The 1.0 and 1.5 inch seeding depths on this no-tilled silty clay site resulted in maximum plant populations, but regression equations indicated that the 1.5 inch to 2.0 inch seeding depth resulted in maximum yield when planting in early May of 2013 or early June of 2014.
When torrential rains occurred shortly after planting, the 1.0 inch seeding depth had maximum plant populations on a no-till silty clay soil planted in early May of 2013, and on disk-tilled clay loam soil planted in mid-May of 2014.
The 1.5 inch seeding depth resulted in close to maximum plant populations and yielded more than the 2.0 inch seeding depth (but similar to the 1.0 and 2.5 inch seeding depths) when planting in mid-May in 2013 or early June in 2014 on silt loam soils at this site.
The response function shows asymptotic approach toward a maximum Ym as plant population increases.
Specific yield declines from a maximum value yo as plant population increases, reflecting plant competition for incident solar energy.
Ym (Mg ha−1) for maximum yield at high plant population and c (m2 plant−1) for the population response coefficient.
The spatial pattern of recruitment for the complete study population is centred in the place of maximum lizard visitation, rather than close to the plant population core (i.e. the place with maximum plant density).
In the example, sowing at 100 mm depth compared to 50 mm reduced crop establishment, increased the plant population required to reach the maximum grain yield, reduced the maximum grain yield level itself, and reduced the ability of the crop to suppress weed growth.
For any host H, θ H = r (K H − T), where T is the total plant population, K is the maximum size of the population and r is its rate of growth.
The three studies showed no definitive peak in yield with plant population, but generally exhibited asymptotic approach to maximum yield with increased plant population.
