Duration of the Grain Filling Period and Its Relation to Grain Yield in Corn, Zea mays L.¹

Abstract

A Significant linear relationship was found among several corn (Zea mays L.) hybrids grown in 1966 and 1967 at Guelph, Ontario at several planting densities, between grain yield and effective filling period duration. Effective filling period duration (EFPD) is defined as final grain yield divided by the average rate of grain dry weight accumulation during the linear period of grain formation, and hence, is a relative measure of the length of the grain filling period. In each year yield differences among hybrids were more closely related to EFPD differences than to differences in the rate of ear dry weight accumulation. EFPD was unaffected by planting density. Results suggest that significant potential exists in corn for higher grain yields through a genetic extension of the length of the grain filling period.

Effect of Simulated Frost Injury Induced by Paraquat on Kernel Growth and Development in Corn

“…3) decreased the earlier the paraquat treatment was imposed. This differs from the findings of Daynard et al (1971) and Tollenaar and Daynard (1978a) in For personal use only. …”

Crescimento e desenvolvimento de milho: acúmulo de massa seca do grão

“…Nas situações em que a capacidade dos grãos em alocar fotoassimilados é o fator limitante, como em plantios mais precoces na Região Sul do Brasil, pode-se aumentar a densidade de plantas, para que haja um aumento na interceptação e conversão da radiação, de modo a promover um equilíbrio na relação fonte/dreno, sem que a taxa e a duração do período de enchimento de grãos sejam substancialmente alteradas (Daynard et al, 1971;Schoper et al, 1982;Magalhães & Jones, 1990a;Stewart et al, 1997). O aumento da densidade de plantas, nesse caso, seria acompanhado por um aumento do número de grãos por unidade de área, e não pelo aumento no número de grãos por planta, que parece ser predeterminado, refletindo o potencial genético da planta (Magalhães & Jones, 1990b;Uhart & Andrade, 1995).…”

Source-sink relationships in maize grown in a cool-temperate area

“…This could be explained by the fact that the effective grain filling period was shortened as a response to a low amount of reserves to meet the reproductive sink demand (Daynard and Duncan, 1969;Daynard et al, 1971). The lowest values in green leaves dry matter and LAD observed for these treatments during R5-R6 period of the second year support this concept.…”