不同种植模式玉米生长发育和产量形成的研究

为研究不同种植模式玉米生长发育和产量形成的差异,以玉米‘京农科728’为研究对象,设置65 cm均匀垄作(CK)、68 cm均匀行平作(M1)和136 cm大垄双行垄作(M2)3种种植模式,对出苗质量、植株形态、光合生理特性和产量及产量构成因素进行比较分析。结果表明：与对照相比,M2保苗密度显著增加,株距显著缩小且变异系数更低;M2株高、穗位高、叶面积指数和单株干物重分别降低12.61%、11.21%、1.59%和3.67%,群体繁茂程度较低但叶面积指数和单株干物重下降程度均较小;M2净光合速率、气孔导度、胞间二氧化碳浓度和蒸腾速率分别提高了25.24%、25.41%、53.60%和14.82%,功能叶片的光合能力显著增强;2017—2018年M2分别增产12.60%和17.59%,群体收获穗数的显著提高是增产的主要原因。本研究推荐,黑龙江省第一积温带玉米适宜种植模式为136 cm大垄双行（宽行90 cm+窄行46 cm）垄作模式。

Maize Growth and Development and Yield Formation Under Different Planting Patterns

To study the differences of maize growth and yield formation under different planting patterns, the maize variety‘Jingnongke728’was used as material, and three planting patterns were set up, including 65 cm even ridge (CK), 68 cm even tillage (M1) and 136 cm double lines width ridge (M2). The seedling quality, plant morphology, photosynthetic physiological characteristics and yield factors were analyzed. The results showed that, compared with the CK, the seedling density of M2 increased obviously, the plant distance of M2 decreased significantly, and the variation coefficient was lower. The plant height, ear position, leaf area index and dry weight per plant of M2 decreased by 12.61%, 11.21%, 1.59% and 3.67%, respectively, the luxuriant degree was relatively low, but the decreasing extent of leaf area index and dry weight per plant were less. The net photosynthetic rate, stomatal conductance, intercellular carbon dioxide and transpiration rate of M2 increased by 25.24%, 25.41%, 53.60% and 14.82%, respectively, which improved the photosynthetic performance of functional leaf. The yield of M2 also increased by 12.60% and 17.59% in 2017 and 2018, respectively, and the main reason for yield improvement was the increase of ear number of population harvest. This study recommends the suitable cultivation model for maize production in the first accumulative temperature zone of Heilongjiang Province is the 136 cm double lines width ridge (wide line 90 cm+ narrow line 46 cm).