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It is forbidden to plow the land during Shemita, as written in Halacha 1.
May one build a fence around his field during Shemita?
It is forbidden to build a fence between two fields. However, it is permitted to build a fence between one’s field and the public.
May one dig a pit in his garden during Shemita for non-agricultural purposes [i.e. plumbing, inserting a pole, Mikveh]?
Yes. All digging for non-agricultural purposes is permitted during Shemita.
 Toras HaShemita 4:24
 See Rambam Shemita Veyovel 1:4; 2:14; Maaseh Rokeiach; Derech Emuna 24; Halichos Hashevi’is 5:15