produtividade e qualidade pós-colheita da alface americana em função de doses de nitrogênio e molibdênio yield and postharvest quality of summer growing crisphead lettuce as affected by doses of nitrogen and molybdenum
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ID: 156823
2005
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Abstract
O trabalho foi conduzido no município de Três Pontas (MG), de outubro a dezembro de 2002, para avaliar a influência de doses de nitrogênio e molibdênio nas características produtivas e qualidade pós-colheita da alface americana (Lactuca sativa L.). Utilizou-se o delineamento de blocos ao acaso em arranjo fatorial 4 x 5, compreendendo quatro doses de nitrogênio em cobertura adicionais à dose aplicada pelo produtor de 60 kg/ha de N (0; 60; 120 e 180 kg/ha) e cinco doses de molibdênio via foliar (0,0; 35,1; 70,2; 105,3 e 140,4 g/ha) e três repetições. O maior peso fresco total foi obtido com a dose de 86,9 kg/ha de nitrogênio em cobertura e 87,4 g/ha de molibdênio. Com relação ao peso fresco comercial a dose de 89,1 kg/ha de nitrogênio em cobertura propiciou a maior resposta, sendo para molibdênio a máxima produtividade alcançada com a dose de 94,2 g/ha. As doses de 85,3 kg/ha de nitrogênio em cobertura e 72,9 g/ha de molibdênio proporcionaram a maior circunferência de cabeça comercial. Não se observou efeito significativo dos tratamentos para comprimento do caule e na conservação pós-colheita. As doses de 89,9 kg/ha de N em cobertura e 77,2 g/ha de Mo em pulverização foliar propiciaram a maior porcentagem de matéria seca.
The influence of nitrogen and molybdenum doses was evaluated on the productive characteristics and postharvest quality of crisphead lettuce (Lactuca sativa L.), at Três Pontas, Minas Gerais State, Brazil, from October to December 2002. A randomized complete block design in a 4 x 5 factorial arrangement with three replications was used. The factorial consisted of four doses of nitrogen (0; 60; 120 and 180 kg/ha) in top dressing, in addition to the usual farmers doses (60 kg/ha), and five doses of molybdenum in foliar application (0.0; 35.1; 70.2; 105.3, and 140.4 g/ha). The highest total fresh weight was obtained with the doses of 86.9 kg/ha of nitrogen in top dressing and 87.4 g/ha of molybdenum. Highest commercial fresh weight was obtained using the doses of 89.1 g/ha of nitrogen in top dressing, while the doses of 94.2 g/ha of molybdenum resulted in the highest yield. The doses of 85.3 kg/ha of nitrogen in top dressing and 72.9 g/ha of molybdenum were the best for highest commercial head circumference. There was no significant effect of the treatments on stem length and post-harvest conservation. The highest percentage of dry matter was obtained with the doses of 89.9 kg/ha of N in top dressing and 77.2 g/ha of Mo in foliar spray.
The influence of nitrogen and molybdenum doses was evaluated on the productive characteristics and postharvest quality of crisphead lettuce (Lactuca sativa L.), at Três Pontas, Minas Gerais State, Brazil, from October to December 2002. A randomized complete block design in a 4 x 5 factorial arrangement with three replications was used. The factorial consisted of four doses of nitrogen (0; 60; 120 and 180 kg/ha) in top dressing, in addition to the usual farmers doses (60 kg/ha), and five doses of molybdenum in foliar application (0.0; 35.1; 70.2; 105.3, and 140.4 g/ha). The highest total fresh weight was obtained with the doses of 86.9 kg/ha of nitrogen in top dressing and 87.4 g/ha of molybdenum. Highest commercial fresh weight was obtained using the doses of 89.1 g/ha of nitrogen in top dressing, while the doses of 94.2 g/ha of molybdenum resulted in the highest yield. The doses of 85.3 kg/ha of nitrogen in top dressing and 72.9 g/ha of molybdenum were the best for highest commercial head circumference. There was no significant effect of the treatments on stem length and post-harvest conservation. The highest percentage of dry matter was obtained with the doses of 89.9 kg/ha of N in top dressing and 77.2 g/ha of Mo in foliar spray.
| Reference Key |
resende2005horticulturaprodutividade
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|---|---|
| Authors | ;Geraldo M. de Resende;Marco Antônio R. Alvarenga;Jony E. Yuri;José Hortêncio Mota;Rovilson José de Souza;Juarez C. Rodrigues Júnior |
| Journal | research on biomedical engineering |
| Year | 2005 |
| DOI |
10.1590/S0102-05362005000400023
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