ISPAIDIowa Soil Properties and Interpretations Database
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Crop yield estimates mates from ISPAID for each map unit identified within a field were multiplied by the fraction of the field occupied by that soil.
Morphology of the tax-adjuncts differed only slightly from that for published map units (Steinwand 1992), and yield interpretations were assumed to be equivalent to the corresponding ISPAID values.
We conclude that for areas where ISOIL and ISPAID data are available, field-specific management plans can be developed using these data as a guide for establishing environmentally and economically sound yield goals.