Effects of the Method of Processing Wheat or Barly Straw in the Double Cropping System on Weed Incidence and Growth of Paddy Rice

Hideshima Yoshitomo, Arima Susumu, Suzuki Akihiro, Makiyama Shigeo, Mori Keisuke, Asakawa Masaaki, Hirota Yuji, Otsuka Norio, Inada Minoru

doi:10.1626/jcs.85.122

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米麦二毛作体系における麦わらの処理方法が水田雑草の発生量と水稲の生育に及ぼす影響
ベイバクニモウサクタイケイニオケルムギワラノショリホウホウガスイデンザッソウノハッセイリョウトスイトウノセイイクニオヨボスエイキョウ

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Abstract

In this study, the effect of plowed-in and incinerated wheat straw on the rice growth and weed incidence were examined in local field trials in Northern Kyushu to determine the most suitable method of processing the straw. The weed incidence was suppressed by plowed-in straw more effectively than by incinerated straw.Plowed-in straw suppressed tillering of rice but improved the ripening after heading of rice, tending to increase the yield. In pot experiments, either plowed-in wheat or barley straw greatly suppressed seed germination of paddy weeds. The weed-suppressing effect of plowed-in straw decreased with time but the effect was observed from the autumn of rice harvest to the heading stage of wheat in the next year. Plowing in all of the wheat straw,20-40 kg/a, had a weed suppressing effect, but plowing in 1/10 of the straw, tended to promote weed growth.Thus,plowing in all of the wheat straw in the paddy field suppressed weed incidence and the effect was retained for a long period.

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Japanese Journal of Crop Science

Japanese Journal of Crop Science 85 (2), 122-129, 2016

CROP SCIENCE SOCIETY OF JAPAN

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