Publication Date
1985
Location
Kyoto Japan
Description
In order to appreciate how population regulation of grass varieties occur in sward conditions, seven varieties of Rhodes grass were sown at four densities and grown with four cuttings during the first year, and records were taken of the density of surviving genets, the density of tillers, the mean genet weight and the mean tiller weight. During the experiment the two density-dependent processes of population regulation were observed, viz, densitydependent mortality of genets and density-dependent tillering of surviving genets. As results of these processes, tiller density converged towards a value characteristic of the variety but nearly free from influence of the initial sowing density at the end of the year. At that time, heritability estimates were high for the tiller density and the mean tiller weight in contrast with those for the genet density, the mean genet weight and the mean tiller number per genet, and high negative genetic correlation was observed between the tiller density and the mean tiller weight. The results suggest that the tiller is an important unit of population regulation in sward conditions, which is characteristic of the variety.
Citation
Kataoka, M; Ibaraki, K; and Tokunaga, H, "Population Regulations of Rhode grass (Chloris gayana) Varieties in Sward Conditions" (1985). IGC Proceedings (1985-2023). 78.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/78)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Population Regulations of Rhode grass (Chloris gayana) Varieties in Sward Conditions
Kyoto Japan
In order to appreciate how population regulation of grass varieties occur in sward conditions, seven varieties of Rhodes grass were sown at four densities and grown with four cuttings during the first year, and records were taken of the density of surviving genets, the density of tillers, the mean genet weight and the mean tiller weight. During the experiment the two density-dependent processes of population regulation were observed, viz, densitydependent mortality of genets and density-dependent tillering of surviving genets. As results of these processes, tiller density converged towards a value characteristic of the variety but nearly free from influence of the initial sowing density at the end of the year. At that time, heritability estimates were high for the tiller density and the mean tiller weight in contrast with those for the genet density, the mean genet weight and the mean tiller number per genet, and high negative genetic correlation was observed between the tiller density and the mean tiller weight. The results suggest that the tiller is an important unit of population regulation in sward conditions, which is characteristic of the variety.
