Countermeasure for poor drainage condition in converted paddy field under sunflower-barley cropping system
2010
Inoue, H., National Agricultural Research Center for Western Region, Fukuyama, Hiroshima (Japan) | Hanano, Y. | Narioka, H. | Satou, T.
We provided for a conventional countermeasure to improve poor drainage condition of the paddy fields converted to upland fields through the observations and experiments of the converted paddy fields at Hikawa town in Shimane prefecture in Japan. Hikawa town is located in lowland area nearby Lake Shinji, where sunflowers in summer and barely in winter are cultivated rotationally at about 30ha fields from 2002. In this area, the land consolidation project and the irrigation and drainage project were carried out from 1977 to 1992. Moreover, the farmers conducted the basic countermeasures for the poor drainage condition, for example, the drainage ditches over the fields, the mole drains and so on ; nevertheless, the poor drainage condition can provide only less than 500 kg/ha of the oil-pressing parts from the sunflowers. Therefore, we clarified that the poor drainage condition is mainly caused by the degradation of the underground system through our research. We found that the degradation occurred at the filtering part (rice husk) above the envelope part in the underground system, although a filtering part has an important role in leading water to the drain pipe. Consequently, we refilled the filtering part by using a new rice husk as a conventional countermeasure against the poor drainage condition. As a result, we made a success in growing the sunflowers in around 200cm, even though they were just about 140-150cm in height before the countermeasure. In fact, these kinds of conditions like the poor drainage could be frequently seen; therefore, this type of countermeasure is expected to improve the cultivation in the converted paddy fields as one of effective solution.
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