a 2 x 2 x 4 factorial combination of the following factors: live mulch species (Arachis pintoi and Macroptilium atropurpureum), vegetation management after cutting (leaving residue as a mulch or residue remotion from the plots) and four soil depths. The second part had treatments set in a 4 x 2 x 2 factorial combination of the following factors: absence of live mulch, A. pintoi, Pueraria phaseoloides, and M. atropurpureum, P levels (0 and 88 kg ha-1) and vegetation management after cutting. Variation of microbial C was not observed in relation to soil depth. However, the amount of microbial P and N, water soluble C, available C, and mineralizable C decreased with soil depth. Among the tested legumes, Arachis pintoi promoted an increase of microbial C and available C content of the soil, when compared to the other legume species (Pueraria phaseoloides and Macroptilium atropurpureum). Keeping the shoot as a mulch promoted an increase on soil content of microbial C and N, total organic C and N, and organic C fractions, indicating the importance of this practice to improve soil fertility.
Biomassa microbiana em amostras umedecidas após secagem ao ar de solos de toposeqüência de pastagens Microbial biomass in air dried and moisturized soil samples from toposequences of pasture
Antonio Samar?o Gon?alves,Marcela Teixeira Monteiro,José Guilherme Marinho Guerra,Alejandro Oscar Costantini
Ciencia del Suelo , 2007,
Abstract: Neste experimento avaliou-se o carbono da biomassa microbiana do solo (C-BMS) em diferentes solos sob topossequência de pastagem e a viabilidade de utilizar amostras condicionadas na forma de terra fina seca ao ar (TFSA). Observou-se para C-BMS, separa o dos conteúdos entre os diferentes tipos de solo. A época de inverno favoreceu a C-BMS, elevando-se em 60% em rela o ao ver o. Na compara o realizada entre os solos preparados na forma de TFSA e com a metodologia de fumiga o-extra o n o se detectou diferen a significativa, encontrando-se correla es significativas para os dois métodos de preparo das amostras, o que estabelece um panorama promissor no uso desta metodologia, embora seja necessário maior aprofundamento neste aspecto. In this experiment we evaluated microbial biomass carbon (C-SMB) from different soils under toposequences of pasture and the viability of the use of air dried soil samples (ADSS). C-SMB showed separation of values between different soil types. Winter season favored C-SMB being 60% higher in relation to summer. In comparison between the two soil sample preparation methods, ADSS and the classical one, there was no statistical. Significant correlations were observed between the two methods. This gives a positive perspective to the use of this new approach, even thought more study is necessary.
Níveis de nitrogênio por fertirriga??o e densidade de plantio na cultura do mel?o em um Vertissolo
FARIA, CLEMENTINO MARCOS BATISTA DE;COSTA, NIVALDO DUARTE;PINTO, JOSé MARIA;BRITO, LUIZA TEIXEIRA DE LIMA;SOARES, JOSé MONTEIRO;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000300003
Abstract: this study consisted of one experiment with melon (cucumis melo l.), carried out in a vertisol in juazeiro, ba, brazil, in 1995, with the objective of evaluating the effects of nitrogen levels through fertirrigation and plant density on fruit yield and quality. the n levels were 0, 80, 130 and 180 kg/ha, combined with row spacings of 2.0 and 1.8 m and 0.20 m between plants within the row, with one or two plants/hole. the source of n was urea applied daily up to 42 days after germination, through drip irrigation. all treatments had a uniform fertilization of 120 kg/ha of p2o5 and 120 kg/ha of k2o. no significant difference was caused by spacing between rows in the studied variables. eighty kg/ha of n combined with one plant per hole gave a yield of 34.07 ton/ha, being 55,7% of fruit allocated to inside market, not significantly lower than those obtained with the highest n levels in any combination. this same n level gave fruits with 10.22o brix, significantly higher than the treatment without n and not significantly lower than the other levels. in order to get high number of good fruit for out side market it was necessary to elevate the density to two plants per hole and n level to 130 or 180 kg/ha. mean weight of fruits increased from 1.008 to 1.705 kg with the increase in the levels of n and the decrease in plant density of two plants per hole to one plant per hole.
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