Can I choose different power sources for different irrigation water sources within a crop interval?

Not currently. If there are multiple irrigation water sources within a crop interval, the power source must be the same across all sources. For example, if a field was irrigated with groundwater and surface water, the power source for each must match (e.g. electricity and electricity, or diesel and diesel).

Similarly, if one source used power, the other cannot be left blank (indicating gravity-fed water).