不同时期根区局部灌溉对玉米干物质积累和水氮利用的影响  

Effect of Partial Root-zone Irrigation at Different Growth Stages on Dry Mass Accumulation and Water and Nitrogen Use of Maize

作　　者：农梦玲[1] 魏贵玉[1] 李伏生[1] 

机构地区：[1]广西大学农学院,南宁530005

出　　处：《玉米科学》2012年第5期115-120,共6页Journal of Maize Sciences

基　　金：国家"863"计划(2011AA100504);国家自然科学基金(50869001);广西自然科学青年基金(2012GXNSF-BA053047)

摘　　要：通过盆栽试验研究4种氮、钾水平下,不同生育阶段(苗期至抽雄期、苗期至拔节期和拔节期至抽雄期)实施根区局部灌溉对玉米干物质积累、水分利用效率和氮素利用的影响。结果表明,与常规灌溉相比,不同生育期根区局部灌溉处理耗水量均明显减少;苗期至拔节期分根区交替灌溉干物质积累降低甚微或略有增加;中氮、钾(N、K2O均为0.12 g/kg土)时水分利用效率提高22.8%,且氮表观利用率最高。在相同灌水方式下,中氮、钾水平干物质积累、水分利用效率和氮吸收利用较高,中氮、钾时苗期至拔节期分根区交替灌溉是一种节水高效模式。Under four NK levels, the effect of partial root-zone irrigation during the different growth stages on dry mass accumulation, water and N use of maize were studied using a pot experiment. The results showed that compared to conventional irrigation, the partial root-zone irrigation during different growth stages lowered water eonsumption significantly, and alternate partial root-zone irrigation at the seedling to jointing stage lowered or increased dry mass accumulation slightly, and increased water use efficiency by 22.8% and had the highest N apparent recovery fraction at medium NK level （0.12 g N per kg soil and 0.12 g K20 per kg soil）. Under the same irrigation, medium NK level had higher dry mass accumulation, water use efficiency and N uptake of maize. Therefore, ahemate partial root zone irri gation at the seedling to jointing stage of maize is an efficient irrigation method under moderate NK level.

关 键 词：玉米 根区局部灌溉 干物质积累 水分利用效率 氮素吸收与利用 

分 类 号：S513.071[农业科学—作物学]