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喀斯特峰丛洼地桂牧一号杂交象草对不同追施氮肥水平的响应

肖润林;单武雄;方宝华;刘小飞;王久荣   

  1. 中国科学院亚热带农业生态研究所, 长沙 410125
  • 收稿日期:2007-06-19 修回日期:1900-01-01 出版日期:2008-05-10 发布日期:2008-05-10

Responses of hybrid Napiergrass “Guimu1” to different topdressing rate of fertilizer N in cluster-peak depression of karst region.

XIAO Run-lin; SHAN Wu-xiong;FANG Bao-hua; LIU Xiao-fei; WANG Jiu-rong   

  1. Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China
  • Received:2007-06-19 Revised:1900-01-01 Online:2008-05-10 Published:2008-05-10

摘要: 利用田间试验,研究了桂牧一号杂交象草对不同氮肥水平的响应。结果表明:3个追施氮肥处理株高、分蘖数、干草产量、粗蛋白含量和可溶性糖含量均高于对照处理;高氮追肥处理株高显著高于对照处理,中氮追肥处理分蘖数和干草产量显著高于对照处理,3个追施氮肥处理粗蛋白和可溶性糖年产量显著高于对照处理;追施氮肥有利于促进桂牧一号杂交象草的生长和营养物质的积累;高氮追肥处理的年净收入低于对照处理;中氮追肥处理为最佳经济施肥量,其年净收入显著高于对照处理。

关键词: 复合型絮凝剂, 絮凝性能, 污水处理, COD, 浊度, 环境安全

Abstract: In a field experiment in karst cluster-peak depression of karst region, this paper studied the responses of hybrid Napiergrass (Pennisetum purpureum) ‘Guimu1’ to different topdressing rate of fertilizer N. The results indicated that under N topdressing, the plant height, tiller number, hay yield, coarse protein content, and watersoluble sugar content of ‘Guimu1’ were higher than CK. The plant height was significantly higher under high N topdressing; the tiller number and hay yield were significantly higher under medium N topdressing; and the coarse protein and water-soluble sugar contents were significantly higher in all N topdressing treatments then CK. N topdressing was beneficial to the plant growth and nutrient accumulation of ‘Guimu1’, but the annual net income of high N topdressing was lower than that of CK. Among the three topdressing rates of N, only medium rate of N topdressing had a significantly higher annual net income than CK.

Key words: Combined flocculants, Flocculent performance, Wastewater treatment, COD, Turbidity, Environmental safety