Commentary on fish meal fertilizer consumption amount estimation by Google Gemini

Introduction

Google Gemini did it fine (numbers are correct) but the reference seems wrong. I made some fixations. Check the table below.

The estimation

Table 1. Google-Gemini-estimated Consumption Amounts of fish meal fertilizer in Japan through decades
YearAmounts [tons]Backgrounds
1890200k-250kThe herring fishing industry in Hokkaido was at its peak. Herring meal was sent nationwide.
Source: 農商務統計表　第一次
1910350k-400kDemand is peaking with the expansion of cultivated area.
1936460kThe peak of fish fertilizer production before the war.
Source: 肥料年鑑　昭和12年版
1950150kThe post-war confusion and the start of increased production of chemical fertilizers (ammonium sulfate).
Source: 肥料年鑑　昭和25年版
196780kChemical fertilizers became mainstream, and fish fertilizer was limited to high-grade fruits and tobacco.
Source: 肥料年鑑　昭和45年版
1990-nowadaysLess than few 10kThe majority was converted to "feed (bait)." Fertilizer use sharply decreased.



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