Explicación: The term "farm in conversion" gives 35 Google hits. Here is an example of its usage:
"Potatoes, onions, sugarbeet and wheat are the predominant crops, and this unit has a 420 acre farm in conversion for organic production."
19 minutos Nivel de confianza: Coincidencias de otros usuarios (netas) +2
farm in conversion
Explicación: The term "farm in conversion" gives 35 Google hits. Here is an example of its usage:
"Potatoes, onions, sugarbeet and wheat are the predominant crops, and this unit has a 420 acre farm in conversion for organic production."
1 hora Nivel de confianza: Coincidencias de otros usuarios (netas) +1
transitional (organic) farm or (organic) farm in transition
Explicación:
An example from the web: (http://attra.ncat.org/attra-pub/organcert.html)
At this time, producers may not use "organic," "transitional," "transition to organic," or any similar terminology to describe and market production from fields or farms in transition.
There lots of google hits for both variations.
tatyana000 Francia Local time: 22:34 Idioma materno: inglés
The translation workplace 
Coincidencias de otros usuarios (netas) +2