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河 南省 西部旱 区和郑 州市 农田 上,对 甘薯 进行 水肥 效应 研究 的结 果表 明:不 同氮 磷化肥 配施 能使 鲜薯 和薯 干产 量增 产 252% ~ 430% 和 295% ~4 64% ,单 位 养分 (kg )增 产 鲜薯290 ~ 635kg ;甘 薯对 土壤 的 水分 利 用效 率 可 提高 017~ 102g /(m m .m 2 ), 增 幅为 205% ~731% 。 该区甘薯 的最适 N P 肥比例为 1∶ 05~10,每 公顷施 纯氮和 纯磷( P2 O5 )各 75k g 左右可满足 该区甘薯 生长的 需要。
The results of water and fertilizer effect on sweet potato in the western arid region of Henan Province and farmland in Zhengzhou City showed that the application of different nitrogen and phosphorus fertilizers could increase the yield of fresh potato and sweet potato by 252% -430% and 295% ~ 46.4%, and the unit nutrients (kg) increased the yield of fresh potato by 290 ~ 635kg. The water use efficiency of sweet potato on soil increased by 0.17-1.02 g / (m m · m 2) 20 5% ~ 73 1%. The optimal ratio of sweet potatoes to sweet potatoes in this area is 1: 05 ~ 10, and about 75k g per hectare of pure nitrogen and pure phosphorus (P2 O5) can meet the needs of sweet potato growth in this area.