Row spacing and plant population density for differentiated plant architecture cotton cultivars / Espaçamentos e densidades populacionais em cultivares de algodoeiro com direfentes arquiteturas de plantas

AUTOR(ES)

Raquel Capistrano Moreira

DATA DE PUBLICAÇÃO

2008

RESUMO

The aim of this work was to evaluate different row spacings and plant population densities for three cotton cultivars with different plant architecture. The experiments were carried out in experimental areas belonging to Instituto Agronômico, in Campinas- SP, at Pólo Regional do Noroeste Paulista, from APTA, in Votuporanga-SP and at Unesp Campus de Ilha Solteira, in Selvíria-MS. A randomized block design was used, with four replicates, in a factorial 2x2x3 scheme, with two row spacings (0.45 and 0.90 m), two plant population densities (6 and 10 plants.m-1) and three cotton cultivars (IAC 24, DeltaOpal e Fibermax 966). Four plants per plot were labeled and analyzed for the plant height, insertion height of the first fruit branch, stem diameter, number of fruit branches and open bolls per plant. In Votuporanga were also analyzed the boll rot incidence and the pericarp thickness of young bolls. Samples of 20 open bolls randomized chosen per plot were analyzed for yield components: average open boll mass, 100 seeds mass, and fiber percentage, just on the Campinas experiment; and for fiber technological characteristics: length, length uniformity, strength, micronaire and maturity. In Campinas the cotton yield was determinated in the useful area of each plot. According to the experimental data obtained it was possible to conclude: the use of wider row spacing leads to a greater plant height, larger stem diameter, greater number of fruit branches and bolls per plant. The use of row spacing varying from 0.45 to 0.90 and plant densities varying from 6 to10 plants.m-1 do not affect cotton yield; under lower plant competition and higher light levels in the canopy, that is, in wider row spacing and/or lower plant population, the fiber production is prioritized by the cotton plant; independently of the cultivar and row spacing, the micronaire may increase with plant population reduction; the boll rot incidence, as well as its severity, are related to plant genotype, due to either plant architecture and pericarp thickness.

ASSUNTO(S)

densidade de plantio gossypium hirsutum l. plant population. populações vegetais espaçamento algodão narrow row variedades vegetais.

Documentos Relacionados

• Espaçamentos ultra-adensado, adensado e convencional com densidade populacional variável em algodoeiro.
• Microclimate and ocurrence of ramulose in different cotton plant population densities.
• Population densities for alternative cultivars of bean plant in Minas Gerais
• Row spacing, plant population and maize grain yield.
• Resposta de cultivares de gergelim em diferentes densidades populacionais, espaçamentos e manejo de solo.