Effect of rice cultivars on the growth of Echinochloa crus-galli (L.) Beauv. var. formosensis in whole-crop silage rice cultivation.

DOI Web Site 27 References
  • Koarai Akira
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Biooriented Research Organization (NARO)
  • Sumiyoshi Tadashi
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Biooriented Research Organization (NARO)
  • Kojima Kiyoshi
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Biooriented Research Organization (NARO) Present address: National Agricultural Research Center, NARO
  • Ohdan Hideki
    National Agricultural Research Center for Kyushu Okinawa Region, National Agriculture and Biooriented Research Organization (NARO)

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Other Title
  • 粗飼料用イネ移植栽培におけるヒメタイヌビエの生育に及ぼすイネ品種の影響
  • ソシリョウヨウ イネ イショク サイバイ ニ オケル ヒメタイヌビエ ノ セイイク ニ オヨボス イネ ヒンシュ ノ エイキョウ

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Abstract

The growth of Echinochloa crus-galli (L.) Beauv. var. formosensis Ohwi was investigated for one- and two-cut whole-crop silage rice cultivation using different rice cultivars in 2001 and 2002. Tetep and Taporuri canopies were always higher than that of E. crus-galli var. formosensis. Thus, the relative photosynthetic photon flux density in rice canopies, calculated as the relative value between photosynthetic photon flux density in the rice canopy and that of the paddy levee surface, quickly decreased during Tetep and Taporuri growth or regrowth periods.<br>There were positive relationships between E. crus-galli var. formosensis shoot dry weight and the relative photosynthetic photon flux density below the canopy at 20cm from the ground at 40 days after transplanting rice or the number of days after transplanting rice when relative photosynthetic photon flux densities were less than 20%. The dry weights of E. crus-galli var. formosensis planted with Tetep and Taporuri were less than those planted with other cultivars in one-cut rice cultivation. In addition, the weed losses of the cultivars themselves were smaller than for other cultivars. The dry weights of E. crus-galli var. formosensis and rice in two-cut rice cultivation were similar to those in one-cut rice cultivation, and those of E. crus-galli var. formosensis were less in two-cut rice cultivation than in one-cut rice cultivation.<br>E. crus-galli var. formosensis contaminated more than 40% of the Hinohikari whole-crop silage, but less than 10% contamination was found in Tetep or Taporuri whole-crop silage.

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