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).

附加文件5：编码本变量及其属性。本文件涵盖了文献筛选、研究纳入排除标准以及数据编码策略的多个维度：1. 文献筛选过程中的排除原因；2. 用于映射的初始编码变量的编码本及下拉选项列表；3. 从检索所得文献中可获取的干预方法的分类类型及子类型；4. 纳入研究类型的定义；5. 国家名录及各相关统计信息（例如：地理区域、在文献数据库中的收录占比、番茄与蔬菜生产统计数据、肥料使用情况、降雨量、灌溉情况及其他经济变量）。