Choosing the soybean sowing date does not entail costs for the producer and modifies the productive potential and water availability throughout the development cycle. Furthermore, it is a strategy to minimize the risk of loss of productivity due to stress.
The definition of a method that makes it possible to distinguish between these two sources of variation in soybean crop productivity is of great use to producers and consultants, as it makes it possible to define the strategies to be adopted to minimize losses.
Since the 2009/10 harvest, soybean crops have manifested symptoms such as wrinkling of the leaf blade, thickening of veins, blackening of leaves, abortion of flowers and pods, poor grain formation and oversprouting. Among the hypotheses to explain this anomaly is the probable potassium deficiency
When desiccating areas for cultivation, the association of residual herbicides with management herbicides becomes an interesting alternative. Among the products that have a residual effect and that can be associated with glyphosate in the management of weeds that are difficult to control during desiccation, it is possible to list diclosulam, flumioxazin, chlorimuron and imazethapyr
A difficult-to-manage grass, rice grass should also be on the list of concerns in production areas of the main Brazilian oilseed, not only in the soybean-rice rotation, but also in the main producing regions in highlands, with chances of presenting difficulties in control with the glyphosate use
