施钾对华北高寒区饲用玉米产量与营养品质的影响  

Effects of Potassium on Biomass and Forage Quality of Forage Maize in Cold Plateau of North China

作　　者：左启华[1,2] 李会彬[1] 张立峰[1,2] 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观测试验站,河北张家口076450

出　　处：《玉米科学》2011年第2期119-122,共4页Journal of Maize Sciences

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

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、根系吸收能力的影响。结果表明,施钾肥显著提高了饲用玉米的生物产量,增产5.3%～27.7%;施钾肥降低了粗蛋白、粗脂肪、全磷含量,显著增加了粗纤维、粗灰分和全钾含量,增加幅度分别为6.9%、18.0%和85.9%,3个施钾肥处理生物累积量分别提高36.1%、50.4%和137.1%;施钾肥明显提高了伤流强度、各养分流量和钾离子浓度,其中,钾离子流量和浓度分别提高240.7%和42.9%,降低了茎基部伤流液中全氮和无机磷的浓度。均衡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 in sand chestnut soil.The results indicated that potassium fertilizer increased forage maize biomass yield by 5.3%-27.7%.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%,and the bio-accumulation increased by 36.1%,50.4% and 137.1%.Potassium application also increased the flow of bleeding sap and the all inclusion and content of potassium ion,especially,the flow and content of potassium ion increased by 240.7% and 42.9%,while that decreased concentration of total nitrogen and inorganic phosphorus 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 钾肥 生物产量 营养品质 

分 类 号：S513.062[农业科学—作物学]