Response of bahiagrass (Paspalum notatum Fluegge) sward to cutting height, 3: Density of tillers, stolons and primary roots
1993
Hirata, M. (Miyazaki Univ. (Japan). Faculty of Agriculture)
This paper aimed to investigate the tiller number, stolon length and number of primary roots of bahiagrass swards subjected to the five different cutting heights ranging from 2 to 22 cm. The tiller number needed about three months and the stolon length and the number of primary coots needed one year before they constantly showed significant responses to the cutting height. When they significantly responded, all the density characteristics tended to increase as the cutting height was lowered. There were significant positive correlations between the three characteristics. According to the linear regression through the origin, on an average over the five cutting heights, 1 mm stolon corresponded to 0.022 tiller and 0.318 primary root, and one tiller corresponded to 12.24 primary roots. The rate of increase in the density characteristics remained nearly zero when the rate of increase in the dry weight (RIDW) of the corresponding plant parts was zero. As the RiDW increased, the rate of increase in the density characteristics rose more sharply in swards under lower cutting heights. The cutting heights required for the density increment were less than 7 cm for the tiller number, less than 22 cm for the stolon length and less than 12 cm for the number of primary roots. the results were first compared with those from other swards to clear the nature of the bahiagrass swards examined. Then, the usefulness of the results for understanding and controlling the density dynamics of bahiagrass swards was discussed
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