Paclobutrazol: control of lodging of rice in Japan
1987
Ueno, H. | French, P. | Kohli, A. | Matsuyuki, H. (ICI Japan, Marunouchi Chiyoda-ku, Tokyo (Japan))
Throughout Japan, tall japonica rices - highly susceptible to lodging - are cultivated for their preferred taste. Early lodging can severely reduce yield. Lodging is generally deleterious to grain quality. Field trials were conducted on all major rice varieties on a range of soil types throughout Japan. 'Smarect' granules (0.6% paclobutrazol) were applied to the paddy 10-20 days before heading, a time at which the risk of lodging can be assessed with some accuracy. Rates of 180-240 g ai/ha reduced upper internode length, thus shortening the stem and reducing lodging 'momentum'. Yields were commonly increased by 3-10%, quality losses prevented, and the farmer's quality premium protected. Harvesting was quicker and easier especially with combine harvesters. Following the recommended treatment residues were non-detectable in grain and negligible in straw. Trials now in their third and fourth years show that annual paclobutrazol treatments have no adverse long term effects on rice or other rotational crops. Paclobutrazol is of low mammalian toxicity and safe to fish and the environment.
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