There is an urgent need to ensure that food production is maintained in response to either a reduction in use or lack of availability of natural resources. To this end, several strategies have been investigated to determine which agronomic approaches may improve crop yields under conditions of reduced water and/or nutrients provision, with special attention upon nitrogen (N) and phosphorus (P). New technologies and practices have been developed for key commercial crops, such as tomatoes. However, few of these are widely adopted in the field and evidence of their value in this production setting is limited. This protocol sets out a systematic map methodology that aims to provide a coherent synthesis of the available evidence among the literature on the techniques and management approaches that may ensure the productivity of field-grown tomatoes under conditions of water-, N- and/or P-deficits, either as single or combined stresses. To conduct the literature search, a search strategy was produced to define the scope of the systematic map and to allow reproducibility of the approach. A list of published and unpublished sources of literature were selected and a preliminary trial identified best-fit-for-purpose search-terms and -strings. A literature screening process was set with consistency checks amongst reviewers at the title, abstract and full text screening stages. A series of eligibility criteria were defined to ensure objectivity and consistency in the selection of studies that are best suited to address the research question of the systematic map. In addition, a coding strategy was designed to set the means for meta-data extraction out from the literature for review. A drafted structured questionnaire will serve as the base for collating the meta-data to produce a database where variables will be queried for the evidence synthesis. This work is expected to inform stakeholders, researchers and policy makers regarding the extent and nature of the existing evidence base, and so serve as a basis by-which specific approaches may be highlighted as potential focal-areas in future.

中文翻译：

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在缺水，缺氮和/或缺磷的条件下，用于提高田间种植番茄产量的技术和管理方法的有效性方面，有哪些证据有效？系统的地图协议

迫切需要确保由于减少自然资源的使用或缺乏自然资源而维持粮食生产。为此，已经研究了几种策略来确定哪种农艺学方法可以在减少水和/或养分的条件下提高作物产量，并特别关注氮（N）和磷（P）。已经针对诸如番茄的主要商业作物开发了新技术和新方法。但是，这些方法很少在该领域中广泛采用，并且在这种生产环境中其价值的证据有限。该协议规定了系统的地图方法，旨在提供文献中有关技术和管理方法的现有证据的连贯综合，这些技术和管理方法可确保在水，氮和/或磷条件下田间种植的西红柿的生产力-赤字，无论是单一压力还是综合压力。为了进行文献检索，产生了一种检索策略，以定义系统图谱的范围并允许该方法的可重复性。选择了已出版和未出版文献的清单，并进行了初步试验，确定了最适合目的的搜索词和字符串。在标题，摘要和全文筛选阶段，通过审查者之间的一致性检查确定了文献筛选过程。定义了一系列资格标准，以确保在选择最适合解决系统图研究问题的研究时具有客观性和一致性。此外，还设计了一种编码策略，以设置从文献中提取元数据以进行审查的方法。起草的结构化问卷将作为整理元数据以生成数据库的基础，在数据库中将查询变量以进行证据综合。预期这项工作将使利益相关者，研究人员和政策制定者了解现有证据基础的范围和性质，并以此作为基础，将来可以重点强调特定方法作为潜在的重点领域。设计了一种编码策略，以设置从文献中提取元数据以进行审查的方法。起草的结构化问卷将作为整理元数据以生成数据库的基础，在数据库中将查询变量以进行证据综合。预期这项工作将使利益相关者，研究人员和政策制定者了解现有证据基础的范围和性质，并以此作为基础，将来可以着重强调特定方法作为潜在的重点领域。设计了一种编码策略，以设置从文献中提取元数据以进行审查的方法。起草的结构化问卷将作为整理元数据以生成数据库的基础，在数据库中将查询变量以进行证据综合。预期这项工作将使利益相关者，研究人员和政策制定者了解现有证据基础的范围和性质，并以此作为基础，将来可以着重强调特定方法作为潜在的重点领域。