当前位置:首页>农业>【智慧农业】TARAG:一种面向精准作物病虫害管理的时序感知检索增强生成框架

【智慧农业】TARAG:一种面向精准作物病虫害管理的时序感知检索增强生成框架

  • 2026-05-25 19:08:57
【智慧农业】TARAG:一种面向精准作物病虫害管理的时序感知检索增强生成框架

植物病虫害每年造成大量作物减产,严重威胁全球粮食安全。为降低作物损失,大语言模型(Large Language Models, LLMs)通过充当智能助手,能够为农户提供及时且精准的决策支持,从而缓解精准农业服务获取难的问题。然而,现有研究在精度方面仍存在不足,其主要原因在于忽略了农业生产过程的时间敏感性,通常将领域知识视为与时间无关,未能充分考虑作物物候进程及病虫害发生周期对决策建议的影响。

针对这一问题,本文提出了一种时序感知的检索增强生成框架(Time-Aware Retrieval-Augmented Generation, TARAG),该框架由三个核心模块构成:时序感知知识库构建模块、混合检索模块以及基于时间约束的生成模块,用于提供精准的病虫害防控建议。

首先,时序感知知识库构建模块从非结构化文档中提取信息并构建带有时间标注的知识库,为模型提供补充的农业知识支持;其次,混合检索模块通过粗粒度稀疏检索确保结果的相关性,并结合时间敏感的重排序机制,在语义匹配的基础上进一步实现与用户查询的时间对齐;最后,时序感知生成模块利用检索得到的前k个相关文档及指令提示(instruction prompt),生成最终的决策建议。

为验证所提框架的有效性,本文构建了首个双语、带时间标注的农业问答数据集 TAQA。实验结果表明,与当前主流检索增强生成(RAG)框架相比,TARAG 在检索精度和建议质量方面均显著提升,其检索召回率达到99.14%,生成建议的F1值为66.85%。

本研究所提出的框架及数据集已开源(https://github.com/lee-hash1/agri_rag),为基于大模型的精准农业决策支持提供了新的技术路径。

图1. TARAG与传统检索辅助生成方法的比较分析

图2. TARAG 框架由三个主要模块组成:(1) 时序感知知识库构建(Time-aware knowledge base construction):利用大语言模型(LLM)对外部知识进行结构化处理,并为每条知识条目嵌入对应的病害信息及时间信息;(2) 混合时序检索(Hybrid time retrieval):对原始查询进行处理,首先基于病害信息进行检索,随后通过时间感知重排序机制,从中筛选出时间相关性最高的前 k 个文档;(3) 时序感知答案生成(Time-aware answer generation):将检索得到的上下文信息与原始查询及指令提示相结合,引导大语言模型生成最终具有时间敏感性的响应结果。

图3. TAQA数据集中时间表达类别的分布

图4. 农业问答数据集中,四个时间相关类别中问题和答案的文本长度汇总统计

图5. 混合检索框架的性能评估

文章来源:本文转载自扬州大学智慧农业研究院

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  1. CONNECT:[ UseTime:0.000622s ] mysql:host=127.0.0.1;port=3306;dbname=h_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001011s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000409s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000287s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000724s ]
  6. SELECT * FROM `set` [ RunTime:0.000261s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000736s ]
  8. SELECT * FROM `article` WHERE `id` = 520432 LIMIT 1 [ RunTime:0.000454s ]
  9. UPDATE `article` SET `lasttime` = 1779873045 WHERE `id` = 520432 [ RunTime:0.000917s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000288s ]
  11. SELECT * FROM `article` WHERE `id` < 520432 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000607s ]
  12. SELECT * FROM `article` WHERE `id` > 520432 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000478s ]
  13. SELECT * FROM `article` WHERE `id` < 520432 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000922s ]
  14. SELECT * FROM `article` WHERE `id` < 520432 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001163s ]
  15. SELECT * FROM `article` WHERE `id` < 520432 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001271s ]
0.078131s