Adjusting sowing density given soil structure improves seed yield and yield per hectare. It is appropriate to sow the seeds more densely with a better-quality soil, which provides a larger capacity of moisture (evapotranspiration is slower) and nutrient retention, than with lower-quality soil. If a lower density of sowing is applied to a lower-quality soil, the crop quality equals the one applied to better-quality soil – the latter results in plants having a larger area available for nutrient and moisture extraction from the soil.
For example: on one part of the parcel there is a greater amount of clay soil (a greater ability of moisture retention) and on the other a greater amount of sandy soil (a lower ability of moisture retention). In the case of normal seed density on the part with a greater amount of clay soil and smaller density on sandy soil, the same amount of field crop can be achieved. In the dry period, plants fight for moisture and nutrients on more sandy soil, which results in lower plant quality and less crop. Contrarily, in the case of infrequent sowing density, the plants on the same field area have a greater area at their disposal to extract moisture and nutrients for growth.