Sir, the service of cutting of paddy/husk straw is exempted vide entry 54 of Notification no. 12/2017-CTR dated 28.06.2017. The relevant extract of the said entry is given below.
Services relating to cultivation of plants and rearing of all life forms of animals, except the rearing of horses, for food, fibre, fuel, raw material or other similar products or agricultural produce by way of-
(a) agricultural operations directly related to production of any agricultural produce including cultivation, harvesting, threshing, plant protection or testing;
(b)....
(c) processes carried out at an agricultural farm including tending, pruning, cutting, harvesting, drying, cleaning, trimming, sun drying, fumigating, curing, sorting, grading, cooling or bulk packaging and such like operations which do not alter the essential characteristics of agricultural produce but make it only marketable for the primary market;