Sentences with phrase «soil from organic sources»

Many previous studies have measured concentrations of carbon in the soil from organic sources, and here Papanicolaou et al. contribute new results that account for the uneven slope of the ground, focusing on land that is constantly disturbed by human activities.

Not exact matches

Instead of plowing, farmers leave crop residue on fields after the harvest where it acts as a mulch to protect soil from erosion and a source of organic matter.

Farm - derived renewable resources usually compensate crop export of nutrients but it is sometimes necessary to supplement organic soils with potassium, phosphate, calcium, magnesium and trace elements from external sources.

Soil carbon decomposition, which is temperature sensitive, is a potentially important source of greenhouse gases, which could create a positive feedback to global climate change through the release of greenhouse gases from decomposing organic matter.

The contamination happens if E. coli enters water, either directly from the contaminative source, or indirectly via e.g. soil irrigation with fecally contaminated water or use of organic animal - based fertilizers.

But it is important to appreciate that this risk occurs whether or not a plant protein is certified organic because the sources of the contamination are from the soil, the air and the manufacturing process.

Given the strong positive feedbacks affecting CO2 release from terrestial sources, IT IS EVEN TO BE EXPECTED: tundra (permafrost soil) warms and melts, releasing stored organic matter to the action of fungal and bacterial decomposition which, in turn releases methane and CO2 to the air.

It also has one new sub-category: Changes in mineral soil carbon stocks, which allows for the inclusion of three potential sources of CO2 emissions from agricultural soils (net changes in organic carbon stocks of mineral soil associated with changes in land use and management, emissions from cultivated organic soils and emissions from liming of agricultural soils).