To help you work out your income from primary production, there is a worksheet (PDF, 49kb)This link will download a file. If you use it, keep the completed worksheet with your other records.
Business and professional items 2015 (NAT 2543) explains where amounts from the worksheet, labelled PP1–PP11, should be shown at P8 on the Business and professional items schedule for individuals 2015 (NAT 2816).