Abstract
SUMMARYHand-planted plots of across-row-oriented corn seeds (Zeamays L.) produce highly structured leaf canopies and have shown significant yield advantage over randomly planted plots in prior studies. For further investigation of the phenomenon by simulation, the objective of this study was to develop a probabilistic model for the correlation between seed orientation and initial plant orientation. In greenhouse trials, the azimuthal orientation of kernels of four different hybrids was recorded at planting. At collar setting of the seed leaf, the orientation of the seed leaf was determined and the angular data subjected to the analytical methods of circular statistics. The results indicate that the correlation between seed azimuth and seed leaf azimuth can be described by a von Mises distribution. The probabilistic seed to seed leaf azimuth model described herein may be implemented in simulation models to investigate the effect of canopy architecture, canopy closure and light interception efficiency of corn under conditions of seed oriented planting.
Highlights
SUMMA RY Hand-planted plots of across-row-oriented corn seeds (Zeamays L.) produce highly structured leaf canopies and have shown significant yield advantage over randomly planted plots in prior studies
The objective of this research was to identify a probabilistic model for the correlation between seed orientation at planting and the resulting seed leaf azimuth distribution, which could be used in simulations of maize plots planted with oriented seeds
The correlation between seed azimuth and seed leaf azimuth for seeds placed flat in the ground with embryo facing up or down can be described by a von Mises model, defined by a mean direction μ and a concentration parameter κ
Summary
SUMMA RY Hand-planted plots of across-row-oriented corn seeds (Zeamays L.) produce highly structured leaf canopies and have shown significant yield advantage over randomly planted plots in prior studies. Torres et al (2011) examined the effect of seed orientation on leaf azimuth distribution and showed that laying the seed flat, with embryo up or down and caryopsis attachment point across row, produced significantly higher yields than plots planted with randomly oriented seeds. They later concluded (Torres, 2012) that this increase in yield resulted from greater light interception. This model could be enhanced by incorporating a seed leaf azimuth distribution module based on initial seed orientation This add-on module would allow a qualitative investigation of the effect of seed orientation accuracy on canopy development and light interception. The objective of this research was to identify a probabilistic model for the correlation between seed orientation at planting and the resulting seed leaf azimuth distribution, which could be used in simulations of maize plots planted with oriented seeds
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