在稻麦两熟条件下,将2016-2017和2017-2018年江苏扬州参试的24个和江苏睢宁参试的23个小麦品种按氮肥表观利用率(NUR)划分为高效(NUR≥50%)、中效(NUR 40%~50%)和低效(NUR≤40%)品种类型,比较其产量、产量构成因素和群体质量指标的差异...在稻麦两熟条件下,将2016-2017和2017-2018年江苏扬州参试的24个和江苏睢宁参试的23个小麦品种按氮肥表观利用率(NUR)划分为高效(NUR≥50%)、中效(NUR 40%~50%)和低效(NUR≤40%)品种类型,比较其产量、产量构成因素和群体质量指标的差异,为稻茬小麦品种选用和大面积高产高效生产提供参考。结果表明,两年度在扬州均表现出高效的品种为扬麦25和宁麦21,在睢宁为淮麦35。扬州和睢宁氮高效品种产量分别高于6500 kg hm^-2和7000 kg hm^-2,均显著高于其他类型。与氮中效和氮低效品种相比,氮高效品种具有较高的穗数,穗粒数和千粒重品种类型间差异不显著。不同品种间产量和穗数与NUR均呈线性正相关。氮高效品种具有较高的孕穗期和开花期茎蘖数,分蘖成穗率,乳熟期叶面积指数,孕穗期、开花期和成熟期干物质积累量,花后干物质积累量和成熟期各营养器官干物质积累量。不同氮效率品种类型间花前干物质转运量和收获指数差异不显著。相关性分析表明,两地不同品种类型间孕穗期和开花期茎蘖数、乳熟期LAI、主要生育时期干物质积累量、花后和成熟期各营养器官干物质积累量均与氮肥表观利用率呈极显著线性正相关。表明稻茬小麦氮高效品种生育早期表现出较强分蘖能力,且生育后期具有较高叶面积指数和光合生产能力,可用于灌浆的花后同化物质较多。本研究初步提出成熟期干物质积累量16,000~20,000 kg hm^-2和花后干物质积量4100~6700 kg hm^-2可作为稻茬小麦高产高效品种的筛选指标。展开更多
Organic light-emitting devices（OLEDs） with the structure of indium-tin-oxide（ITO）/N,N＇-bis-（1-naphthyl）-N,N＇-diphenyl-（1,1＇-biphenyl）-4,4＇-diamine（NPB）/2,9-dimenthyl-4,7-diphenyl-1,10-phenanthroline（BCP...Organic light-emitting devices（OLEDs） with the structure of indium-tin-oxide（ITO）/N,N＇-bis-（1-naphthyl）-N,N＇-diphenyl-（1,1＇-biphenyl）-4,4＇-diamine（NPB）/2,9-dimenthyl-4,7-diphenyl-1,10-phenanthroline（BCP）/tris（8-hydroxyquinoline）aluminum（Alq3）/Mg：Ag or that of ITO/NPB/1,2,3,4,5,6-hexakis（9,9-diethyl-9H-fluoren-2-yl）benzene（HKEthFLYPh）/Alq3/Mg：Ag were studied.White light emission was achieved with the two devices when the thicknesses of BCP and HKEthFLYPh were 1.5 nm（device B） and 5 nm（device Ⅱ）,respectively.The obvious difference was that the EL spectrum of device Ⅱ was not sensitive to the thickness of HKEthFLYPh compared to that of BCP layer.Moreover,the maximum luminance of device Ⅱ was about 1000 cd/m^2 higher than that of device B at a forward bias of 15 V,and it exhibited a maximum power efficiency of 1.0 lm/W at 5.5 V,which is nearly twice that of device B.The performance of device Ⅱ using a novel star-shaped hexafluorenylbenzene organic material was improved compared with that of BCP.展开更多
文摘在稻麦两熟条件下,将2016-2017和2017-2018年江苏扬州参试的24个和江苏睢宁参试的23个小麦品种按氮肥表观利用率(NUR)划分为高效(NUR≥50%)、中效(NUR 40%~50%)和低效(NUR≤40%)品种类型,比较其产量、产量构成因素和群体质量指标的差异,为稻茬小麦品种选用和大面积高产高效生产提供参考。结果表明,两年度在扬州均表现出高效的品种为扬麦25和宁麦21,在睢宁为淮麦35。扬州和睢宁氮高效品种产量分别高于6500 kg hm^-2和7000 kg hm^-2,均显著高于其他类型。与氮中效和氮低效品种相比,氮高效品种具有较高的穗数,穗粒数和千粒重品种类型间差异不显著。不同品种间产量和穗数与NUR均呈线性正相关。氮高效品种具有较高的孕穗期和开花期茎蘖数,分蘖成穗率,乳熟期叶面积指数,孕穗期、开花期和成熟期干物质积累量,花后干物质积累量和成熟期各营养器官干物质积累量。不同氮效率品种类型间花前干物质转运量和收获指数差异不显著。相关性分析表明,两地不同品种类型间孕穗期和开花期茎蘖数、乳熟期LAI、主要生育时期干物质积累量、花后和成熟期各营养器官干物质积累量均与氮肥表观利用率呈极显著线性正相关。表明稻茬小麦氮高效品种生育早期表现出较强分蘖能力,且生育后期具有较高叶面积指数和光合生产能力,可用于灌浆的花后同化物质较多。本研究初步提出成熟期干物质积累量16,000~20,000 kg hm^-2和花后干物质积量4100~6700 kg hm^-2可作为稻茬小麦高产高效品种的筛选指标。
基金Supported by the National Natural Science Foundation of China(Nos.60425101 and 20674049)Program for New Century Excellent Talents in Universities of China(Nos.060812)Young Talent Project of University of Electronic Science and Technology of China(Nos.060206)
文摘Organic light-emitting devices（OLEDs） with the structure of indium-tin-oxide（ITO）/N,N＇-bis-（1-naphthyl）-N,N＇-diphenyl-（1,1＇-biphenyl）-4,4＇-diamine（NPB）/2,9-dimenthyl-4,7-diphenyl-1,10-phenanthroline（BCP）/tris（8-hydroxyquinoline）aluminum（Alq3）/Mg：Ag or that of ITO/NPB/1,2,3,4,5,6-hexakis（9,9-diethyl-9H-fluoren-2-yl）benzene（HKEthFLYPh）/Alq3/Mg：Ag were studied.White light emission was achieved with the two devices when the thicknesses of BCP and HKEthFLYPh were 1.5 nm（device B） and 5 nm（device Ⅱ）,respectively.The obvious difference was that the EL spectrum of device Ⅱ was not sensitive to the thickness of HKEthFLYPh compared to that of BCP layer.Moreover,the maximum luminance of device Ⅱ was about 1000 cd/m^2 higher than that of device B at a forward bias of 15 V,and it exhibited a maximum power efficiency of 1.0 lm/W at 5.5 V,which is nearly twice that of device B.The performance of device Ⅱ using a novel star-shaped hexafluorenylbenzene organic material was improved compared with that of BCP.
