Influence of mechanical weeding after rice bran treatment of the soil surface on the growth and yield of paddy-rice cultivated without herbicides
2015
Nakai, J. (Shiga Prefecture Agricultural Technology Promotion Center (Japan)) | Toritsuka, S. | Kawamura, M.
In this study, we examined the effects of mechanical weeding after rice bran application on the growth and yield of paddy rice cultivated without the use of herbicides from 2006 to 2007. In a paddy field and a rotational paddy field after soybean cultivation, the effects of either with or without rice bran application and either with or without mechanical weeding were tested by dividing the experimental field into four blocks. Rice bran application was highly effective in suppressing Lindernia spp., Monochoria vaginalis, Cyperus difformis and Eleocharis acicularis. Mechanical weeding after the application of rice bran not only enhanced weed suppression but also increased nitrogen uptake by the rice plants during panicle formation compared to rice bran application alone. As a result, the number of spikelets per unit area increased, thereby increasing rice yield. In the second year (2006) after soybean cultivation, rice yield increased in a rotational paddy field when compared to a paddy field but yield did not increase in the third year.
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