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Hydroponic lettuce production in different concentrations and flow rates of nutrient solution Horticultura Brasileira
Genuncio,Gláucio da C; Gomes,Marcelle; Ferrari,Anderson Claiton; Majerowicz,Nidia; Zonta,Everaldo.
The objective of this study was to evaluate the accumulation of fresh weight of hydroponic lettuce in terms of ionic concentrations and flow rates of nutrient solution. This work consisted of three experiments in NFT hydroponic system, conducted between July and September 2006. Lettuce cultivars Lucy Brown, Izabela and Veneza were grown in different ionic concentrations of the 100, 75 and 50% and flow rates of 1.50, 1.00 and 0.75 L min-1. Fresh weight gains were observed for Lucy Brown when grown on 100% of the ion concentration and a flow rate of nutrient solution of 1.0 L min-1. Greater fresh mass was observed for cvs. Izabela and Veneza under the flow rate of 1.5 L min-1. A general analysis of the data allows us to conclude that the application of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Lactuca sativa; Nutritional management; Production; Ion concentration.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362012000300028
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Relationship between Coffee Leaf Analysis and Soil Chemical Analysis Rev. Bras. Ciênc. Solo
Sousa,Jailson Silva; Neves,Júlio César Lima; Martinez,Herminia Emilia Prieto; Alvarez,Víctor Hugo V..
ABSTRACT: Research focused on adequate nutrition of plants is essential in modern coffee production to increase yield and develop more efficient management strategies with greater environmental and economic sustainability. The objectives of this study were to establish critical and optimal levels of soil fertility properties for high yielding Arabica coffee crops using the Boundary Line method and, then, relate the macronutrient contents in the diagnostic leaf of coffee to the macronutrients available in the soil using the Quadrant Diagram of the Plant-Soil Relationship (QDpsR). The study made use of a soil chemical analysis database, leaf macronutrient contents, and Arabica coffee yield from five representative coffee-growing regions in Minas Gerais. An...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coffea arabica L.; Leaf nutrient content; Soil nutrient content; Nutritional management.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100520
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Reproductive behavior of crossbred dairy cows grazing an intensive silvopastoral system under tropical dry forest conditions Arq. Bras. Med. Vet. Zootec.
Sierra-Montoya,E.; Barahona-Rosales,R.; Ruiz-Cortés,Z.T..
ABSTRACT It is widely accepted that selection for high milk yield in dairy cows has negatively affected their reproductive performance. After calving, dairy cows experience a nutritional imbalance due to an asynchrony in the occurrence of the lactation and dry matter intake peaks. In the tropics, this situation is exacerbated due to poor quality and/ or availability of the diet. A study was carried out to describe the nutritional and reproductive behavior of two-to-four parturition crossbred cows (Gyr (Bos indicus) x Holstein (Bos taurus)) divided in two groups according to their calving to first service interval (CFSI): Group 1: ≤50 days CFSI, n=7; Group 2: ≥50 days CFSI, n=8. Animals were grazing in an intensive silvopastoral system (ISS) based on...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Days open; Energy balance; Intake; Leucaena; Nutritional management.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000100001
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