耐密植玉米新品种HM-1化调矮化栽培试验

耐密玉米(Zea mays L.)新品种HM-1经过化调矮化处理,直接导致其玉米干子粒产量显著下降,对其干子粒产量下降的影响力随着其种植密度的加大表现减弱的趋势,但在一定化调施药浓度范围内施药浓度对其产量影响的差异不大。化调矮化能明显降低株高和穗位高,矮化效率与其种植密度关系不大,但随着施药浓度的加大,对其株高和穗位高的矮化效率越大。化调矮化主要通过影响其玉米果穗穗长、穗粗,导致其穗行数和行粒数稍减以及子粒千粒重降低,累计效应导致其单穗粒重明显降低,从而导致其子粒产量明显下降。因没有发生倒伏倒折现象,化调矮化防倒增产的效能没有显现出来,该耐密品种在防灾安全生产上是否适用化调矮化防倒增产这项安全生产技术有待讨论,总之,对其在生产上大面积应用化调矮化这项技术要慎重。

Cultivation Test of Chemical-Regulated-Dwarfing Technology on New High-Density-Tolerant Maize Variety HM-1

Treated with chemical-regulated-dwarfing technology,the new high-density-tolerant maize variety HM-1 showed significant decreasing of dry grain yield. This influence was receding due to increasing in planting density,and independent of drug delivery within a certain dosage. The chemical-regulated-dwarfing technology could significantly reduce the height of maize and its ear position. Though this dwarfing effect was independent of planting density,it would be magnified due to increasing in drug dosage. The chemical-regulated-dwarfing technology could also influence the length and diameter of maize cob. It reduced both number of total row and grain number of each row on a maize cob,and consequently reduced their TKW (Thousand Kernel Weight). All these effects could decrease grain weight per maize cob,and resulted in significant decreasing of grain yield. Because of no maize lodging taking place in the year,the chemical-regulated-dwarfing technology could not display its potential of lodging-resistance and yield increase. So the problem whether this Density-Tolerant maize variety could be used for safety production remained to be discussed. In a word,we should carefully use chemical-regulated-dwarfing technology on this variety for large area production.