暖地型野草

These experiments were done to clarify the variation in the seasonal growth pattern, and the responses to temperature, nitrogen, and cutting of Hemarthria compressa R. BROWN, Panicum repens LINN. and Paspalum urvillei STEUD., compared with those of Bahia grass (Paspalum notatum FLÜGGE). Hemarthria compressa and Panicum repens were collected from the south-western islands of Japan, and Paspalum urvillei from the outskirts of Fukuoka. Seasonal variations in dry matter yield of these species were similar to those of Bahia grass. Yield of dry matter increased with rising temperatures. In Paspalum urvillei, the increase in dry matter yield was very rapid with increasing temperature at the early stage of growth in comparison with the other species. From the observation of temperature responses, it was found that the optimum temperatures for maximum growth were over 30℃ for Panicum repens and 25℃ for Hemarthria compressa and Paspalum urvillei. With nitrogen fertilizer responses, Hemerthria compressa and Paspalum urvillei showed almost similar trends those of Bahia grass. The dry matter yield of Panicum repens increased under high nitrogen level, whereas the dry matter yields of the other species decreased under the same nitrogen level. Frequency of cutting affected markedly the dry matter yields of these species in comparison with Bahia grass. Dry matter yields decreased with increased frequency of cutting.