草业学报2018，Vol.27Issue(3)：144-153,10.DOI:10.11686/cyxb2017182
施氮对狼尾草在南方贫瘠旱坡地生长、能源品质及氮肥利用率的影响
Effect of nitrogen fertilizer on the growth, herbage bio-energy yield and nitrogen utilization of Pennisetum glaucum × P.purpureum on arid infertile hill land in South China
摘要
Abstract
To explore the biomass production response of hybrid Pennisetum to nitrogen nutrition in arid hill land in South China,the effects of four different nitrogen (N) application levels (0,112.5,225.0 and 337.5 kg N · ha-1) on morpho-agronomic traits were studied.Parameters measured included yield,SPAD value,bio-energy characteristics and nitrogen utilization efficiency of P.glaucum × P.purpureum (cultivar Guinengcao-1).Application of N fertilizer promoted horizontal plant spread and shoot number,vertical growth,plant height,and stem diameter,but the fresh weight and hay yields were little changed at N fertilizer application rates above 225.0 kg N · ha-1.Application of nitrogen fertilizer also increased the contents of cellulose and hemicellulose,calorific value and the yield of standard coal,while significantly decreasing the contents of dry matter,lignin and ash.The calorific value decreased and the yield of standard coal showed little further increase when the rate of N fertilizer application was raised beyond 337.5 kg N · ha-1,with the result that bio-energy yield of Guinengcao-1 was also decreased.The nitrogen utilization efficiency of Guinengcao-1 did not decrease significantly with increase in N fertilization rate from 112.5 to 225.0 kg N · ha-1,but decreased significantly at 337.5 kg N · ha-1.Therefore,when growing Guinengcao-1 hybrid Pennisetum on arid infertile hill land in South China,N fertilizer is best applied at rates that optimize bio-energy yield.This is achieved when the N application rate is less than 225.0 kg N · ha-1.关键词
旱坡地/狼尾草/施氮量/生物质能源品质/氮肥利用率Key words
arid hillside land/hybrid Pennisetum/nitrogen fertilizer application rate/bio-energy quality/nitrogen utilization efficiency引用本文复制引用
李韦柳,覃维治,熊军,韦民政,唐秀桦,闫海锋..施氮对狼尾草在南方贫瘠旱坡地生长、能源品质及氮肥利用率的影响[J].草业学报,2018,27(3):144-153,10.基金项目
广西科技合作与交流计划项目(桂科合1298014-22),广西农业科学院基本科研业务专项(No.2015YT64)和广西农业科学院基本科研业务专项(桂农科2016YM15)资助. （桂科合1298014-22）
