地域別 作物의 適應試驗에 關한 硏究 : 第三報 水稻新品種 維新의 裁培適應試驗 Adaptability of a new rice variety, Yushin in the double cropping paddy fields = A Study on the Adaptability of Economic crops at some regions

다국어 초록 (Multilingual Abstract)

This experiment was conducted to determine the adaptability of Yushin rice variety to Seongju area where rice is mostly planted after barley harvesting. The data obtained in this double cropping paddy fields were compared with those obtained from mono rice culture of various recommended rice varieties which were adopted from the 1976 Annual Report of Gyeongbuk Provincial Office of Rural Development.
As compared with mono rice crop, the late transplanting of Yushin as following crop of barley in paddy fields did not delay heading date, showing that Yushin is late transplanting tolerance. At Yeongil, the coastal area of Gyeongbuk province, early transplanting of recommended rice varieties in mono culture did not markedly hasten heading date than that of Yushin in double cropping paddy fields since low temperature during the early growth stage affected crop growth and thus delayed heading to some extent.
Yield of mono rice culture except for Yeongil area was much higher than that of Yushin in double cropping paddy fields. Lower yield of Yushin at Seongju and Yeongil was mainly caused by the reduction in filled grain percentage, more severe with Yeongil area. There was a significant negative correlation between heading date and filled grain percentage, showing that grain filling is an important indicator mostly affected by delayed heading.
At Seongju, the lower yield of Yushin as compared with Tongil although the higher number of panicle and filled grain percentage were obtained with Yushin might be due to exposure of Yushin crop to contaminated dirty water which comes from the adjoinning villages and due to acute drying at the maturing stage.
Thus, it can be concluded that if Yushin were transplanted within the last recommended transplanting date for Tongil lines, Yushin may exert high yielding capability even in double cropping paddy fields.