@article{oai:ir.kagoshima-u.ac.jp:00011218,
 author = {SUMI, Akio and KATAYAMA, Tadao C.},
 journal = {南太平洋海域調査研究報告=Occasional papers},
 month = {2016-10-31},
 note = {Sorghum and upland rice were made to be grown in pure and mixed stands under
13 liter seedling culture boxes, respectively. The population density was fixed at 24 plants per pot in either treatment.
Soil moisture acted as linear factor and optimum factor on dry matter productions
and leaf area developments of upland rice and sorghum, respectively. The uppermost
limit value of unavailable soil moisture ratio (fo) was higher in upland rice than in sorghum. From these results, it was, in general, concluded that sorghum and upland rice were in possession of the larger drought tolerance and excess-moisture endurance than upland rice and sorghum, respectively. The effect of soil moisture upon leaf area development was expressed comparatively through leaf number in upland rice and through leaf area per one leaf in sorghum. The relative growth rate (RGR) was affected comparatively through leaf area ratio (LAR) in upland rice and net assimilation rate (NAR) in
sorghum. The water use efficiency (WUE) was 3.6 and 8.3 in upland rice and sorghum,
independently of soil moisture conditions excepting that sorghum's WUE fell to 6.4
under an excess-moisture condition.
The relative advantage of mixed-cropping could not be recognized in the present experiment at all. Although fo and optimum soil moisture ratio (fopt) of total in sorghum-upland rice mixture were lower and higher than fo of sole upland rice and fopt of sole sorghum, they were higher and lower than fo of sole sorghum and fopt of sole upland rice, respectively. The basic relationships, as observed in pure stand, between soil moisture ratio, and dry matter productions, leaf area developments and growth functions weren't affected by mixture stand. WUE was also constant in both cropping systems.
Although there were evidences that component crops were competing for a environmental resource in mixed stand, it was expected that it was not a competition for water but
one for light.
From above-mentioned results, it was concluded that sorghum-upland rice mixture
stand should contribute little to the improved stability to soil moisture. If sorghum-upland rice mixture should give the stability and yield advantages under field condition, it seemed to be attributable to the more efficient soil moisture extraction resulting from complementarity of the rooting depth.},
 pages = {210--229},
 title = {Growth Responses of Upland Rice and Sorghum Plants to Soil Moisture in Mixed and Pure Stands},
 volume = {18},
 year = {}
}