Key Facts
• The Ministry of Agriculture announced the abolition of the ‘Crop Index’ last week.
• The index measures rice yield from 8,000 sample fields, comparing it to a 30-year average.
• Farmers claim discrepancies due to outdated methods, including sieve size differences.
• Official sieves use 1.7 mm openings, while farmers often use 1.9 mm, causing a 15–20% gap.
• Climate change and evolving field conditions have made the index less accurate.
• Farmer Shigenobu Sasaki highlighted the need for precise data on national rice production.
• The Ministry plans to improve yield surveys using AI and revise measurement tools.
Summary
The Japanese Ministry of Agriculture has decided to abolish the ‘Crop Index,’ a statistical tool used to measure rice yields, citing discrepancies between the index and farmers’ experiences. The index, based on data from 8,000 sample fields, has been criticized for outdated methods, such as using smaller sieve sizes than those commonly used by farmers, leading to a 15–20% difference in results. Climate change and evolving agricultural conditions have further reduced its accuracy. Farmer Shigenobu Sasaki emphasized the importance of reliable data for understanding national rice production. Moving forward, the Ministry plans to enhance survey accuracy through AI and update measurement standards.
