辽宁省不同生态区玉米产量及农艺性状差异研究

以28个玉米品种为试材,在5个密度下对辽宁省4个生态区玉米产量和农艺性状的差异进行研究.结果表明,辽西地区的产量最高,辽北、辽中和辽南地区分别比辽西地区低3.39％、6.06％和19.92％；辽中、辽北和辽南地区植株的株高均较高,辽西地区株高最低；辽南地区的叶面积指数最大,辽北、辽西和辽中地区分别比辽南地区低5.98％、12.64％和18.03％.辽西地区的光照条件突出,中后期群体最大叶面积指数持续时间和光合有效时间均较长,利于构建高密度群体,在肥水充足条件下容易获得高产；辽北地区的光照条件较好,群体最大叶面积指数持续时间和光合有效时间均较长,但灌浆期伴随降水而产生的较低日照时数对产量有一定影响；辽南和辽中地区中后期光照条件较差,使群体最大叶面积指数持续时间和光合有效时间均较短,产量均较低.

Differences of Yield and Agronomy Trait of Maize in Different Ecological Regions of Liaoning Province

The research on differences of yields and agronomy traits of maize in four ecological regions of Liaoning province was performed under five densities using twenty-eight representative maize varieties of Liaoning province as experimental materials. The results showed that the yield of western Liaoning was the highest and northern Liaoning, central Liaoning and southern Liaoning decreased by 3.39%, 6.06% and 19.92% compared with western Liaoning respectively. Plant heights of northern Liaoning, central Liaoning and southern Liaoning were all higher than western Liaoning; leaf index of northern Liaoning, western Liaoning and central Liaoning decreased by 5.98%, 12.64% and 18.03% compared with southern Liaoning respectively. Comparing comprehensively, light condition of western Liaoning was the best, and longer maintenance time of maximum leaf index and effective time of photosynthesis were favorable to construct high-density population which was easy to come to high-yield under the condition of enough fertilizer and irrigation; light condition of northern Liaoning was better, which was favorable to make maintenance time of maximum leaf index and effective time of photosynthesis longer while few sunshine hours caused by large precipitation in the filling stage made certain effect on yield; light condition of southern Liaoning and central Liaoning were both worse, which was favorable to make maintenance time of maximum leaf index and effective time of photosynthesis both shorter and made their yield lower.