How old is the plant? If this is its first year (or first full year), it may be just getting settled. Rhubarb is a heavy feeder (likes composted, organic material) but could it be that you have too much of a good thing? Is there soil mixed in with the chicken pellets? If so, do you know the pH of the soil? If the pH is too low (limey/sour), the rhubarb will not thrive. We wouldn’t add any more fertilizer, certainly not liquid at this time. Remember, too, that its season is late spring, so it is past its prime for this year (being late July) and may be in its natural seasonal decline, in preparation for winter dormancy.
How old is the plant? If this is its first year (or first full year), it may be just getting settled. Rhubarb is a heavy feeder (likes composted, organic material) but could it be that you have too much of a good thing? Is there soil mixed in with the chicken pellets? If so, do you know the pH of the soil? If the pH is too low (limey/sour), the rhubarb will not thrive. We wouldn’t add any more fertilizer, certainly not liquid at this time. Remember, too, that its season is late spring, so it is past its prime for this year (being late July) and may be in its natural seasonal decline, in preparation for winter dormancy.