砂丘畑栽培ダイズに対する潅水の効果  [in Japanese] Effects of Irrigation on the Growth of Soybean Cultivated in a Sand Dune Field  [in Japanese]

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Abstract

1999, 2000, 2001, 2003年の4年間に砂丘畑(砂丘未熟土)では萎凋・枯死を避ける程度の潅水(節潅水栽培), 普通畑(赤色土壌) では無潅水でダイズを栽培し, 栽培期間の6月~10月の降雨量と子実収量の関係を検討した(実験1). また1999年には, 砂丘畑において慣行の潅水(潅水区)のもとで栽培したものと生育・収量を比較した(実験2). いずれの年においても砂丘畑での収量は普通畑のそれよりも低かったが, 降雨の多かった2001年には普通畑のそれと大差なかった. また, 普通畑ではいずれの年の収量にも大きな差がなかったが, 砂丘畑では栽培期間中の降雨が多い年ほど子実収量が高く, 栽培期間中の降雨量と子実収量との間にr = 0.80(P < 0.20)の正の相関関係があった. 実験2の潅水量の比較では, 節潅水区は潅水区に比べ, 降雨の少なかった7月上旬から8月中旬の乾物生産量が著しく少なかったが, 降雨量が少なくなかった8月中旬以降の乾物増加量には差がなかった. 生育量が小さかった節潅水区は灌水区に比べ, 草丈, 主茎茎径, 分枝数が小さい値になったが, 主茎節数には差がなかった. 節潅水区では, 降雨の少なかった7月上旬から8月中旬の分枝発生数が少なく, 分枝の節数増加も劣った. このため, 節潅水区では分枝の節数が低下して総節数が減少し, さらに結莢率の低下, 不稔莢の増加も加わって稔実莢数が総節数以上に減少した. 一方, 8月下旬以降の降雨量は少なくなかったが, 節灌水区の百粒重は灌水区よりも小さかった. これは, 9月でも3日以上降雨のないことが3回もあり, 継続して土壌に水分が十分保持されなかったことによると考えられた.

In 1999, 2000, 2001 and 2003, soybean plants were cultivated in a sand dune field with minimum irrigation (just enough to prevent wilting) and in a red soil field without irrigation, and the relationship between the yield and precipitation during the cultivation period, from June to October, was examined (Exp.1). The yield in the sand dune field was lower than that in red soil field every year, but in 2001 with a large amount of precipitation, it was similar to that in the red soil field without irrigation. The yield in the red soil field did not vary with the year, but that in the sand dune field highly correlated with the precipitation during the growth period (r = 0.80, P < 0.20). In 1999, the growth and yield of soybean cultivated in the sand dune with minimum irrigation were compared with those under enough irrigation (Exp.2). The dry-matter production of soybean under minimum irrigation was less than that under enough irrigation from mid-July to mid-August when the amount of precipitation was small, but was similar to that under enough irrigation after mid-August when the amount of precipitation was not small. In the sand dune field with minimum irrigation, plant height, diameter of main stem and the number of branches were lower than those under enough irrigation, but the node number of main stem was similar to that under enough irrigation. Under minimum irrigation, the number of branching was low from early July to mid-August when the amount of precipitation was small. In addition, the pod setting rate was low resulting in fewer pod numbers. Although the amount of precipitation was not small after mid-August, the 100-seeds weight in the sand dune field with minimum irrigation was lighter than that in the field with enough irrigation. This is probably because there was no precipitation for three successive days in September, which resulted in deficiency of soil water.

Journal

  • Japanese Journal of Crop Science

    Japanese Journal of Crop Science 74(4), 404-409, 2005-12-05

    The Crop Science Society of Japan

References:  18

Cited by:  1

Codes

  • NII Article ID (NAID)
    110002545782
  • NII NACSIS-CAT ID (NCID)
    AN00189888
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    00111848
  • NDL Article ID
    7761794
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-342
  • Data Source
    CJP  CJPref  NDL  NII-ELS  J-STAGE  JASI 
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