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| Registros recuperados: 18 | |
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| Silva,Paulo Sérgio Lima e; Silva,Kathia Maria Barbosa e; Lôbo,Raimundo Nonato Braga; Silva,Paulo Igor Barbosa e. |
| Measuring plant height (y) and canopy diameter (x) in trees may not be an easy task, but stem diameter (z) can be more easily evaluated. This work's objective was two-fold: evaluate the growth of species adapted to the Brazilian Semi-Arid Region in the first two years of age, and obtain linear equations to estimate y and x from z, in those species. A random block design with four replications was employed. The values for x, z, and y were measured biannually from October/2003 to March/2005. Prosopis juliflora and Mimosa caesalpiniaefolia showed the highest stem diameter and plant height values, respectively, and both showed the highest canopy diameter. In the equations to estimate plant height from the stem diameter the value of the coefficient of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Caatinga; Canopy diameter; Plant height; Regression analysis; Stem diameter. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000400018 |
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| Silva,Paulo Igor Barbosa e; Negreiros,Maria Zuleide de; Moura,Karidja Kalliany Carlos de Freitas; Freitas,Francisco Cláudio Lopes de; Nunes,Glauber Henrique de Sousa; Silva,Paulo Sérgio Lima e; Grangeiro,Leilson Costa. |
| O objetivo deste trabalho foi avaliar o crescimento do pimentão cv. Atlantis sob diferentes arranjos espaciais. Foram avaliados três arranjos de espaçamentos entre fileiras duplas e fileiras simples de plantio (1,5x0,5, 1,6x0,4 e 1,7x0,3 m), e quatro espaçamentos entre plantas nas fileiras (0,2, 0,3, 0,4 e 0,5 m), combinados em esquema fatorial. Utilizou-se o delineamento de blocos ao acaso, com três repetições e parcelas subdivididas no tempo. A avaliação de crescimento foi realizada em nove épocas espaçadas em 14 dias, com a primeira avaliação realizada 14 dias após o transplantio (DAT). Até os 126 DAT, foram avaliados: área foliar (AF); índice de área foliar (IAF); massas secas de folhas (MSF), do caule (MSC), de frutos (MSFr) e do total da parte aérea... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Capsicum annuum; Acúmulo de massa seca; Análise de crescimento; Densidade de plantio. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010000200003 |
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| Silva,Paulo Sérgio Lima e; Silva,Paulo Igor Barbosa e. |
| Um estudo foi realizado em dois anos, com irrigação por aspersão, para avaliar os efeitos da época de aplicação de 120 kg/ha de N (sulfato de amônio) no rendimento de grãos do milho. Utilizou-se o delineamento de blocos ao acaso, com cinco repetições e os seguintes tratamentos: aplicação de todo o N por ocasião do plantio (1-0-0), em cobertura, aos 25 (0-1-0) e aos 45 (0-0-1) dias após o plantio, e aplicação do N de forma parcelada (0-1/3-2/3, 1/3-0-2/3, 1/3-2/3-0, 0-1/2-1/2, 1/2-0-1/2, 1/2-1-/2-0, 0-2/3-1/3, 2/3-0-1/3, 2/3-1/3-0 e 1/3-1/3-1/3). O efeito de tratamentos foi independente do efeito de anos. O maior rendimento de grãos (4.960 kg/ha) foi obtido com o tratamento 0-1/3-2/3, mas todos os demais tratamentos propiciaram rendimentos comparáveis,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Adubos. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002000800002 |
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| Silva,Paulo Sérgio Lima e; Antonio,Rafaela Priscila; Mariguele,Keny Henrique; Silva,Kathia Maria Barbosa e; Lima,Lidiane Kely de; Silva,Júlio César do Vale. |
| Apparently, there are no custard apple cultivars defined for the northeastern region of Brazil. The establishment of breeding programs aimed at the selection of types from productive locations for later cloning is desirable. This work's objective was to evaluate the yield (during the first three crops) and quality (first crop) of fruits from 20 half-sibling custard apple tree progenies, selected from home orchards. An additional objective was to estimate genetic parameters for the traits evaluated. A micro sprinkling-irrigated experiment was conducted in Mossoró-RN, Brazil, as random blocks with five replications. In characteristics evaluated for periods longer than a year (diameter, height and mean weight of fruits, number of fruits ha-1 and fruit yield... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annona squamosa L.; Bullock's heart; Sweetsop; Heritability; Genotypic correlation. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452007000300027 |
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| Silva,Paulo Sérgio Lima e; Barbin,Decio; Gonçalves,Ranoel José de Sousa; Firmino,João Domingos da Cruz; Fonseca,Idaiane Costa. |
| Leaf area measurements are required in several agronomical studies. Usually, there is an interest for measurement methods that are simple, quick and that will not destroy the leaf. The objectives of this work were to evaluate leaf area (y), length (l) and width (w) of 20 half-sibling progenies of custard apple tree (Annona squamosa L.), and to fit regression equations of the type y = a + bx, where x = l.w, that will allow y to be estimated based on l and w. The experiment was conducted as random blocks with five replicates and four plants per plot. Five mature leaves were randomly collected from each plant. Leaf area was measured with an automatic measuring device and leaf dimensions were determined with a ruler. All values of b were different from zero.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Annona squamosa; Sugar apple. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000300046 |
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| Silva,Paulo Sérgio Lima e; Fonseca,Jailton Roberto da; Mota,Jaedson Cláudio Anuncia; Silva,Jaeveson da. |
| O objetivo do trabalho foi avaliar os efeitos da densidade de plantio (7; 10; 13; 16; 19; 22 e 25 mil plantas/ha) sobre o rendimento de frutos do meloeiro, cv. Gold Pride. As densidades foram obtidas mantendo-se constante (2,0 m) o espaçamento entre fileiras e variando-se o espaçamento entre covas. O trabalho foi realizado em Tibau-RN, com irrigação por gotejamento. Utilizou-se o delineamento de blocos ao acaso, com sete repetições. O aumento da densidade de plantio aumentou o número e a massa de frutos, totais, comercializáveis e não-comercializáveis, reduziu o comprimento e o diâmetro dos frutos comercializáveis, mas não influenciou o teor de sólidos solúveis dos frutos comercializáveis. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Melão; População de plantas; Espaçamento. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452003000200015 |
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| Silva,Kathia Maria Barbosa e; Almeida,Francisco Aécio Guedes; Silva,Paulo Sérgio Lima e. |
| The objective of this work was to evaluate peduncle and fruit yield in clone MS 076 and in a clonal population of drip-irrigated, early dwarf cashew trees propagated by layering, in six cropping seasons. In order to meet the increased water requirements of the crop resulting from plant growth and development, irrigation during the dry season was performed daily according to the following water regime: 15 min/plant/day during the 1st year, 30 min/plant/day during the 2nd year, 45 min/plant/day during the 3rd year and 60 min/plant/day during all subsequent years. Water was supplied by one drip emitter/plant, at an (adjustable) flow rate of 36 L/h.The research was carried out in Fortaleza-Ceará, Brazil, and a random block design was utilized, with five... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Anacardium occidentale; Cashew nut; Cashew apple. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452004000300024 |
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| Silva,Paulo Sérgio Lima e; Mariguele,Keny Henrique; Silva,Paulo Igor Barbosa e. |
| A região dos municípios Mossoró-Açu apresenta grande importância na produção de melão amarelo no estado do Rio Grande do Norte, com cultivos realizados de junho a novembro. Nesse período existem variações nos fatores climáticos, sugerindo a possibilidade de influência da época de semeadura sobre o comportamento do meloeiro. O objetivo do trabalho foi avaliar os efeitos de épocas de semeadura (19/8, 9/9 e 29/9 de 1999) e de cultivares (Rochedo, AF 646, Gold Pride, Gold Mine e Goldex) sobre a produtividade da cultura do meloeiro. Utilizou-se o delineamento de blocos ao acaso com três repetições e parcelas subdivididas. As épocas foram aplicadas às parcelas e as cultivares, às subparcelas. Não houve efeito da interação épocas de semeadura x cultivares nas... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cucumis melo L.; Melão amarelo; Cultivares. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452003000300050 |
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| Sousa,Roberto Pequeno de; Silva,Paulo Sérgio Lima e; Assis,Janilson Pinheiro de. |
| RESUMO Na experimentação agrícola, a utilização do tamanho e da forma adequada de parcela são técnicas experimentais importantes para aumentar a precisão do experimento. Assim, objetivou-se nesse trabalho determinar o tamanho e forma adequada de parcela para experimentação em campo com girassol. Para isso, o experimento foi conduzido em blocos completos casualizados com 14 cultivares de girassol em 10 repetições. As parcelas foram constituídas de quatro fileiras de seis metros de comprimento, espaçadas de 0,7 m e 0,3 m entre plantas. A área útil da parcela (7,56 m2), composta das duas fileiras centrais, foi dividida em 12 unidades básicas, cada uma constituída por três plantas na fileira (0,63 m2), obtendo-se o rendimento de grãos de girassol. O tamanho... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L; Método de Hathewa; Método da informação relativa. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902016000400683 |
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| Silva,Paulo Sérgio Lima e; Santos,Luiz Eduardo Barreto dos; Oliveira,Vianney Reinado de; Sousa,Roberto Pequeno de; Fernandes,Patrícia Lianny de Oliveira. |
| In the sunflower, in addition to seed yield, it is of interest to evaluate number of leaves plant-1, head diameter, stem diameter and plant height, since these characteristics may be associated with seed yield or lodging. The objective of the work was to determine the optimal sample size (from which the experimental coefficient of variation, CV, can be established) for evaluation of these four characteristics. Fifteen cultivars were evaluated in an experimental design of randomized blocks with ten replications. The characteristics were evaluated using two sampling methods (in a single row of plants or in the two rows from the useable area of each plot) and sample sizes of from two to 18 sampling units, with an interval of two plants. In the two sampling... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L.; Plant height; Leaf number; Stem diameter; Head diameter. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100144 |
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| Silva,Tiago Santos; Silva,Paulo Sérgio Lima e; Braga,Jéfferson Dantas; Silveira,Lindomar Maria da; Sousa,Roberto Pequeno de. |
| In Mata Fresca, an area located on the border of the states of Rio Grande do Norte and Ceará, in Brazil, small farmers have a source of income from the production of cassava roots, using planting densities of around 5,000 plants ha-1. This procedure might be helping to limit higher yields of the roots, since some studies have shown that it is possible to obtain higher yields of cassava using higher densities. The objective of this study was to evaluate the root yield and other characteristics of the cassava, as a response to planting density. The Vermelhinha cultivar was submitted to planting densities of from 5,000 to 21,000 plants ha-1, at intervals of 2,000 plants ha-1, in an experiment under irrigation. A completely randomized block design with four... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manihot esculenta; Spacing; Plant populations. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000200014 |
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| Silva,Paulo Sérgio Lima e; Tomaz,Francisco Linco de Souza; Siqueira,Patrícia Liany de Oliveira Fernandes; Silva,Paulo Igor Barbosa e; Lima,Levi Afonso Cavalcante de. |
| ABSTRACT Bird attacks on the sunflower may hinder its exploitation in the Brazilian semi-arid region. The aim of this study was to evaluate the effects of different levels of protection (0, 33, 66 and 100%) of the capitula of eight sunflower cultivars, evaluated in randomized blocks with sub-divided plots and four replications. The cultivars were allocated in the plots and the levels of protection in the sub-plots, by covering the capitula with caps of non-woven fabric after physiological maturity. The most frequent bird species was the Paroaria dominicana. The Aguará 06 cultivar was the most productive and most tolerant to bird attack, followed by the Helio 250, CF 101 and Charrua cultivars. There was a positive correlation between yield loss (YL) due to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus; Paroaria dominicana; Protection of capitula; Phenotypic correlation; Genetic improvement. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902019000100114 |
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| Santos,Luiz Eduardo Barreto dos; Silva,Paulo Sérgio Lima e; Oliveira,Vianney Reinaldo de; Oliveira,Antonia Kennia de. |
| ABSTRACT Mulching using crop residue reduces the growth of weeds and increases the yield of various crops. The aim of the present study was to evaluate the effects of Gliricidia sepium branches, used as mulch, on weed control, and on grain yield in corn. A randomized block design was used, with split plots and five replications. The cultivars, 30F35H and AG 1051, were grown in the plots, and the following treatments applied in the subplots: no weeding, two weedings, and mulching with 10, 20 or 30 t ha-1 (fresh weight) gliricidia branches. The mulch material was applied between the sowing furrows after sowing the corn. Increasing the amount of gliricidia branches caused a linear reduction in weed growth, and increased growth and yield in the corn. Weed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Number of branches; Corn yield; Weed growth; Hoeings. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902020000100417 |
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| Silva,Paulo Sérgio Lima e; Oliveira,Vianney Reinaldo de; Silva,Paulo Igor Barbosa e; Chicas,Larissa da Silva; Tomaz,Francisco Linco de Souza. |
| ABSTRACTCultivating maize under systems of alley cropping results in improvements to the soil, a reduction in weeds and an increase in yield. Studies using ground cover from tree shoots produce similar results. The aim of this study was to evaluate the effects on weed growth and maize yield of ground cover made up of 30 t ha-1 (fresh matter) of branches from the tree species: neem (Azadirachta indica A. Juss), gliricidia [Gliricidia sepium(Jacq.) Kunth ex Walp.], leucaena [Leucaena leucocephala (Lam.) de Wit.] and sabiá (Mimosa caesalpiniifolia Benth.). Two treatment groups (cultivars and weed control) were evaluated. The cultivars AG 1041 and AL Bandeirantes were subjected to the following treatments: no hoeing, double hoeing, and ground a cover of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Azadirachta indica; Gliricidia sepium; Leucaena leucocephala; Mimosa caesalpiniifolia; Hoeing; Green corn. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000400809 |
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| Sousa,Roberto Pequeno de; Silva,Paulo Sérgio Lima e; Assis,Janilson Pinheiro de; Silva,Paulo Igor Barbosa e; Silva,Júlio César do Vale. |
| The aim of this study was to determine a suitable plot size for field experiments with the sunflower. An experiment was carried out in a randomised complete block design with 14 sunflower cultivars and 10 replications. The plots consisted of four rows, six metres in length, spaced 0.7 m apart with 0.3 m between plants. The working area of the plot (7.56 m2), consisting of the two central rows, was divided into 12 basic units, each consisting of three plants per row (0.63 m2), from where the yield of the sunflower seeds was obtained. Suitable plot size was estimated using the intraclass correlation coefficient method. The detectable difference between treatments was also estimated (d). The optimum plot size for the evaluation of grain yield in the sunflower... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Helianthus annuus L.; Intraclass correlation coefficient; Breeding. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902015000100170 |
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| Registros recuperados: 18 | |
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