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| Registros recuperados: 413 | |
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| Carvalho,Saul Jorge Pinto de; Nicolai,Marcelo; Ferreira,Renato Rodrigues; Figueira,Antonio Vargas de Oliveira; Christoffoleti,Pedro Jacob. |
| Herbicide selectivity is an agricultural technology largely exploited in chemical strategies of weed control. The joint action of several protection mechanisms avoids phytotoxicity from herbicide treatment, maintaining the level of agronomically accepted damage to a minimum, or even totally avoiding them. The major mechanism of herbicide selectivity derives from the differential metabolism between weed and crop plant species, with weeds presenting a limited ability to perform it under agronomically recommended conditions. In this case, phytotoxicity can be interpreted as an overcoming of the maximum protection capacity offered by the mechanisms of selectivity, or when considering metabolism as the main factor, the overcoming of the inherent plant ability... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytotoxicity; Injuries; Yield; Experimental design; Crop management. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000100020 |
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| Beutler,Amauri Nelson; Centurion,José Frederico. |
| Soil compaction and fertilization affect soybean development. This study evaluated the effects of soil compaction and fertilization on soybean (Glycine max cv. Embrapa 48) productivity in a Typic Haplustox under field conditions in Jaboticabal, SP, Brazil. A completely randomized design with a 5 x 2 factorial layout (compaction vs. fertilization), with four replications in each treatment, was employed. Each experimental unit (replicate) consisted of a 3.6 m² useful area. After the soil was prepared by cultivation, an 11 Mg tractor passed over it a variable number of times to create five levels of compaction. Treatments were: T0= no compaction, T1= one tractor pass, T2= two, T4= four, and T6= six passes, and no fertilizer and fertilizer to give soybean... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bulk density; Penetration resistance; Fertilizer; Yield. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600010 |
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| Landell,Marcos Guimarães de Andrade; Prado,Hélio do; Vasconcelos,Antônio Carlos Machado de; Perecin,Dilermando; Rossetto,Raffaella; Bidoia,Márcio Aurélio Pitta; Silva,Marcelo de Almeida; Xavier,Mauro Alexandre. |
| In spite of the great homogeneity found in the morphological characteristics of Oxisols, there is great chemical diversity in subsurface layers of these soils. Studies indicate that crop yield presents significant correlation with the chemical attributes of the subsurface, which, are more stable than attributes found in the plough layer, subject to greater alterations as a consequence of agricultural exploration. This work evaluated the effects of subsurface chemical attributes of Oxisols of the South Central region of Brazil, on the yield of sugarcane clones and of variety RB72454, during the first, second and third cropping cycles. Productivity data were obtained between 1993 and 1998. Soils were characterized in terms of their mechanical analysis and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Yield; Soils; Linear models; Chemical analysis. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000400020 |
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| Nogueira,S.S.S.; Nagai,V.; Braga,N.R.; Novo,M. Do C.S.S.; Camargo,M.B.P.. |
| An experiment to study the growing pattern of a chickpea variety, IAC-Marrocos, was carried out at the Monte Alegre Experimental Station, SP, during 1987 and 1988. The dry matter production of all parts of the plant, as well the leaf area index, were weekly evaluated. Exponential quadratic models of regression were adjusted to total dry matter, leaf dry matter and leaf area index, and a linear model to dry matter of grain. Based on the growth analysis it was concluded that the chickpea is a rustic eatable plant that can be recommended as an alternative winter crop for similar climatic conditions as those of the experiment. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chickpea; Growing indexes; Yield. |
| Ano: 1994 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90161994000300008 |
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| Ávila,Marizangela Rizzatti; Braccini,Alessandro de Lucca e; Scapim,Carlos Alberto; Albrecht,Leandro Paiola; Tonin,Telmo Antônio; Stülp,Marcibela. |
| The application of vegetal bioregulators has shown promising results, mainly in cultures that have already reached a high level of technology. Based on this context an experiment was carried out with the objective of evaluating agronomic traits of plants, such as yield and quality of seeds, produced by applying bioregulators to a soybean crop. For this purpose, the following treatments were carried out: before sowing - seed treatment (25, 50 and 75 mL for 100 kg-1 seeds); during sowing time - spraying on the sowing lines (pulverization onto the sowing lines) (50, 100 and 150 mL ha-1); between stages V5 and V6 (25, 50 and 75 mL ha-1); and the control - no treatment. Emergence speed, final seedling emergence, number of pods and seeds per plant, average... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth regulator; Yield; Vigor; Germination. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162008000600006 |
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| Legua,Pilar; Pinochet,Jorge; Moreno,María Ángeles; Martínez,Juan José; Hernández,Francisca. |
| Peach (Prunus persica L.) is the most important stone fruit tree grown in Spain and is the second most important fruit crop in Europe. The influence of eight Prunus rootstocks (GF-677, Krymsk® 86, PADAC 97-36, PADAC 99-05, PADAC 9912-03, PADAC 0024-01, PAC 0021-01 and PAC 0022-01) on vigor, yield and fruit quality traits of 'UFO 3' flat peach cultivar was studied. The highest trunk cross sectional area was exhibited by GF-677 and the lowest by PADAC 99-05, while intermediate values were found on the other rootstocks. The highest yield efficiency was found on PADAC 99-05, PAC 0021-01, PAC 0022-01 and PADAC 0024-01 and the lowest was shown on Krymsk® 86. The fruit quality parameters measured were color, fruit and stone weights, equatorial diameter, pulp... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: SSC; Fruit weight; Rootstock; Acidity; Yield. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100003 |
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| Teixeira,Itamar Rosa; Borém,Aluízio; Araújo,Geraldo Antônio de Andrade; Fontes,Renildes Lúcio Ferreira. |
| The occurrence of micronutrient deficiencies, mainly of manganese (Mn) and zinc (Zn) in "cerrado" soils, has been increasing in several crops, including bean. Such a problem is caused by high rates of liming material applied entirely on the soil surface. In this study, the effects of the leaf application of Mn and Zn rates were evaluated. Three experiments were carried out: two in greenhouse and one under field conditions. The greenhouse experiments were set up using a randomized block design and a 5 x 5 factorial, with three replicates, consisting of five rates of Mn (0, 75, 150, 300, and 600 g ha-1) and five rates of Zn (0, 50, 100, 200, and 400 g ha-1) applied via leaves at the 25th day, or both alternatively parceled at 25 and 35 days after emergency... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phaseolus vulgaris; Yield; Mineral nutrition; Micronutrients. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000100013 |
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| Stuchi,Eduardo Sanches; Silva,Simone Rodrigues da; Donadio,Luiz Carlos; Sempionato,Otávio Ricardo; Reiff,Eduardo Toller. |
| Some viroids reduce citrus tree growth and may be used for tree size control aiming the establishment of orchards with close tree spacing that may provide higher productivity than conventional ones. To study the effects of citrus viroids inoculation on vegetative growth, yield and fruit quality of 'Marsh Seedless' grapefruit (Citrus paradisi Macf.) grafted on trifoliate orange [Poncirus trifoliata (L.) Raf.], an experiment was set up in January 1991, in Bebedouro, São Paulo State, Brazil. The experimental design was randomized blocks with four treatments with two plants per plot: viroid isolates Citrus Exocortis Viroid (CEVd) + Hop stunt viroid (HSVd - CVd-II, a non cachexia variant) + Citrus III viroid (CVd-III) and Hop stunt viroid (HSVd - CVd-II, a non... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Growth; Yield; Fruit quality; Exocortis; Dwarfing. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000600004 |
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| Gonçalves,Paulo de Souza; Silva,Marcelo de Almeida; Aguiar,Adriano Tosoni da Eira; Martins,Maria Alice; Scaloppi Junior,Erivaldo José; Gouvêa,Lígia Regina Lima. |
| The Hevea breeding program of Instituto Agronômico de Campinas (IAC) has completed clonal evaluation on the following series: IAC 100, IAC 200 and IAC 300. The performance of 22 clones of Hevea brasiliensis (Willd. ex Adr. de Juss.) Muell.-Arg., evolved at IAC, over a period of eleven years was evaluated in the Western Central part of the São Paulo State, Brazil. Among these 22 new clones, six were intraspecific hybrid clones (IAC 400, IAC 404, IAC 405, IAC 406, IAC 410, IAC 412) and the remaining are primary those resulted from selected ortets within half-sib progenies. An old popular clone RRIM 600, of Malaysian origin, was used as the control. The trial was laid out in a randomized block design with three replications. Yield performance over a period of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hevea brasiliensis; Yield; Vigour; Brown bast; Bark thickness. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300005 |
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| Liang,Yinli; Bai,Caihong; Mu,Lan; Zhou,Maojuan. |
| Crop residues are the primary source of carbon input in the soil carbon pool. Crop rotation can impact the plant biomass returned to the soil, and influence soil respiration. To study the effect of previous crops on soil respiration in cucumber (Cucumis statirus L.) fields in solar greenhouses, soil respiration, plant height, leaf area and yield were measured during the growing season (from the end of Sept to the beginning of Jun the following year) from 2007 to 2010. The cucumber was grown following fallow (CK), kidney bean (KB), cowpea (CP), maize for green manure (MGM), black bean for green manure (BGM), tomato (TM), bok choy (BC). As compared with CK, KB, CP, MGM and BGM may increase soil respiration, while TM and BC may decrease soil respiration at... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Leaf area; CO2 emission; Plant height; Previous crop; Yield. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162014000400012 |
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| Jaramillo-Botero,Catalina; Santos,Ricardo Henrique Silva; Martinez,Herminia Emilia Prieto; Cecon,Paulo Roberto; Fardin,Merci Pereira. |
| It is difficult to separate the effects of light reduction versus nutrient and water competition in agroforestry systems. The objective of this experiment was to evaluate the effect of shading and fertilizer supply on the vegetative development and yield of Coffea arabica over six years. The coffee trees were covered with shade screens (photosynthetically active radiation reduction up to 48%) and fertilized from 100 to 40% of the recommended amount from 2001 on. Leaf area, number of leaves, number of nodes, leaf area per branch and, yield were determined. Although no effect of fertilization was found, shading influenced the number of nodes, leaf area and production from the third year on. The number of nodes and yield decreased as shading increased. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Coffea arabica; Bienniallity; Plant growth and development; Yield. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000600004 |
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| Dias,Frederico Alcântara Novelli; Mota,Renata Vieira da; Souza,Claudia Rita de; Pimentel,Rodrigo Meirelles de Azevedo; Souza,Laís Cristina de; Souza,André Luiz de; Regina,Murillo de Albuquerque. |
| ABSTRACT In the Brazilian Southeast, the production of high quality wines is attained by a new management approach called double pruning. This management changes the harvesting of wine grape (Vitis vinifera L.) from wet summer to dry winter through a two pruning procedures carried out during the year. The first pruning is done during the winter to induce a vegetative cycle (all clusters are removed) and a second pruning is done during the summer to induce the reproductive cycle. In this study, ten different rootstocks were compared in order to optimize yield and wine quality of Syrah vines conducted under autumn-winter season by double pruning approach. Syrah grapevines grafted onto ‘Rupestris du Lot’ and ‘IAC 766’ showed the highest pruning weight, while... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera; Autumn-winter season; Vigor; Yield; Berry quality. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000200134 |
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| Daros,Máskio; Amaral Jr.,Antônio Teixeira do; Pereira,Messias Gonzaga; Santos,Fabrício Santana; Gabriel,Ana Paula Cândido; Scapim,Carlos Alberto; Freitas Jr.,Silvério de Paiva; Silvério,Lucas. |
| Although much appreciated in Brazil, commercial popcorn is currently cropped on a fairly small scale. A number of problems need to be solved to increase production, notably the obtaintion of seeds with good agronomic traits and good culinary characteristics. With the objective of developing superior genotypes in popcorn, a second cycle of intrapopulation recurrent selection based on inbred S1 families was carried out. From the first cycle of selection over the UNB-2U population, 222 S1 families were obtained, which were then divided into six sets and evaluated in a randomized complete block design with two replications within the sets. Experiments were carried out in two Brazilian localities. The analysis of variance revealed environmental effects for all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Breeding program; S1 families; Yield; Popping expansion. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000600008 |
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| Leão,Patrícia Coelho de Souza; Chaves,Agnaldo Rodrigues de Melo. |
| ABSTRACT The aim of this research was to study the influence of training system and rootstock on the yield, vigor and physiology of the ‘Chenin Blanc’ grapevine at São Francisco Valley, northeastern Brazil. An experiment was carried out on eight harvests, from 2013 to 2017, in Petrolina, in the state of Pernambuco. Grapevines were grown under two training systems, lyre and espalier, and five rootstocks: ‘IAC 572’, ‘IAC 313’, ‘IAC 766’, ‘Paulsen 1103’ and ‘SO4’, using a split-plot randomized block design, with training systems assigned to the main plot and the rootstock assigned to the subplot. Lyre favored an increase in the number of bunches, branches and leaf mass in the harvest of the first semester of the year, while in the second semester there were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Vitis vinifera; Tropical viticulture; Yield; Vigor. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162021000100601 |
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| Registros recuperados: 413 | |
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