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wwswws 发表于 2015-4-21 01:05 
我记得以前查过,好像它本身已经没有太多的肥力了,但是可以改善土壤的呼吸能力,帮助吸收肥料? ...
What are the benefits of using biochar in the garden?
The following benefits occur with additions of biochar
Enhanced plant growth
Suppressed methane emission
Reduced nitrous oxide emission (estimate 50%) (see 5.10 below)
Reduced fertilizer requirement (estimate 10%)
Reduced leaching of nutrients
Stored carbon in a long term stable sink
Reduces soil acidity: raises soil pH (see 5.01 below)
Reduces aluminum toxicity
Increased soil aggregation due to increased fungal hyphae
Improved soil water handling characteristics
Increased soil levels of available Ca, Mg, P, and K
Increased soil microbial respiration
Increased soil microbial biomass
Stimulated symbiotic nitrogen fixation in legumes
Increased arbuscular mycorrhyzal fungi
Increased cation exchange capacity
1.03 How much biochar do I need to apply to achieve these benefits?
This is the subject of ongoing studies. The degree of benefit clearly increases with the application rate. If you are satisfied with a very rough estimate, we would venture that a target application rate of 5 kg/m2 (1 lb/ft2) would be sufficient to achieve these results in most gardens. However, there are substantial benefits related to soil biology at rates well below 1 kg/m2. This FAQ includes information on how to use small amounts of biochar in your garden to best advantage. [peer review requested on target application rate statement]
1.04 How long does it take for these benefits to become apparent? How long do they persist?
Some effects, such as lowering soil acidity, occur immediately. Other effects depend on soil biology and take time to develop. Increased cation exchange capacity will take several years to develop fully. The good news is that these effects are very persistent.
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