Publication Date
1985
Location
Kyoto Japan
Description
The effects of soil and aerial partitions separating shoot and root competition on plant weight of competing species were compared between the experimental data in six studies previously reported by some authors. Soil partition was found to be mainly operative in five experiments using two grass species so that a winner species can be promoted in growth while a loser species suppressed. In one study, in which a grass-clover combination was used, in contrast, aerial partition was effective in promoting the growth of a winner and in suppressing that of a loser. Corresponding to these effects, in general, plant weights biased positively in a winner species while negatively in a loser species. In case of two grass species combination, the bias were seen to be more marked in both root and full competition, in which no soil partition was used, than in both shoot and no competition with soilpartition. Most of the authors have concluded from these results that root competition played a major role in competition. However, the relative importance of shoot and root competition but aerial and soil partitions what we can find directly as a factor operating in experiments in which each competition is artificially separated. Thus, it is quite doubtful that shoot and root competition, the role of which was estimated by unnatural panel partitions, can be true to nature of competition.
Citation
Yamada, T, "Some Questions on Evaluating the Role of Shoot and Root Competition by Partition Technique" (1985). IGC Proceedings (1985-2023). 85.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/85)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Some Questions on Evaluating the Role of Shoot and Root Competition by Partition Technique
Kyoto Japan
The effects of soil and aerial partitions separating shoot and root competition on plant weight of competing species were compared between the experimental data in six studies previously reported by some authors. Soil partition was found to be mainly operative in five experiments using two grass species so that a winner species can be promoted in growth while a loser species suppressed. In one study, in which a grass-clover combination was used, in contrast, aerial partition was effective in promoting the growth of a winner and in suppressing that of a loser. Corresponding to these effects, in general, plant weights biased positively in a winner species while negatively in a loser species. In case of two grass species combination, the bias were seen to be more marked in both root and full competition, in which no soil partition was used, than in both shoot and no competition with soilpartition. Most of the authors have concluded from these results that root competition played a major role in competition. However, the relative importance of shoot and root competition but aerial and soil partitions what we can find directly as a factor operating in experiments in which each competition is artificially separated. Thus, it is quite doubtful that shoot and root competition, the role of which was estimated by unnatural panel partitions, can be true to nature of competition.
