施钾对高寒区饲用玉米产量与营养品质以及伤流液的影响  

Effect of Potassium Application on Biomass,Nutritional Quality and Bleeding Sap of Forage Maize in Cold Plateau

作　　者：左启华[1,2] 张立峰[1,2] 李会彬[1] 杜雄[1] 边秀举[1] 

机构地区：[1]河北农业大学农学院,河北保定071001 [2]农业部张北农业资源与生态环境重点野外科学观测试验站,河北张家口076450

出　　处：《西北农业学报》2011年第1期65-69,共5页Acta Agriculturae Boreali-occidentalis Sinica

基　　金：中加合作IPNI项目;国家"十一五"科技支撑计划项目(2006BAD15B05);河北省"十一五"科技支撑计划项目(06220901D)

摘　　要：在冀西北高寒区旱砂地条件下,研究钾肥施用量对饲用玉米产量和营养品质形成、根系吸收能力的影响。结果表明,钾肥可显著提高饲用玉米的生物产量,增产5.3%~27.7%;施用钾肥后,粗纤维、粗灰分和全钾含量分别增加了6.9%、18.0%和85.9%,生物累积量分别增加36.1%、50.4%和137.1%;粗蛋白、粗脂肪和全磷含量明显降低,伤流强度、各养分流量和钾离子含量明显提高,其中钾离子流量和含量分别提高240.7%和42.9%,茎基部伤流液中全氮和无机磷含量降低。说明均衡的养分管理是提高饲用玉米产量及肥料效应的关键。A field experiment was conducted to study the effects of potassium application rate on biomass yield,forage quality,and root absorption capacity of forage maize（Zea mays L.） in sand chestnut soil.The results indicated that potassium fertilizer increased forage maize biomass yield by 5.3%-27.7% significantly.Potassium fertilizer depressed crude protein,ether extract and total phosphorus content,meanwhile,which significantly increased content of crude fiber,crude ash and total potassium by 6.9%,18.0% and 85.9%,respectively,and their bio-accumulation increased by 36.1%,50.4% and 137.1%,respectively.Potassium application also accelerated the flow of bleeding sap and all nutrients inclusion and increased content of potassium ion,especially,the flow and content of potassium ion increased by 240.7% and 42.9% respectively,while that decreased concentration of total nitrogen and inorganic phosphorous in bleeding sap.To sum up,balanced nutrient management would be the key to increase biomass and fertilizer effects of forage maize.

关 键 词：饲用玉米 生物产量 钾肥 伤流液 营养品质 

分 类 号：S513[农业科学—作物学] S548