Composting of substrates under controlled conditions
2009
Vladeva, D., Institute of Soil Science 'N. Pushkarov', Sofia (Bulgaria) | Petkova, Z., Institute of Soil Science 'N. Pushkarov', Sofia (Bulgaria) | Slavov, D., Institute of Plant Physiology 'Acad. M. Popov', BAS, Sofia (Bulgaria)
As a result of decrease of stock-breeding and significant limited quantity of organic fertilizers there is a need to use new organic sources. Multiple effects of organic fertilizers on soil fertility cannot be replaced from mineral fertilizers. For maintenance the balance of organic matter and preserve the quality of soil it is continued the search of alternative organic fertilizers for fertilizing the soils. Organic wastes used like substrates for composting usually are heterogeneous including complicated complexes of different organic and non-organic substitutes. Requirements for soil, human health preservation and environment limit the introducing of compost which are risky and could pollute the environment. Decomposition of organic materials depends from microbial activity. Each factor which retards or stops growth of microorganisms stops also the process of decomposition. Effective mineralization is running under the conditions of suitable aeration, moisture and the size of particles are small. There are some requirements for content of heavy metals in compost in order to preserve the soils from pollution.
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