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Studies on the productivity of grain sorghum sorghum bicolor 3. comparative investigation of the effect of wilting treatments and foliar spray applications of naphthylacetic acid iaa and tryptophan on grain and forage yields of grain sorghum



Studies on the productivity of grain sorghum sorghum bicolor 3. comparative investigation of the effect of wilting treatments and foliar spray applications of naphthylacetic acid iaa and tryptophan on grain and forage yields of grain sorghum



Japanese Journal of Crop Science 49(3): 445-455



To investigate whether increasing growth, grain yield and protein content in droughted plants for a short period was due to increasing auxin content in plant and also to investigate the plant responses under repeated drying of soil during growing season in grain sorghum (Sorghum bicolor (L.) Moench) hybrid H-726, experiments were carried out in the Nagoya University Experimental Farm [Japan] under glasshouse conditions in 1978 and 1979. Although the single short periods of drought and/or single moderate wilting conditions were effective for increasing growth, grain yield and protein content compared with control, the opposite was true with combination of these periods and/or repeated short drought periods and moderate wilting during the growing season. With foliar spray applications of hormones the number of elongated and primordium roots per plant increased more than in control, a decrease was observed when the plants were exposed to X-ray radiation due to degradation of auxin. Because the plant response to the single short periods of drought, single moderate wilting conditions and hormone spray applications of auxin was almost the same, it seems that with a short drought period auxin content increases in plant and causes growth. The plant response to the spray of synthetic hormone (NAA), natural hormone (IAA) and IAA precursor (TTP) was almost the same in this experiment. In culture experiments maximum grain yield was obtained when N concentration in the cultural solution increased from 17.5 ppm to 44 ppm. It seems that increases in grain yield in single drought treatments was due not only to extra hormone, but increasing concentration of N in the soil during the drought period.

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