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Hydroponic lettuce production in different concentrations and flow rates of nutrient solution
Genuncio, Gláucio da C;Gomes, Marcelle;Ferrari, Anderson Claiton;Majerowicz, Nidia;Zonta, Everaldo;
Horticultura Brasileira , 2012, DOI: 10.1590/S0102-05362012000300028
Abstract: 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 nutrient solution at a flow rate of 1.5 l min-1, as well as 100% of the ionic concentration is effective to increase the fresh weight of the aerial part of cvs. lucy brown, izabela and veneza when grown in hydroponics.
Produ??o de cultivares de tomateiro em hidroponia e fertirriga??o sob raz?es de nitrogênio e potássio
Genuncio, Gláucio C;Silva, Renata AC;Sá, Núbia M;Zonta, Everaldo;Araújo, Adelson P;
Horticultura Brasileira , 2010, DOI: 10.1590/S0102-05362010000400012
Abstract: protected tomato cultivation presents a high potassium demand for obtaining high fruit yield and quality, but the ratio between nitrogen and potassium supplies which provides such results has not been sufficiently evaluated. the fruit yield and quality of four tomato cultivars were evaluated in hydroponics and fertigation systems at two ratios between n and k provided to the plants. two experiments were carried out simultaneously in greenhouse, in 4x2 factorial design with four replicates, comprising four genotypes (cultivars cereja 261, san marzano, santa clara and the hybrid cereja chipano) and two n:k ratios (1:1.5 and 1:2 in hydroponics, and 1:2 and 1:3 in fertigation). average yield of marketable fruits was 2.5 and 1.8 kg/plant in the hydroponics and fertigation system, respectively, reaching 3.3 kg/plant for cv. santa clara in hydroponics. in hydroponics, the n:k ratios nor did affect fruit production nor the soluble solids concentration, but the marketable fruit yield increased 6.5% at the n:k ratio 1:2. the n:k ratio 1:2 in hydroponics increased the average mass and diameter of marketable fruits, reducing k concentration in fruits. in the fertigation system, the n:k ratio 1:3 stimulated the vegetative growth of tomato plants but did not affect the fruit quality and yield. the cultivars san marzano and santa clara presented higher fruit yield in both experiments. fruit yield and total soluble solids of san marzano and santa clara were higher in the hydroponics system when compared to fertigation. the hydroponics system provided higher fruit yield than the fertigation system for san marzano and santa clara and, in hydroponics, the n:k ratio 1:2 improved fruits with higher marketable quality
Produtividade de rúcula hidrop?nica cultivada em diferentes épocas e vaz?es de solu??o nutritiva
Genuncio, Gláucio da C;Silva, Renata Aparecida C;Sá, Núbia M e;Mary, Wellington;Zonta, Everaldo;
Horticultura Brasileira , 2011, DOI: 10.1590/S0102-05362011000400027
Abstract: the rocket is one of the main vegetable crops produced in brazil through hydroponics. nevertheless, besides the application of an appropriate nutrient solution for the crop, the knowledge and control of intrinsic variables for the management of the nutrient solution is essential. the accumulation of fresh biomass of the aboveground part, roots and the yield of rocket grown in three flow rates of nutrient solution during six crop cycles was studied. the treatments consisted of three flows rates of nutrient solution, v1= 0.75, v2= 1.00 and v3= 1.50 l min-1. we also evaluated six cycles of cultivation (from july to december). the experimental design was randomized blocks with eight replications. harvest occurred 30 days after the transplanting date to the hydroponic channels. the yield of biomass of the aboveground part and of roots was higher in the months of november and december, due to the higher temperatures into the greenhouse. the lowest value of aboveground part biomass was registered in the lowest flow rate of nutrient solution. the aboveground part and total (aboveground part + root) biomass were higher in the warmer months. an increase of yield was observed with the improvement of the flow rate of nutrient solution through the channels.
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