@article{oai:repository.naro.go.jp:00001532,
 author = {浦上, 敦子 and URAGAMI, Atsuko and 浦嶋, 泰文 and URASHIMA, Yasufumi and 佐藤, 文生 and SATOa, Fumio and 森下, 昌三 and MORISHITA, Masami},
 journal = {中央農業総合研究センター研究報告, Bulletin of the National Agricultural Research Center},
 month = {Mar},
 note = {Carrot (Daucus carota L.) was cultivated in continuous cropping or in combination with radish (Raphanus sativus L.), and/or Taro (Colocasia esculenta Schott) from l997 to 2001. In continuous carrot cropping, spring crop was sown in early April and harvested in late July, then the autumn crop was sown in early August and harvested in early December. In radish-carrot combination, radish was sown in the middle of April and harvested in late June. Then carrot was sown in early August and harvested in early December as in continuous cropping. Taro was sown in early April and harvested in the middle of October only in 2000. In each cropping system, standard amount of chemical fertilizer, half amount of chemical fertilizer, or cow manure substituted for 3/4 of chemical fertilizer plus 1/4 of chemical fertilizer was applied. In radish-carrot cropping system, the yield of carrot in the half amount of chemical fertilizer plot seemed to be as high as the one in the standard in 1999 autumn, 2001 spring and autumn. In other harvests, the yield tended to be lower in the half fertilizer plot. In manure-applied plot, the yield was as high as standard chemical fertilizer plot after 2000. Population density of root lesion nematodes (Pratylenchus penetrans Cobb) was decreased after cultivation of Taro. The population density was kept low even after carrot cultivation in the next spring. Sodium nitrate concentration in soil solution at 60cm deep was measured one to two times a month during cultivation period. Sodium nitrate concentration increased from around 2000 especially in standard chemical fertilizer treatment. Sodium nitrate concentration was lower in the half fertilizer treatment, and much lower in manure-applied treatment than standard treatment.},
 pages = {51--58},
 title = {ニンジンを中心とした作付体系と施肥処理がニンジンの収量、品質、土壌溶液硝酸態窒素濃度およびキタネグサレセンチュウ密度に及ぼす影響},
 volume = {3},
 year = {2003},
 yomi = {ウラガミ, アツコ and ウラシマ, ヤスフミ and サトウ, フミオ and モリシタ, マサミ}
}