Ensuring sufficient yield and high-palatability rice cultivated through the direct sowing with recycled-paper mulch in Japan
2008
Okabe, M. | Baba, T., Tokyo Univ. of Agriculture, Tokyo (Japan) | Kamei, M., National Agricultural Research Center for Western Region (Japan) | Yokota, K. | Suyama, K., Tokyo Univ. of Agriculture, Tokyo (Japan)
Direct sowing with recycled-paper mulch has the constraint of an unstable seedling emergence, but has the possibility of substantial labor saving in organic rice cultivation. Direct sowing with recycled-paper mulch was conducted towards overcoming its defects using cultivar Koshihikari. The percentage of emergence was higher than 70%, and that of established hills was lower than 15% because of bird damage after emergence in 2005. In 2006, an early sowing date was effective for recovering the percentage of established hills up to 76% without the use of many strings as barriers against birds. Yield had a 19% reduction as compared with conventional cultivation in 2006. The rice cultivated using paper mulch had low palatability because the protein content was 1% higher than the commonly cultivated rice in 2005, presumably resulting from the excess absorption of nitrogen supplied from the mulch paper. High palatability rice was obtained through the reduction of nitrogen application as a single basal dressing of organic fertilizer. Since the percentage of established hills highly depends on the conditions of each plot, the evaluation of adaptability for direct sowing was required for each paddy field to ensure sufficient yield.
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