participates_in participates in tillage process land levelling process puddling process disc harrow An implement that consists of many carbon steel or boron discs, which have many varying concavities and disc blade sizes and spacing and which are arranged into two or four sections. It is used to till the soil where crops are to be planted. It is also used to chop up unwanted weeds or crop remainders. bladed harrow disc plough https://orcid.org/0000-0001-6284-4821 land levelling implement puddling implement