Summary
This field-based study addresses food security in mountainous rainfed regions of Yunnan Province by systematically evaluating japonica rice variety adaptability for direct-seeded dryland cultivation and applying Geographic Information System technology to predict production potential. Among 30 tested varieties, only three proved suitable, with the high-quality variety Dianheyou 615 achieving sustainable yields of 7.58 t/ha across demonstration plots in five villages. GIS analysis identified approximately 41,500 hectares of suitable rainfed dryland in Kunming capable of producing sufficient polished rice annually to meet consumption needs for 1.74 million mountain residents, providing a technical foundation for improving food security and reducing poverty in water-scarce mountainous areas.
UK applicability
The direct-seeded rainfed dryland rice cultivation approach may have limited relevance to UK farming systems, which have different climatic conditions, crop portfolios, and established irrigation infrastructure. However, the GIS-based methodology for assessing crop suitability across heterogeneous terrain and identifying geographically appropriate varieties could potentially inform UK upland or marginal land assessment protocols.
Key measures
Grain yield (t/ha), polished rice yield (t/ha), variety suitability classification, suitable cultivation area (hectares), potential annual rice production (tonnes), per capita consumption requirement (kg)
Outcomes reported
The study evaluated adaptability of 30 japonica rice varieties for rainfed dryland cultivation in Yunnan Province and used GIS technology to map suitable cultivation areas and predict production potential. Dianheyou 615 was identified as suitable with an average grain yield of 7.58 t/ha (5.25 t/ha polished rice) across demonstration plots, with GIS analysis identifying 41,500 hectares of suitable rainfed dryland capable of supplying 1.74 million residents annually.
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