Variable rate SEEDING
Optimizing Wheat stand density
Variable rate seeding for uniform Winter wheat stand
Crops like wheat, with the ability to tiller, adjust their stand density according to field conditions. In fertile soil, they produce more tillers, while in less fertile soil, tillering may be limited or nonexistent. This natural variability allows us to create an optimal seeding prescription that ensures every seed is used as effectively as possible.
Using satellite-derived productivity potential data, the field was divided into 3 zones, with seed rates tailored to each zone’s growth potential. In stronger zones, the seed rate was reduced to 200 kg/ha to avoid oversowing, while weaker zones received a higher rate of 230 kg/ha to maximize crop density and yield. The John Deere seeder applied the precise seed rates according to the prescription map, ensuring uniform stand across the entire field.
Tillering
Lodging wheat
Disease infested (Puccinia)
By using productivity potential data for the specific field, we can identify stronger and weaker zones based on historical field productivity data from previous years. In the stronger (green) zones, where fertility is higher, we reduce the seeding rate, relying on the wheat’s ability to tiller and form a denser stand naturally. This approach maximizes the use of the field’s full potential while avoiding the issues of overly dense planting, which makes these areas more susceptible to diseases or lodging.
In contrast, in the weaker zones, such as the turning headlands where soil fertility is lower and machinery passes often lead to compaction, we increase the seeding rate. These areas may not perform as well in terms of yield, so boosting the seed rate compensates for lower fertility and the stress caused by frequent turns, ensuring a balanced crop stand throughout the field.
Productivity potential map
Headland turning
Optimized seed rates ensured a uniform crop stand, improved land use efficiency, and reduced seed waste, leading to a more cost-effective and productive seeding strategy.