Effects of biochar and irrigation regime on soil carbon and nitrogen distribution in wheat fields: a two-year field study.
Li Q, Zhao L, Guo S, Tong J, Zhang J
Soil Health
Wheat fields treated with just a shovelful more of biochar per square meter held onto significantly more carbon and nitrogen in the soil — meaning less fertilizer needed next season and a patch of earth that's quietly fighting climate change.
Researchers mixed charred plant material (biochar) into wheat field soil at different amounts, while also testing how much water the crops truly need. They found that a medium dose of biochar — not too little, not too much — combined with slightly less irrigation kept nutrients locked in the soil and actually helped the wheat grow better. The sweet spot was about 10–20 tonnes of biochar per hectare alongside a 10% water cut, which saved water without sacrificing the harvest.
Key Findings
The best-performing treatment (20 t/ha biochar + moderate irrigation) increased soil organic carbon by 23.33% and total nitrogen by 22.46% compared to no-biochar controls.
More than 40% of soil nitrogen concentrated in medium-sized soil aggregates (0.25–2 mm) by the second year, with biochar being the key driver of this distribution.
The optimal strategy — 10–20 t/ha biochar with 4050 m³/ha irrigation (a 10% reduction from full irrigation) — improved wheat grain yield while cutting water use.
chevron_right Technical Summary
Adding biochar to wheat fields at 10–20 tonnes per hectare, combined with a modest 10% reduction in irrigation water, boosted soil carbon and nitrogen storage while maintaining or improving grain yields over two growing seasons in northwestern China.
Abstract Preview
To clarify the responses of soil carbon and nitrogen to biochar amendment under deficit irrigation, a two-year field experiment was conducted in wheat fields of northern Xinjiang with a completely ...
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