Improving soil productivity through biochar amendments to soils.
Improving soil productivity through biochar amendments to soils.
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DOI：
10.5897/ajest08.156
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发表时间：
2009-02
期刊：
影响因子：
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通讯作者：
E. Yeboah;P. Ofori;G. Quansah;E. Dugan;S. Sohi
中科院分区：
文献类型：
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作者：
E. Yeboah;P. Ofori;G. Quansah;E. Dugan;S. Sohi
基于生物炭的土壤管理在热带地区尚未得到充分利用。在温室研究中，两种土壤类型（桑迪和粉壤土）和6个处理，即：3 t ha-1生物炭，120 kg N ha-1，120 kg N ha-1 + 3 t ha-1生物炭，4 t C ha-1牛粪，4 t C ha-1牛粪+3 t ha-1生物炭和对照未改良土壤的土壤生产力进行了评价。处理重复3次。玉米品种“mamaba”是试验作物。在Ayuom的桑迪壤土上，芽干重范围为41至45 g盆-l，在Kwadaso的粉砂壤土上，芽干重范围为28至35 g盆-l。桑迪壤土地上部干重显著高于粉壤土（P < 0.001）。两种土壤的pH值均下降。生物炭在桑迪壤土上的玉米地上部和根系中的氮回收率分别为4%和5%，而在粉壤土上的氮回收率较低。结果表明，生物炭能提高桑迪的氮素利用率，但对粉壤土的氮素利用率影响不大，说明生物炭对土壤生产力的影响存在土壤质地效应。关键词：生物炭，氮素利用率，土壤质地。
Biochar based soil management has not being fully exploited in the tropics. In a greenhouse study, two soil types (sandy loam and silt loam soils) and 6 treatments namely: 3t ha-l Biochar, 120 kg N ha-1, 120 kg N ha-1 + 3t ha-1biochar, 4t C ha-1 cattle manure, 4t C ha-1 cattle manure + 3t ha-1 biochar and control un-amended soil were evaluated for soil productivity. The treatments were replicated 3 times. Maize variety “mamaba” was the test crop. Shoot dry weight ranged from 41 to 45 g pot-l at the sandy loam soil at Ayuom and 28 to 35 g pot-lat the silt loam soil at Kwadaso. Shoot dry weight was significantly (P < 0.001) higher at the sandy loam soil compared to the silt loam soil. Soil pH declined in both soils. Biochar resulted in N recovery of 4 and 5% in maize shoot and root respectively on the sandy loam soil but caused less N recovery at the silt loam soil. The results show that N recovery can be improved by biochar application to sandy loam soil but not silt loam soil suggesting soil textural effect in the effectiveness of biochar application for soil productivity. Key words: Biochar, nitrogen use efficiency, soil texture.