What are the main disadvantages of using biochar as a soil fertilizer?
DISADVANTAGES OF BIOCHAR
Although there are many advantages of biochar application in soil, there are some disadvantages as well.
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Article Biochar exerts negative effects on soil fauna across multipl...
Crop yield may decline due to sorption of water and nutrients by the biochar.
Reduced efficacy of pesticides due to sorption by the biochar.
Some biochars are a source of contaminants like heavy metals etc.
For detail Ref to-
https://www.researchgate.net/post/What-are-the-drawbacks-of-biochar
Disadvantage of Biochar in Agriculture
1.) crop yield may decline due to sorption of water and nutrients by the biochar
2) reduced efficacy of pesticides due to sorption by the biochar
3) some biochars are a source of contaminants like heavy metals etc.
4) the fine ash in biochar poses health risk (as dust)
5) the increase in CEC depends on types of soil
Disadvantages of excessive Biochar in fields as fertilizer-
Excessive biochar may decline the worm's growth by reducing respiration. It may adsorb water and agrochemicals reducing water availability to crops and agrochemicals affect weeds and pests. Sometimes biochar may contain heavy metals that produce toxicity to entire flora and fauna and even to the applier. It sometimes may imbalance the pH of fields.
The disadvantages of Biochar are as Follows:
- Biochar can enhance yield of crop on problematic soil (Acidic/ alkaline soil) but it has no or little bit effect on neutral soil.
The fine content of ash has negative impact on soil physical properties by clogging soil pores and thereby soil transport properties. It might have also effect on nutrient balance of soils and has to be applied with a great precaution.
Biochar leads to soil compaction during the application and reduction in worm life rates that enhances organic matter decomposition
Dear Laura Bulgariu . See the following useful link: https://www.uaex.uada.edu/publications/pdf/FSA2196.pdf
Kindly see also the following useful link: http://english.gyig.cas.cn/pu/papers_CJG/201901/P020190128350930049399.pdf
Also check please the following useful link: https://scielo.conicyt.cl/pdf/jsspn/v17n2/aop3717.pdf
The following link is also very useful: Article Benefits and limitations of biochar amendment in agricultura...
Visit kindly the following useful link: Article A scoping review on biochar-based fertilizers: enrichment te...
Biochars have high C that can cause nitrate depression. However, it improves CEC and water holding capacity of the soil.
The drawbacks of biochar implementation:
(i) loss of land due to erosion,
(ii) soil compaction during the application,
(iii) risk of contamination,
(iv) removal of crop residues, and
(vii) reduction in worm life rates.
Biochar is not a fertilzer as plant can not uptake biochar as nutrients. Biochar can help increase soil physco-chemical properties of soil and regular soil nutient avialibility as limit the impact of heavy metals mobiliazation in soil. The main positif effect of biochar is increased C-sequetration to limit GHG emission
If there only one or two negative effects, biochar benefits on Soil property and fertility are numerous.
One of the disadvantages is potential increases in ammonia volatilization from farmland soil.
Hi, In my opinion, biochar not only improve nutrient status of soil but also improve soil structure and microbial activity which are the most significant factors for soil productivity. However, ammonia production may be disadvantage of biochar application to soil in humid environment.
I have used biochar on two vegetable crops (onion?& garlic). I have not observed any visible positive or negative change on crop. It is simply source of research paper buplication. It is good or bad in statistics only. It is a statistical game of research jugglers.
I liked the comments of Nafees Mohammad. Biochar may improve CEC, but not a useful nutrient source.
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