【摘要】 以2011年审定的小麦品种普冰9946为试材,研究5种施肥水平和4种播种密度对其叶片SPAD值和产量的影响。结果表明,在不同施肥和密度处理下,小麦起身期和开花期SPAD值呈显著差异,拔节期和灌浆期SPAD值呈极显著差异;处理(密度315×104 hm-2,N 225kg/hm2,P 150kg/hm2,K 150kg/hm2)和(密度315×104 hm-2,N 300kg/hm2,P 200kg/hm2,K 200kg/hm2)在各个时期顶叶(旗叶)均有较大SPAD值。当密度为315×104 hm-2,施肥量为N 225kg/hm2,P 150kg/hm2,K 150kg/hm2时,穗粒数和产量均为最大,分别为每穗44.92粒和9 873.00kg/hm2,并具有较高的有效穗数和千粒质量。不同时期顶叶(旗叶)SPAD值与有效穗数、穗粒数和产量存在正相关关系,与千粒质量存在负相关关系;小麦顶叶(旗叶)SPAD值对有效穗数、穗粒数和产量的影响主要从拔节期开始,且主要在拔节期与开花期。可见,适当增加播种密度和施肥量,可使冬小麦在整个生育期获得相对稳定且较高的SPAD值,并可显著增加冬小麦的穗粒数和产量。更多还原

【Abstract】 Pubing 9946,was used to study the effects on SPAD and grain yield with five fertilizer levels and four planting densities.The result showed that under treatments with different planting density and fertilization,SPAD at standing stage and at flowering stage were different,and SPAD at jointing stage and at filling stage were significant different.In the treatment combinations of density 315× 10 4 hm-2 + N 225kg / hm 2 + P 150kg / hm 2 + K 150kg / hm 2 and density 315×10 4 hm-2 + N 300 kg / hm 2 +P 200kg / hm 2 + K 200kg / hm 2,the winter wheat could have high SPAD among different growth stages.In the treatment of density 315×10 4 hm-2 +N 225kg / hm 2 +P 150kg / hm 2 +K 150 kg / hm 2,the winter wheat could have the highest spikelet number(44.92grains per panicle) and yield(9 873.00kg / hm 2),which also had higher thousand kernel mass and the number of ear bearing tiller.There were significant positive correlations between SPAD and effective panicle,kernels per spike and yield but inverse correlation between SPAD and thousand kernel mass.The effect of SPAD of wheat on effective panicle,kernels per spike and yield had begun since jointing stage,especially at jointing stage and flowering stage.Therefore,with a suitable increase of fertilization quantity and planting density,the winter wheat could have a relatively steady and high SPAD during the whole life,and the spikelet number and yield also increased significantly.更多还原