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首页> 外文期刊>Australian Journal of Soil Research >Effect of banded biochar on dryland wheat production and fertiliser use in south-western Australia: an agronomic and economic perspective
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Effect of banded biochar on dryland wheat production and fertiliser use in south-western Australia: an agronomic and economic perspective

机译：带状生物炭对澳大利亚西南部旱地小麦生产和肥料使用的影响：农艺和经济角度

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摘要

Effects of banded biochar application on dryland wheat production and fertiliser use in 4 experiments in Western Australia and South Australia suggest that biochar has the potential to reduce fertiliser requirement while crop productivity is maintained, and biochar additions can increase crop yields at lower rates of fertiliser use. Banding was used to minimise wind erosion risk and place biochar close to crop roots. The biochars/metallurgical chars used in this study were made at relatively high temperatures from woody materials, forming stable, low-nutrient chars. The results suggest that a low biochar application rate (~1t/ha) by banding may provide significant positive effects on yield and fertiliser requirement. Benefits are likely to result from improved crop nutrient and water uptake and crop water supply from increased arbuscular mycorrhizal fungal colonisation during dry seasons and in low P soils, rather than through direct nutrient or water supply from biochars. Financial analysis using farm cash flow over 12 years suggests that a break-even total cost of initial biochar use can range from AU$40 to 190/ha if the benefits decline linearly to nil over 12 years, taking into account a P fertiliser saving of 50% or a yield increase of 10%, or both, assuming long-term soil fertility is not compromised. Accreditation of biochar for carbon trading may assist cost reduction.
机译：西澳大利亚州和南澳大利亚州的4个试验中，生物炭有条带化施用对旱地小麦生产和肥料的影响表明，生物炭有潜力在保持作物生产力的同时降低肥料需求，而生物炭的添加可以降低肥料的使用率来增加作物产量。使用捆扎带将风蚀风险降到最低，并将生物炭放置在靠近作物根部的地方。本研究中使用的生物炭/冶金炭是在较高温度下由木质材料制成的，形成稳定的低营养炭。结果表明，通过绑扎方式施用低生物炭（〜1t / ha）可能对产量和肥料需求产生明显的积极影响。干旱季节和低磷土壤中丛枝菌根真菌定殖的增加可能会改善作物的养分和水分吸收以及作物的供水，而不是直接从生物炭中提供养分或水分，从而带来好处。使用过去12年的农场现金流进行的财务分析表明，如果收益在12年内线性下降至零，则最初使用生物炭的收支平衡总成本范围为AU $ 40至190 / ha / ha，考虑到P肥料节省了50假设长期的土壤肥力没有受到影响，则百分比或单产提高10％或两者兼而有之。认可用于碳交易的生物炭可以帮助降低成本。

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