Abstract:

Through the interaction between planting density and various of growth regulators, the leaf area index, dry matter accumulation per plant, grain filling rate and yield characters of summer maize ‘Zidan11’ were tested and analyzed, the reasonable planting density and the selection and use of growth regulators of summer maize ‘Zidan11’ in central Shandong were discussed. The results showed that the maximum planting density of ‘Zidan11’ was 75000 plants/hm², and the yield would decrease significantly if the density exceeded this. When the density increased without the application of growth regulator, the lodging resistance of ‘Zidan11’ straw would be weakened. The best yield could be obtained by the treatment of 67500 plants/hm² densityand‘amino acid water-soluble fertilizer’. The maturity period with the treatment was delayed and could be used as storage corn ear production, but it should not be harvested too late. The treatment with the density of 75000 plants/hm² and‘30% aminoacyl ester and ethephon’could obtain relatively stable yield with low leaf area index, dry matter accumulation per plant and short maturity period, and had the best anti-falling ability, which was suitable for the grain production of ‘Zidan11’ land intensive mode in the central Shandong Plain.

Key words: planting density, growth regulator, ‘Zidan11’, yield