In case of field condition, Plant height, number of leaves per plant, number of tuber per plant, weight of tuber per plant, weight of tuber per plot and per hectare, total yield and marketable yield. In case storage condition, amount of starch, vitamin C, and other minerals content, disease index, disease severity etc.
In case field condition, you should record the daily humidity (%), temperature and light intensity. Before conducting experiment, you must analysis the soil nutrient and moisture content.