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| Registros recuperados: 10 | |
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| Valença,David da Cunha; Carvalho,Daniel Fonseca de; Reinert,Fernanda; Azevedo,Ricardo Antunes; Pinho,Camila Ferreira de; Medici,Leonardo Oliveira. |
| ABSTRACT: Concerns with water crisis involve all sectors of society and irrigated agriculture remains the main water consumer. This study evaluated an agricultural production system for lettuce cultivation in greenhouse, “organic potponics”, to economize water and manure use, using a Simplified Irrigation Controller (SIC), based on soil matric potential monitoring. Five irrigation volumes were evaluated in pots with 4.8 L, fertilized with 200 g of vermicompost. One of the volumes was controlled with the SIC. The other volumes represented 130, 80, 60 and 33 % of that controlled by the SIC and all treatments received water at the same time. Shoot fresh weight, head diameter and stomatal conductance (gs) increased linearly with irrigation volumes. For shoot... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa; Water use efficiency; Production system; Water management; Automation. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162018000100052 |
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| Bezerra,Ana Carolina Mendes; Valença,David da Cunha; Carvalho,Daniel Fonseca de; Pinho,Camila Ferreira de; Reinert,Fernanda; Gomes,Daniela Pinto; Gabetto,Fernanda Palmeira; Azevedo,Ricardo Antunes; Masseroni,Daniele; Medici,Leonardo Oliveira. |
| ABSTRACT: Seedling production is an important step in the lettuce production system. However, there is a tendency to apply excessive irrigation at this stage. The aim of this study was to test the use of the Simplified Irrigation Controller (SIC) under two conditions: first, with the sensor installed in the substrate (measuring the soil water tension) and second, in the atmosphere (“atmospheric” - responding to vapor demand in the atmosphere) to control the irrigation of lettuce seedlings. The performance of the SIC was evaluated by monitoring plant traits. The lettuce seeds of the Regina cultivar were sown in styrofoam trays with commercial organic substrate. Both experiments were conducted under greenhouse conditions and evaluated under different SIC... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Lactuca sativa L.; Simplified Irrigation Controller; Water use efficiency. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162019001200179 |
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| Medici,Leonardo Oliveira; Gaziola,Salete Aparecida; Varisi,Vanderlei Aparecido; Paula,José Antonio Carmezini de; Ferreira,Renato Rodrigues; Azevedo,Ricardo Antunes. |
| Six S5 lines of maize, with differences for lysine and oil contents in grains, were used to carry out a complete series of diallelic crosses. The resulting 15 hybrids were grown in a field at two nitrogen levels (10 and 130 kg N ha-1). The general combining ability (GCA) and specific combining ability (SCA) were obtained by using the method 4, model I of Griffing for grain yield, and grain lysine and oil contents. Significant (p < 0.001) interaction was observed between GCA and N levels for grain yield, indicating the selection of different lines for each N level. This interaction was not significant for lysine content, but there were significant effects of GCA for this trait at both N levels (p < 0.1). Significant effects were not observed for GCA... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cereal; Opaque; Nitrogen; Proteins; Near infrared. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200009 |
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| Toro,Alejandro Alberto; Medici,Leonardo Oliveira; Sodek,Ladaslav; Lea,Peter John; Azevedo,Ricardo Antunes. |
| For human nutrition the main source of vegetable proteins are cereal and legume seeds. The content of total soluble amino acids in mature endosperm of wild-type, opaque and floury maize (Zea mays L.) mutants were determined by HPLC. The total absolute concentration of soluble amino acids among the mutants varied depending on the mutant. The o11 and o13 mutants exhibited the highest average content, whereas o10, fl3 and fl1 exhibited the lowest average content. In general, the mutants exhibited similar concentrations of total soluble amino acids when compared to the wild-type lines, with the clear exception of mutants o11 and fl1, with the o11 mutant exhibiting a higher concentration of total soluble amino acids when compared to its wild-type counterpart... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Lysine; Threonine; Methionine. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162003000100014 |
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| Cruz,Eleandro Silva da; Medici,Leonardo Oliveira; Leles,Paulo Sérgio dos Santos; Ambrozim,Clodoaldo Spadeto; Souza,Wendell Luccas; Carvalho,Daniel Fonseca de. |
| ABSTRACT Optimization of the use of water and the possibility of using residues as substrate in the black pepper production chain can yield economic and environmental benefits. The objective of this study was to evaluate the biometric and physiological traits of black pepper plantlets (Piper nigrum L.), cv. Bragantina, at different irrigation levels and soilless substrates. Plantlets were grown for 120 days on three substrates [biosolid + crushed coconut fiber (3:1, by volume); biosolid + granitic rock powder (3:1, by volume); and biosolid + crushed coconut fiber + granitic rock powder (2:1:1, by volume)] and at five irrigation levels [36 % (very low); 55 % (low); 85 % (moderate); 100 % (well-irrigated); and 126 % of the reference irrigation level... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Piper nigrum L; Deficit irrigation; Potting mix; Biosolid; Granitic rock powder. |
| Ano: 2022 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162022000100601 |
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| Gonçalves,Fabíola Vieira; Medici,Leonardo Oliveira; Almeida,Wilk Sampaio de; Carvalho,Daniel Fonseca de; Santos,Hugo Thaner dos; Gomes,Daniela Pinto. |
| O presente estudo teve como objetivo comparar um sistema automático de baixo custo a outras duas técnicas de manejo (sistema Irrigás e tanque classe A) na cultura da alface (Lactuca sativa L.) com relação à operacionalidade dos sistemas, custo dos equipamentos, lâminas aplicadas e dados de produção da cultura. O cultivo foi desenvolvido num delineamento experimental de blocos ao acaso, com quatro tratamentos casualizados em seis blocos. Os tratamentos foram caracterizados pelo sistema Irrigás, tanque Classe A (TCA) e pelo uso de um acionador automático de baixo custo para irrigação (AAI), em duas tensões de água no solo (9,0kPa e 12,0kPa). Foram avaliados dados de lâmina aplicada, eficiência no uso da água e as variáveis de produção, área foliar, massa... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Manejo da irrigação; Automação; Lactuca sativa L.. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782014001101950 |
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| Dias,Gustavo Cardoso de Oliveira; Medici,Leonardo Oliveira; Vasconcellos,Marco Antonio da Silva; Carvalho,Daniel Fonseca de; Pimentel,Carlos. |
| The study assessed growth and physiological parameters of 'Sunrise Golden' and 'Tainung 01' papaya seedlings grown in 280mL plastic tubes and watered using a low-cost automatic irrigation system adjusted to operate at substrate water tension for starting irrigation (STI) of 3.0, 6.0 or 9.0 kPa. The water depths applied by the dripping system and drainage were monitored during germination and seedling growth. Germination, emergence velocity index (EVI), leaf area, plant height, shoot and root dry weight, stomatal conductance, relative water content (RWC) and relative chlorophyll content (RCC) were evaluated. Soil nutrient levels were determined by electrical conductivity (EC). Water use efficiency (WUE) corresponded to the ratio of plant dry mass to depth... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Carica papaya L.; Seedling production; Irrigation automation; Moisture sensors. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000200023 |
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| Medici,Leonardo Oliveira; Azevedo,Ricardo Antunes; Canellas,Luciano Pasqualoto; Machado,Altair Toledo; Pimentel,Carlos. |
| The objective of this work was to evaluate the effect of drought and nitrogen (N) stresses on stomatal conductance of three maize cultivars grown in the field. The stomatal conductance of Sol da Manhã variety (BRS 4157) and Pioneer 6875 hybrid, under drought and high N, was lower than under drought and low N, which indicates drought tolerance, since these cultivars did not exhibit reduction in grain yield by drought, as observed for Amarelão variety, which flowered under more severe drought. 'Sol da Manhã' exhibited shorter anthesis-silking interval under high N than under low N, an additional indication of tolerance. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Zea mays; Drought tolerance; Anthesis-silking interval. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2007000400020 |
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| Registros recuperados: 10 | |
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