Die Ontogenese von Zea mays L. und ihre Beeinflußbarkeit durch Wachstumsregulatoren

The ontogenesis of Zea mays L. and their modification by plant growth regulators
During a period of 2 years with the maize variety Santos , the effects of the plant growth regulators CCC and RSW 0411 upon vegetative and generative development were tested by pot experiments. The experiments were carried out to optimize the PGR application to maize and to interpret possible PGR effects. The application shah improve the resistance to lodging by a reduction of ear–and plant height as well as by an increase of stalk diameter. At the same time, the sink-capacity of the ear shah increase because this is lucrative to all specializations of corn production.
The PGR RSW strongly reduced the stem elongation during the growing season after an application in ES 21. The basal stem diameter increased highly significant. The PGR CCC did not obviously effect the vegetative development of maize.
RSW suppressed the branching of the tassel after an application in ES 21. Later applications did not disturb the tassel development, because the tassel were completely differentiated at the application time in ES 31/32 and ES 34/35. High application rates of CCC, applied in ES 31/32 and ES 34/35, increased significantly the grain yield by a higher number of kernels per ear. The 1000 kernels weight remained unchanged. The results of the ear ontogenesis indicated, that the PGR CCC lessened the reduction of female spikelets in the ear during the post-silking period.