Appropriate Planting Density of Two Soybean Cultivars Differing in Adaptability to Dense Planting in Ridge-making Narrow-row Cultivation

Fujita Yoichi, Kawakami Osamu, Kuroda Tomohisa, Hattori Makoto, Higuchi Yasuhiro, Nagumo Yoshifumi, Takahashi Yoshihiko

doi:10.1626/jcs.86.119

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ダイズの耕うん同時畝立て狭畦栽培における適正栽植密度
ダイズの耕うん同時畝立て狭畦栽培における適正栽植密度 : 密植適応性が異なる新潟県ダイズ奨励品種の比較
ダイズノコウウンドウジウネタテキョウアゼサイバイニオケルテキセイサイショクミツド : ミツショクテキオウセイガコトナルニイガタケンダイズショウレイヒンシュノヒカク
―密植適応性が異なる新潟県ダイズ奨励品種の比較―

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Abstract

<p>We evaluated the appropriate planting density in ridge-making narrow-row cultivation of two soybean cultivars “Enrei” and “Ayakogane” in drained paddy fields with heavy clay soil in Niigata prefecture. Two cultivars differed in their adaptability to dense planting cultivation. The relative photosynthetically active radiation (PAR) under the plant canopy with narrow row cultivation decreased with increase in the planting density. The relative PAR at any planting density was less than 10% at the flowering stage, which was sufficient to suppress weed growth. Higher planting density led to more spindly growth at the maturing stage in both cultivars. The lodging index of “Enrei” in narrow row cultivation with the planting density over 17.8 plants m^–2 was higher than that in conventional cultivation with 75 cm interrow space and 8.9 plants m^–2. The lodging index of “Ayakogane” in narrow-row did not differ from that in conventional cultivations. The seed yield of both cultivars tended to increase with increasing planting density. The seed yield of “Enrei” cultivated at a planting density over 17.8 plants m^–2 was significantly higher than that under conventional cultivation. The yield of “Ayakogane” was also increased at a planting density over 13.3 plants m^–2. The appropriate planting density to avoid lodging in ridge-making narrow-row cultivation of “Enrei” was judged to be 8.9–13.3 plants m^–2 to avoid lodging, and that of “Ayakogane” 13.3–26.7 plants m–2 to promote seed yield.</p>

Journal

Japanese Journal of Crop Science

Japanese Journal of Crop Science 86 (2), 119-128, 2017

CROP SCIENCE SOCIETY OF JAPAN

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