2.3. sampling protocol The Tuber crops Research Centre (TCRC) developed orange- fleshed sweet potatoes for agriculture cultivation. According to the sampling protocol for analysis of nutrients in vegetables and fruits six freshly harvested potatoes of each variety were collected from the cultivation field (TCRc of Bangladesh Agricul- tural Research Institute). After curing for at least one week. 3-4 three samples for each variety potatoes were pooled to make