Acta Agrestia Sinica

›› 2007, Vol. 15 ›› Issue (5): 460-464.DOI: 10.11733/j.issn.1007-0435.2007.05.011

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Study on NPK Fertilizer and Nutrients Utilizing Efficiency under Sudangrass and Ryegrass Rotation Regime in Jianghan Plains

LI Wen-xi1, LU Jian-wei1, LU Jun-ming2, LI Xiao-kun1, JIANG Zhi-ping1   

  1. 1. College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei Province 430070, China
    2. Agricultural Technology Center, Datonghu Administration District of Jingzhou City, Jingzhou, Hubei Province 434300, China
  • Received:2007-03-25 Revised:2007-06-05 Online:2007-10-15 Published:2007-10-15

江汉平原苏丹草-黑麦草轮作中氮磷钾肥效果及养分利用率

李文西1, 鲁剑巍1, 鲁君明2, 李小坤1, 蒋志平1   

  1. 1. 华中农业大学资源与环境学院, 湖北, 武汉, 430070;
    2. 湖北荆州市大同湖管理区农技中心, 湖北, 荆州, 434300
  • 通讯作者: 鲁剑巍,E-mail:lujianwei@mail.hzau.edu.cn
  • 作者简介:李文西(1983- ),男,河南南阳人,硕士研究生,主要研究方向为施肥与生态环境,E-mail:lwc@webmail.hzau.edu.cn
  • 基金资助:
    国际植物营养研究所(IPNI)国际合作项目“江汉平原鱼草平衡施肥技术研究”(Hubei-22)

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Abstract: The NPK combined fertilization and its nutrients utilizing efficiency under Sudangrass-Ryegrass rotation regime were studied by this experiment. The results show that the fresh forage yield of NPK combination treatment increased 123.3 t/hm2, 34.5 t/hm2 and 24.7 t/hm2 more than those of PK, NK and NP treatments, respectively. N, P and K fertilizer evidently improved the yield of fresh forage and dry matter; the increased percentages for fresh grass were 313.1%, 26.9% and 17.9%, and 196.3%, 22.2% 和 9.7% for dry matter, respectively. NPK combination significantly improved N, P2O5 and K2O uptake by forages, and total uptake rates of three elements in two growing seasons were 500 kg N/hm2, 208 kg P2O5/hm2 and 1196 kg K2O/hm2. The uptake ratio of N, P2O5, and K2O for Sudangrass and Ryegrass were 1:0.37:1.96 and 1:0.50:3.19 in presence of NPK combination. In the rotation system, nutrient utilizing efficiency (NUE) of N, P and K were 60.0%, 21.7% and 61.6%, respectively. The contribution rates of N, P and K fertilizer to corresponding nutrients assimilated by forage grass were 81.0%, 32.7% and 23.2%, respectively.

Key words: Sudangrass (Sorghum sudanense (Piper) Stapf), Ryegrass (Lolium multiflorum L.), NPK combination, Nutrient uptake, Nutrient utilizing efficiency, Jianghan plains

摘要： 本试验研究了江汉平原苏丹草-黑麦草轮作制中氮磷钾肥配合施用效果及养分利用率。结果表明:氮磷钾配施(NPK)的饲草鲜草产量分别比不施氮(PK)、不施磷(NK)和不施钾(NP)增产123.3t/hm2、34.5t/hm2和24.7t/hm2;氮、磷和钾肥显著增加鲜草、干草产量,鲜草增产率分别为313.1%、26.9%和17.9%,干草增产率分别为196.3%、22.2%和9.7%;氮磷钾配施显著促进饲草对氮、磷和钾的吸收,3种养分两季吸收总量分别达到500kgN/hm2、208kgP2O5/hm2和1196kgK2O/hm2;氮磷钾配合施用条件下苏丹草和黑麦草的养分吸收比例(N:P2O5:K2O)分别为1:0.37:1.96和1:0.50:3.19;轮作体系中,N、P、K肥利用率分别为60.0%、21.7%和61.6%;氮、磷和钾肥对饲草吸收相应养分的贡献率分别为81.0%、32.7%和23.2%。

关键词: 苏丹草, 黑麦草, 氮磷钾配施, 养分吸收, 养分利用率, 江汉平原

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