ユウガオへの多量施肥が収量，地下水に及ぼす影響

日本作物学会紀事

高橋 行継¹  吉田 智彦¹  宮﨑 成生² 

[1] 宇都宮大学農学部;栃木県農業大学校

关键词: Bottle gourd;    ユウガオ;    δ15N;    δ15N;    Groundwater;    地下水;    Nitrate nitrogen;    硝酸態窒素;    Nitrogen leaching;    窒素溶脱率;    Upland crop area;    畑作地帯;   

DOI  :  10.1626/jcs.80.96

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We analyzed the quality of the groundwater for irrigation at the Mibu plateau which is the most active region for cultivation of upland crops in Tochigi Prefecture. Our results showed that although the concentration of nitrate nitrogen in the groundwater did not exceed the environmental standard (10 mg L-1), the concentration was higher than that in other areas in Tochigi prefecture. The results obtained from the experiments using the δ15N value method and the land use history suggested that the chemical fertilizer greatly influenced the water quality of the groundwater. In a different experiment, the yield of bottle gourd and the leaching of nitrogen from the soil in the plots that had been treated with standard fertilizer were compared with those in the plots that had been treated with heavy fertilizer. The yield of bottle gourd in the heavy fertilizer-treated plots was 10% higher than that in the standard fertilizer-treated plots. From the viewpoint of cost performance, heavy fertilization had no economic advantage because the increase in income from the high yield was equivalent to the increase in cost for fertilizer. The percentage of leached fertilizer nitrogen was 19.6% in the standard fertilizer-treated plot and 39.6% in the heavy fertilizer-treated plot. Crop cultivation using heavy fertilizer is considered to be the cause of the pollution of groundwater with nitrogen.

【 授权许可】

Unknown