Differences among temperate grass species in growth response to nitrogen nutrition during the second growing period
1999
Kawata, Y. (College of Dairying, Ebetsu, Hokkaido (Japan)) | Matsunaka, T.
A field experiment was conducted in orchardgrass (Dactylis glomerata L.), timothy (Phleum pratense L.) and meadow rescue (Festuca elatior L.) after the first cutting to investigate the effects of applied nitrogen on the relationships among the leaf area index (LAI the net assimilation rate (NAR) and the crop growth rate (CGR), and to assess the interactions between nitrogen absorption and those three parameters. Two treatment levels of nitrogen (0 g m(-2) and 6 g m(-2)) were used in this study. The dry matter yield was the greatest in orchardgrass, followed by meadow rescue and timothy in the treatment applied nitrogen. This ranking was derived from the CGR responses to nitrogen applied in the three grasses tested. Nitrogen application increased the LAI, but had no great influence on the NAR. The CGR rose according to the increased LAI, resulting in a higher yield of dry matter at the time of second cutting. It appeared that the differences among timothy and other two grasses in the CGR after nitrogen application were attributable to the differences in the characteristics of nitrogen uptake and translocation of absorbed nitrogen during this growing period. The difference in the CGR between orchardgrass and meadow rescue was due to the difference in the increasing efficiency of leaf area per unit absorbed nitrogen
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