MOESM5 of What evidence exists on the effectiveness of the techniques and management approaches used to improve the productivity of field grown tomatoes under conditions of water-, nitrogen- and/or phosphorus-deficit? A systematic map protocol

Additional file 5. Codebook variables and properties. Contains different aspects of the article screening and study eligibility criteria and the data coding strategy: 1. Reasons for exclusion during the screening process; 2. Codebook and drop-down list for initial coded variables considered for mapping; 3. Categorised types and subtypes of intervention approaches likely to find from retrieved literature; 4. Definition of the types of studies accepted; and 5. List of countries and several statistical information related with each country (e.g. geographical region, representation within bibliographical databases, tomato and vegetable production statistics, use of fertiliser, rainfall, irrigation and other economic variables).