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Search Results: 1 - 10 of 29164 matches for " Fernando Mendes Lamas "
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Estudo comparativo entre cloreto de mepiquat e cloreto de chlormequat aplicados no algodoeiro
Lamas, Fernando Mendes;
Pesquisa Agropecuária Brasileira , 2001, DOI: 10.1590/S0100-204X2001000200008
Abstract: this work was carried out to compare the effects of the growth regulators mepiquat chloride and chlormequat chloride applied in combination or separately in the cotton (gossypium hirsutum l.) cultivar cnpa ita 90. the experiment was evaluated in mato grosso state, brazil, in the agricultural year of 1998/99. fifteen treatments were studied with four replications, using randomized complete block design. the height of the plants with the parceled application was 24% smaller in relation to the control treatment, independently on the chemical. the boll weight was greater with the application of growth regulator, not depending on the product and the application outline. the weight of 100 seeds depends on the application sequence and on the chemical; it was larger when the first two applications were with chlormequat chloride. there was not significant effect of the growth regulators in the fiber percentage; however, the fiber productivity was influenced by the product and by the application outline; with three or two applications of the same product, the largest productivity was obtained with mepiquat chloride.
Estudo comparativo entre cloreto de mepiquat e cloreto de chlormequat aplicados no algodoeiro
Lamas Fernando Mendes
Pesquisa Agropecuária Brasileira , 2001,
Abstract: A compara o dos efeitos da aplica o dos reguladores de crescimento cloreto de mepiquat e cloreto de chlormequat isolados e combinados no algodoeiro (Gossypium hirsutum L.) cv. CNPA ITA 90 constituiu o objetivo do presente trabalho. O experimento foi conduzido no ano agrícola de 1998/99 no Município de Primavera do Leste, MT. Foram estudados 15 tratamentos com quatro repeti es, utilizando-se o delineamento experimental de blocos casualizados. A altura das plantas com a aplica o parcelada foi 24% menor em rela o à testemunha, independentemente do produto estudado. O peso do capulho foi maior com a aplica o de regulador de crescimento, e n o dependeu do produto e do esquema de aplica o. O peso de 100 sementes depende da seqüência de aplica o e do produto utilizado; nos tratamentos em que as duas primeiras aplica es foram com cloreto de chlormequat, o peso de 100 sementes foi maior. N o houve efeito significativo dos reguladores de crescimento na porcentagem de fibras; entretanto, a produtividade de fibras foi influenciada pelo produto e pelo esquema de parcelamento; com três e duas aplica es do mesmo produto, a maior produtividade foi obtida com cloreto de mepiquat.
EFEITO DO CLORETO DE MEPIQUAT E DO THIDIAZURON SOBRE ALGUMAS CARACTERíSTICAS DAS SEMENTES DO ALGODOEIRO
LAMAS, FERNANDO MENDES;ATHAYDE, MANOEL LUIZ FERREIRA;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999001100006
Abstract: with the objective of evaluating the effect of different doses of mepiquat chloride (0, 50, 75, 100 and 125 g/ha), and thidiazuron (0, 45, 60 and 75 g/ha) on the physiological characteristics of cotton seed, an experiment was carried out at unesp, jaboticabal, s?o paulo state, brazil. the experimental design was a completely randomized block design and the treatments were arranged in a 5x4 factorial replicated four times. the results showed that in increasing mepiquat chloride doses resulted in higher 100 seed weight and faster emergence indices. as for seedling dry matter, mepiquat chloride and thidiazuron showed antagonic effects. the germination percentage and the hypocotil length were not affected significantly by either chemical, alone or in combination.
Aplica??o seqüencial de cloreto de mepiquat em algodoeiro
Athayde, Manoel Luiz Ferreira;Lamas, Fernando Mendes;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999000300007
Abstract: the objective of this work was to evaluate the effect of split dosis of mepiquat chloride on the cotton cultivar iac 22 at jaboticabal, sp. the experimental design was in completely randomized blocks constituted by 13 treatments, and four replicates. the effect of dosis on plant height was more pronounced than the splitting effect. the smallest dosis used (55 g/ha) was enough to declare plant height to less than 1.30 m, at harvest. the effect of mepiquat chloride reduced branch length and provided better reproductive/vegetative relation. the effects on boll weight, 100 seed weight, percentage of fiber and seed yield were not significant.
Rea??es do algodoeiro CNPA-ITA 90 ao cloreto de mepiquat
LAMAS, FERNANDO MENDES;ATHAYDE, MANOEL LUIZ FERREIRA;BANZATTO, DAVID ARIOVALDO;
Pesquisa Agropecuária Brasileira , 2000, DOI: 10.1590/S0100-204X2000000300005
Abstract: the effects of different doses of mepiquat chloride on cotton (gossypium hirsutum l.) plants, cultivar cnpa-ita 90, during the 1993/94 and 1994/95 growing seasons were evaluated at itamarati farm, ponta por?, ms, brazil. the doses were split in three application dates and the experimental design was in randomized blocks, with five treatments replicated four times. the treatments were as follows: 1) unsprayed control; 2) 12.5+12.5+25.0 (50.0); 3) 25.0+25.0+25.0 (75.0); 4) 0.0+50.0+50.0 (100.0); and 5) 12.5+62.5+50.0 (125.0) g ha-1 of mepiquat chloride. the spraying was done at 34, 47 and 62 days after emergence (dae) in 1993/94 and at 42, 60 and 73 dae in 1994/95, when the plants were at the average hight of 51, 84 and 93 cm and 61, 79 and 97 cm, respectively. increasing dose of mepiquat chloride caused decreasing in plant height; leaf stems and total above ground dry matter; number of nodes and branching; the branches length; the number of damaged fruits; the total number of bolls and the number of fully opened bolls.
Espécies vegetais para cobertura do solo: influência sobre plantas daninhas e a produtividade do algodoeiro em sistema plantio direto
Ferreira, Alexandre Cunha de Barcellos;Lamas, Fernando Mendes;
Revista Ceres , 2010, DOI: 10.1590/S0034-737X2010000600013
Abstract: the objective of this work was to evaluate the production, persistence and the effect of different cover crops on weed control and cotton yield in no-tillage system. the treatments included: pennisetum glaucum; brachiaria ruziziensis; sorghum bicolor; eleusine coracana; crotalaria juncea; crotalaria spectabilis; avena strigosa; raphanus sativus; p. glaucum + c. juncea; p. glaucum + c. spectabilis; b. ruziziensis + c. juncea; b. ruziziensis + c. spectabilis; s. bicolor + c. juncea; s. bicolor + c. spectabilis; e. coracana + c. juncea; e. coracana + c. spectabilis; a. strigosa + r. sativus; p. glaucum + r. sativus; fallow. the cover crops were sown in late summer, after soybean harvest. the cotton cultivar brs 269-buriti was sown nine months later. the experiment was carried out in a randomized complete block design with four replications. dry matter of b. ruziziensis, b. ruziziensis + c. juncea, b. ruziziensis + c. spectabilis and p. glaucum + r. sativus was above 6.8 t ha-1. the dry matter produced by b. ruziziensis provided sufficient soil cover during the cotton cycle. residues of b. ruziziensis, b. ruziziensis + c. juncea and b. ruziziensis + c. spectabilis reduced weed incidence until the time of cotton sowing, lasting until the initial stages of cotton development. the use of both r. sativus and a. strigosa, alone or in mixtures, resulted in reduced yield of cotton fiber.
Rea es do algodoeiro CNPA-ITA 90 ao cloreto de mepiquat
LAMAS FERNANDO MENDES,ATHAYDE MANOEL LUIZ FERREIRA,BANZATTO DAVID ARIOVALDO
Pesquisa Agropecuária Brasileira , 2000,
Abstract: Com o objetivo de avaliar os efeitos de diferentes doses de cloreto de mepiquat aplicadas parceladamente no algodoeiro (Gossypium hirsutum L.) cv. CNPA-ITA 90, dois experimentos foram conduzidos durante os anos agrícolas de 1993/94 e 1994/95, na Fazenda Itamarati, Ponta Por , MS. As doses estudadas foram: 1) 0,0; 2) 12,5+12,5+25,0 (50,0); 3) 25,0+25,0+25,0 (75,0); 4) 0,0+ 50,0+50,0 (100,0) e 5) 12,5+62,5+50,0 (125,0) g ha-1 de cloreto de mepiquat. O delineamento experimental utilizado foi o de blocos casualizados, com quatro repeti es. As aplica es foram efetuadas aos 34, 47 e 62 dias após a emergência (DAE), em 1993/94, e aos 42, 60 e 73 DAE no ano de 1994/95, quando as plantas apresentavam altura média de 51, 84 e 93 cm e 61, 79 e 97 cm, respectivamente. Com o aumento da dose de cloreto de mepiquat, verificou-se redu o da altura de plantas, da matéria seca foliar, do caule e do total da parte vegetativa, do número de nós, de ramos, do comprimento de ramos, do número de frutos danificados e do número de ma s, e aumento do número de capulhos totalmente abertos.
Cloreto de mepiquat, thidiazuron e ethephon aplicados no algodoeiro em Ponta Por?, MS
Lamas, Fernando Mendes;Athayde, Manoel Luiz Ferreira;Banzatto, David Ariovaldo;Fortuna, Paulo de Andrade;
Pesquisa Agropecuária Brasileira , 1999, DOI: 10.1590/S0100-204X1999001000014
Abstract: the objective of this study was to evaluate the effect of doses of mepiquat chloride, thidiazuron and ethephon on cotton (gossypium hirsutum l.), applied in parcels, and were surveyed in itamarati farm at ponta por? county. the mepiquat chloride doses were: (0.0; 12.5 + 12.5 + 25.0 = 50.0; 25.0 + 25.0 + 25.0 = 75.0; 0.0 + 50.0 + 50.0 = 100.0; 12.5 + 62.5 + 50.0 = 125.0) g ha-1. the applications were made at 34, 47 and 63 days after emergence(dae) in 1993/94 and at 42, 60 and 73 dae in 1994/95. thidiazuron was applied when 70% of bolls were opened at the doses 0.0, 45.0, 60.0 and 75.0 g ha-1. ethephon was applied seven days after thidiazuron, when 85% defoliation was observed, in the doses of 0.0, 960.0 and 1,440.0 g ha-1. the experimental design used was strips with subdivided subparcelas. mepiquat chloride decrease the number of unripe fruits, increased the weight of 100 seeds and the boll average weight. the defoliation percentage enhanced with increasing thidiazuron and ethephon doses. mepiquat chloride x thidiazuron x ethephon interaction was significative to the percentage of opening bolls and production of cotton seed.
CULTIVAR RELEASE - BRS 336: A high-quality fiber upland cotton cultivar for Brazilian savanna and semi-arid conditions
Camilo de Lelis Morello,Murilo Barros Pedrosa,Nelson Dias Suassuna,Fernando Mendes Lamas
Crop Breeding and Applied Biotechnology , 2012,
Abstract: Cotton cultivar BRS 336 is a high-quality fiber upland cultivar and has wide adaptation to the Brazilian growing areas, with resistance to bacterial blight. BRS 336 exhibited fiber length higher than 32.0 mm in all field tests. Also, fiber strength exceeded all upland cotton currently grown in Brazil.
Produ??o de biomassa por cultivos de cobertura do solo e produtividade do algodoeiro em plantio direto
Ferreira, Alexandre Cunha de Barcellos;Lamas, Fernando Mendes;Carvalho, Maria da Concei??o Santana;Salton, Júlio César;Suassuna, Nelson Dias;
Pesquisa Agropecuária Brasileira , 2010, DOI: 10.1590/S0100-204X2010000600003
Abstract: the objectives of this work were to evaluate biomass production and persistence and the desiccation efficiency in plant species used as cover crops, and to quantify its effects on cotton yield in a no-tillage system. the study was carried out in santa helena de goiás, go, brazil, using 16 plant species: panicum maximum, cultivars momba?a, tanzania and massai; urochloa brizantha, cultivars piat?, xaraés, marandu and mg4; u. decumbens; paspalum atratum cv. pojuca; sorghum bicolor cultivars santa eliza and brs 700; pennisetum glaucum cv. adr 500; raphanus sativus; eleusine coracana, crotalaria spectabilis, and fallow plants as control. the species were sown early in march-2007. the lower dry biomass productivity and persistence were obtained with c. spectabilis, e. coracana, and r. sativus. cotton seed and lint yield were higher when it was cultivated after the cultivars tanzania and momba?a of p. maximum, in comparison to the ones observed using p. atratum cv. pojuca, r. sativus, and fallow plants. generally, s. bicolor, p. glaucum and the cultivars tanzania and momba?a of p. maximum, and mg4, piat? and xaraés of u. brizantha have biomass persistence and productivity suitable for cotton cultivation in no-tillage systems in the brazilian savannah.
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