Sample records for silver 123
from WorldWideScience.org

Sample records 1 - 2 shown.



1

Combinações entre cultivares, ambientes, preparo e cobertura do solo em características agronômicas de alface/ Combination of cultivars, environments, tillage and mulching of soil influencing agronomical characteristics of lettuce

Ferreira, Regina Lúcia F; Araújo Neto, Sebastião Elviro de; Silva, Sonaira S da; Abud, Éllen A; Rezende, Maria Izabel de FL; Kusdra, Jorge F
2009-09-01

Resumo em português Objetivou-se identificar combinações entre cultivares, ambientes de cultivo e preparo e cobertura de solo capazes de melhorar o desempenho agronômico e aumentar a produtividade da cultura da alface em cultivo orgânico. A pesquisa foi conduzida na Universidade Federal do Acre, utilizando o delineamento experimental de blocos casualizados, com parcelas subdivididas para cada experimento (campo e casa de vegetação), com quatro repetições. Em cada experimento, três c (mais) ultivares de alface (Simpson, Marisa e Vera), constituindo as sub-parcelas, foram sorteadas nas parcelas, representadas por quatro preparos e cobertura do solo (encanteiramento com cobertura de palha de arroz, polietileno prateado, solo descoberto e plantio direto). A produtividade comercial de alface foi de 12,3 t ha-1 em cultivo protegido e de 7,9 t ha-1 em campo. O cultivo protegido promoveu melhor desenvolvimento das plantas, caracterizado por maior massa da matéria fresca e seca da parte aérea, massa da matéria fresca comercial e melhor classificação comercial, além de promover bom desempenho agronômico e maior produtividade em qualquer um dos preparos de solo. As cultivares Simpson e Marisa apresentaram massa da matéria seca da parte aérea semelhante e superior à 'Vera', porém, o crescimento do caule da 'Simpson' foi elevado, caracterizando pendoamento precoce, fato que reduz sua qualidade comercial. As cultivares Marisa e Vera não alongaram o caule indicando serem tolerantes às condições ambientais de Rio Branco. A cobertura do solo com casca de arroz ou plástico prateado contribuiu para minimizar os efeitos climáticos prejudiciais ao cultivo da alface em campo. O plantio direto orgânico não diferiu do plantio em canteiro descoberto. Resumo em inglês Combinations among cultivars, environments and soil tillage capable of improving the agronomic performance and to increase the yield of lettuce under organic cultivation were studied. The research was carried out in Rio Branco, Acre State, using the experimental design of randomized blocks with four replicates, in split-plot arrangement. In each experiment (field and greenhouse), three lettuce cultivars (Simpson, Marisa and Vera), constituting the split-plot, were raffled (mais) in the plot represented by four soil tillage and mulching treatments (conventional tillage using mulch of rice husk, silvered polyethylene, unmulched soil and no-tillage). The commercial yield of lettuce was of 12.3 t ha-1 in greenhouse and of 7.9 t ha-1 in field. The cultivation in greenhouse improved the development of the plants, characterized by higher fresh and dry matter mass of shoots, commercial fresh matter mass and better commercial classification, besides good agronomic performance and high yield with any of the mulching. The cultivars Simpson and Marisa presented the same dry matter mass of shoots and were superior to 'Vera'. However, cultivar Simpson presented elevated stem growth characterizing precocious flowering, reducing the commercial quality. Cultivars Marisa and Vera with reduced stem prolongation are tolerant to the environmental conditions of Rio Branco. Mulching the soil with rice husk or silver plastic in field contributed to minimize the harmful climatic effect to the cultivation of lettuce. The organic no-tillage cultivation did not differ from that one in unmulched soil.

Scientific Electronic Library Online (Portuguese)

2

Biologia de Plutella xylostella L. (Lepidoptera: Plutellidae) em cultivaresde couve-flor/ Biology of Plutella xylostella L. (Lepidoptera: Plutellidae) reared on cauliflower genotypes

Chagas Filho, Norton R; Boiça Jr, Arlindo L; Alonso, Tania F
2010-04-01

Resumo em inglês This work was conducted to evaluate biological parameters of Plutella xylostella L. reared on leaves of several cauliflower genotypes under laboratory conditions. The experiment was set in a randomized block design and arranged in a 6 x 2 factorial (genotypes x generations). Leaf disks of the cultivars Barcelona, Verona, Piracicaba Precoce, Sharon, Silver Streak, and Teresópolis Gigante were placed in Petri dishes with 12 newly-hatched larvae. Leaf disks were initially c (mais) hanged after the fourth day, but daily afterwards until the larvae reached the pupal stage. The same procedure was adopted for the second generation. Twenty adults of each sex were separated from each genotype to evaluate their longevity, and 10 couples from each treatment were used to assess female fecundity. The lowest larval survival was obtained on the 'Silver Streak' (78.9%) and highest on 'Verona' (97.1%). The 'Silver Streak' and 'Teresópolis Gigante' showed the lowest pupal weights (4.83 mg and 5.11 mg, respectively), as well as the lowest fecundity, 119.4 and 123.0 eggs/female, respectively, while 'Piracicaba Precoce' the highest (167.7 eggs/female). Males obtained from larvae reared on 'Teresópolis Gigante' and 'Silver Streak' lived shorter (5.1 days), while the short-lived females were obtained from larvae reared on 'Barcelona' and 'Verona' (4.9 and 5.0 days). Insect development was prolonged in the second generation in all tested genotypes.

Scientific Electronic Library Online (Portuguese)