Untitled
同じ作物を同じ畑で作り続けると、できが悪くなる。そこでヨーロッパではいわゆる三圃制を、｢冬作小麦地｣｢夏作大麦地｣｢牧草地｣｢休閑地｣のローテーションで土地を使い回していくやり方をとった。この方法ではローテーションの中に牧草地、休閑地＝家畜の放牧が必要で、家畜の糞尿が自然に麦わらと堆肥化して、窒素を固定化し、肥沃な土地を再生して行くやり方だった。
　エジプトのナイル川では、これを一気に夏の洪水にまかせていた訳だけど、水田は単一作物の栽培による「毒」の蓄積と栄養の枯渇化を、水の流れによって流し補った訳で、いわばナイル川の洪水を、ものすごく穏やかにし、日常化しているので、｢牧草地｣｢休閑地｣を取り入れなくても、家畜を取り入れなくても、毎年、同じ田んぼから同じように米が収穫できるのである。
“
— 寿司は江戸前の理由／江戸っ子の肥料事情と海洋資源のリサイクル 読書猿Classic: between / beyond readers (via ginzuna) (via tuvuan) (via takaakik) (via otsune)

すごい！
Reblogged 2 years ago from otsune (Originally from ginzuna)
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