Discussion can include how soil temperature influences how long it takes for seeds to sprout.
Make sure to take your readings at the same time every day - air temperature, soil temperature, length of day and percentage of cloud cover. Use the thermometer to measure air and soil temperature. You can use weather information to make your best estimate of the percentage of cloud cover. The relationship between day length and soil temperature and the relationship between air and soil temperatures. Make sure each graph is on a full page, label both the x and y axes and give each graph a title.