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Furuhata M.,National Agr Research Center Hokuriku Res Cent | Adachi K.,National Agr Research Center Hokuriku Res Cent | Ohono S.,National Agr Research Center Hokuriku Res Cent
Japanese Journal of Crop Science | Year: 2011

We grew soybean using ridge-cultivation in a poorly drained field in the Hokuriku region of Japan for 3 years after drainage-improvement treatment. The soil moisture content of the plow layer in the improved plot was equal to or less than that in a non-treated control plot. Ponding on the plow pan during the rainy season was improved for 1-2 years after the treatment, but not in the third year. Plants grown in the treated field had more pre-flowering branch nodes per plant, heavier dry weight of top, larger leaf area index, higher nitrogen uptake during the seed filling mid-stage of growth and higher root activity after flowering than the control plants. The yield was increased by drainage-improvement treatment in the year of low yield, but not in the three-year average. Source


Furuhata M.,National Agr Research Center Hokuriku Res Cent | Ohsumi A.,National Agr Research Center Hokuriku Res Cent | Chosa T.,Tokyo University of Agriculture and Technology | Matsumura O.,National Agr Research Center Hokuriku Res Cent
Japanese Journal of Crop Science | Year: 2011

The effect of different seed pretreatment, coating materials, and amounts of coating materials on hardness, germination characteristics and color of coated seeds were evaluated to clarify how each factor contributes to protect the seed from bird damage. The coating material of iron-coated seed was more closely adhered to seed than that of peroxide-coated seed making it difficult to flake off, and the iron-coated seed was very hard. The hardness of iron-coated seeds was not due to the thickness of the iron film, but to seed moisture, and was suggested to decrease rapidly along with water absorption by the seed before germination. Decreasing coating ratio of iron material did not affect the color and hardness of the coated seeds but hastened germination. Therefore it is suggested that thinly iron-coated seed germinated early after drainage in the field is prone to be damaged by birds. Source


Furuhata M.,National Agr Research Center Hokuriku Res Cent | Adachi K.,National Agr Research Center Hokuriku Res Cent | Ohono S.,National Agr Research Center Hokuriku Res Cent
Japanese Journal of Crop Science | Year: 2011

In the Hokuriku district of Japan, there are many regions with gley soil that have inadequate drainage, leading to waterlogged conditions and significant plant damage. We grew soybean in ridge-cultivation systems for 3 years in fields with good and poor drainage. Yield was lower in the latter than in the former. The main factor for this outcome may be that soil moisture in the plow layer was higher in the poorly drained field. Plants grown in such a field have less nitrogen uptake, a smaller postflowering leaf area index, reduced post-flowering root activity, reduced increase in dry weight of the top and root, fewer preflowering branch nodes per plant, and less flower buds and ripening pods per plant. Source

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