Research press release




Fusuo Zhangたちは論文の中で、中国の小規模農家の農場におけるトウモロコシ、イネ、コムギの栽培の生産性と環境への影響を改善する単純明快な農業介入を紹介している。今回の研究では、この農業介入が1万3000回以上の圃場試験で精緻化された後、従来型農法との比較が行われた。次にZhangたちは、研究者、農業技術者、および農業関連産業従事者(合計約20万人)の連携を作り、キャンペーン、ワークショップ、農場見学を実施して、中国全土の約2100万か所の小規模農家の農場にこの農業介入を広めた。


The productivity and sustainability of smallholder farms can be enhanced by relatively simple farm management techniques, which have been refined in a ten-year study across millions of farms in China, reports a study published onlinein Nature this week.

The largest challenge for sustainable agriculture occurs in regions in which smallholder farming is predominant. Smallholders number around 2.5 billion worldwide and collectively manage around 60% of all arable land, but their farms are often resource-limited and inefficient. In China, for example, there are 200-300 million households, each farming a few hectares, resulting in excessive resource usage. Nitrogen-based fertilizer applications average around 305 kilograms per hectare each year in China, compared with 74 kilograms worldwide, with over-application causing widespread soil acidification, water pollution and greenhouse gas emissions.

Fusuo Zhang and colleagues present straightforward farming interventions that improve both the productivity and environmental impact of maize, rice and wheat cultivation on smallholder farms in China. The interventions were first refined through over 13,000 field trials, and compared with conventional farming practices. The authors then co-ordinated almost 200,000 other researchers, agricultural technicians and agribusiness personnel to run campaigns, workshops and farm visits to spread their techniques to almost 21 million smallholder farms across China.

Although results varied with crops and climate, average yields increased by more than 10% using the new practices, while fertilizer usage dropped by around 15%. Together, overall profits increased by US$12.2 billion. The interventions also reduced nitrogen pollution by 13.3-21.9% and greenhouse gas emissions by 4.6-13.2%.

doi: 10.1038/nature25785

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