Influ那ncia do espa amento e popula o de plantas sobre doen as de final de ciclo e o赤dio e caracteres agron micos em soja = Influence of row spacing and plant population on late season disease severity, powdery mildew and agronomic characters in soybean

作者：Jorge Luiz Knebel; Vandeir Francisco Guimares; Marcelo Andreotti; Jose Renato Stangarlin

来源：Acta Scientiarum - Agronomy, 2006.

• doen as soja
• DFC
• oidio
• espa amento
• densidade
• soybean diseases
• row spacing
• density
• plant population

Este trabalho foi conduzido em Cascavel, Estado do Paran芍, na safra de2004/2005, utilizando a cultivar de soja CD 202, para avaliar a influ那ncia do espa amento e da popula o de plantas sobre a severidade de (DFC) doen as de final de ciclo (Septoria glycines e Cercospora kikuchii) e o赤dio da soja (Microsphaera diffusa) e caracteres agron micos da cultura. Os tratamentos foram 3 espa amentos (22,5; 45,0 e 67,5 cm) e 3 popula es (200; 400; e 600 mil plantas ha-1). As DFC tiveram menor severidade no espa amento reduzido e na popula o mais baixa, enquanto a ocorr那ncia de o赤dio n o se alterou. Em todos os espa amentos, quanto maior a popula o de plantas, maior a altura final e, conseq邦entemente, maior o acamamento de plantas. O n迆mero de legumes/planta foi superior no maior espa amento e reduziu com o aumento da popula o; o n迆mero de gr os/planta diminuiu com o aumento da popula o; e a produtividade foi superior no menor espa amento. This study was carried out in Cascavel, Paran芍 State, during the growing season 2004/2005, using soybean cultivar CD 202. The aim was to evaluate the influence of row-spacing and plant population on lateseason disease severity (Septoria glycines and Cercospora kikuchii), soybean powdery mildew (Microsphaera diffusa) and agronomic characters of the culture. The treatments were three row spacing (22.5; 45.0 and 67.5 cm) and three plant populations (200; 400; and 600 thousand plants ha-1). Late season disease had smaller severity in the reduced spacing and in the lowest population, while the powdery mildew occurrence did not modify with these factors. In all spacing, as larger the plants density, larger the plants height and consequently larger the plants fallen. The number pods per plant was higher with the largest spacing and it decreased with the population increase; the number of grains per plant decreased with the population increase; and the productivity was higher in the smallest spacing.