How much excess water prevents planting of a crop It's a generic question but was wondering if there is a threshold level of soil water beyond which planting a crop (for e.g. soybean) can be hindered because the soil is too wet or flooded. 

As a background, for a given location, I have the soil water content coming out of a water balance model. In a real world, how much excess soil water compared to field capacity would ideally prevent planting of crops.The reason I am asking is because I am making a model on planting days where a day is classified as 'no planting' given excess water in the soil. 

Please advise.

Thank you.

EDIT

Adding to this, my water model generates soil water content and surface runoff as well
In practice you really don't want to plant a field that is even close to capacity.  Doing so will result in ruts, soil compaction, breakdown of soil structure and a large increase in fuel consumption.

One of the advantages of zero tillage systems is the ability to get out on the field in wetter (earlier in spring) conditions.  All those roots help reduce the sheering between soil particles.