Here, in field experimentation, a plot having no control of the treatments under study is called control. This is why a control plot is uncontrolled by the treatment. It should be noted that any of the word has either a dictionary meaning or a perfect definition in a particular domain of study.
This is an interesting question. The control plot, to me is the reference plot without expected variation. The control plot represents the reference for the null hypothesis of non variation in among treatment responses in the experiment. These other plots are not controlled but they are allowed to vary with treatments that are applied according to the experimental plan. They represent the alternative hypothesis of possible variation existing among treatment responses. I am not so sure if applying treatments to plots would mean controlling them. I need to be convinced further.
It is a good question for an agronomist whereas a bad question for an statistician. There are two term, absolute controll and controll. When we donot apply any inputs related to the experiments for example we are interested to know the effect of N ferilizers and the abosolute control means with out NPK and control means with out N only. Absolute contol gives you the idea about the plot (field/soil).
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