Publication Date
1985
Location
Kyoto Japan
Description
There are not so many reports about the matter production in the grazed pastures of short grass type. The purposes of this study are to clarify (1) the seasonal change of dry matter production and (2) the factors that affect those in the grazed redtop (Agrostis alba) pasture as short grass type. The grazing experiment was carried out in 1979, 1980 and 1981. Biomass of grasses (part of leaf, stem, standing dead and underground) was measured at the end of each grazing period in the rotation from May to October, and also in March, April and November. Principal component analysis (PCA) was applied to these data (n=46) concerning on the seasonal variation in dry matter weight. Total biomass was 1200 g/m2 at maximum, and its seasonal change was mainly affected by that of underground. The quantity of standing de"1d was very low through the grazing period, though it was high in spring and in autumn. Annual net production was about 900 g/m2. By PCA, the first principal component (PCl) was the factor on the total living biomass, and the second principal component (PC2) was the factor on the dead biomass. With PCl and 2 by PCA, the seasonal change of dry matter production in the grazed redtop pasture was summarized in five periods. They were (1) from spring to early summer, (2) in the first half period in the rotation, (3) in the latter half period in the rotation, ( 4) in early spring and (5) in late autumn. In the grazed redtop pasture, underground biomass had the important roles on the seasonal change of dry matter production, and also stem biomass affected the seasonal change of aboveground biomass rather than leaf biomass.
Citation
Okajima, T; Okubo, T; Kayama, R; and Kikuchi, M, "Seasonal Dry Matter Production in Grazed Pasture of Agrostis alba and its Principal Component Analysis" (1985). IGC Proceedings (1985-2023). 111.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/111)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Seasonal Dry Matter Production in Grazed Pasture of Agrostis alba and its Principal Component Analysis
Kyoto Japan
There are not so many reports about the matter production in the grazed pastures of short grass type. The purposes of this study are to clarify (1) the seasonal change of dry matter production and (2) the factors that affect those in the grazed redtop (Agrostis alba) pasture as short grass type. The grazing experiment was carried out in 1979, 1980 and 1981. Biomass of grasses (part of leaf, stem, standing dead and underground) was measured at the end of each grazing period in the rotation from May to October, and also in March, April and November. Principal component analysis (PCA) was applied to these data (n=46) concerning on the seasonal variation in dry matter weight. Total biomass was 1200 g/m2 at maximum, and its seasonal change was mainly affected by that of underground. The quantity of standing de"1d was very low through the grazing period, though it was high in spring and in autumn. Annual net production was about 900 g/m2. By PCA, the first principal component (PCl) was the factor on the total living biomass, and the second principal component (PC2) was the factor on the dead biomass. With PCl and 2 by PCA, the seasonal change of dry matter production in the grazed redtop pasture was summarized in five periods. They were (1) from spring to early summer, (2) in the first half period in the rotation, (3) in the latter half period in the rotation, ( 4) in early spring and (5) in late autumn. In the grazed redtop pasture, underground biomass had the important roles on the seasonal change of dry matter production, and also stem biomass affected the seasonal change of aboveground biomass rather than leaf biomass.
