Download e-book for iPad: Growing Bread on Trees The Case for Perennial Agriculture by Dr. Elaine M. Solowey

By Dr. Elaine M. Solowey

Argument for sustainable agriculture, together with particular ways that people can derive the foodstuff and defend they wish from nature. traditional agriculture has many critical difficulties. within the constructed global, rural parts were broken and depopulated via unwise food-production ideas. The constructing international has suffered significantly from agricultural practices which are unsustainable in terms of topsoil and water. And regardless of our greatest efforts, one fourth of humanity continues to be hungry. Is there a greater approach to feed ourselves? There are actually hundreds and hundreds of vegetation which may simply increase the present agricultural structures of the area, delivering coloration, protect, fertilizer, gas, animal feed, fruit, nuts, oil, medication or even supply us our day-by-day bread. those are vegetation and bushes which are sparing of water, thrifty of assets and beautifully regenerative. the recent cropping platforms of the realm can be in accordance with those perennial crops.

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28 Chapter 2: Carbon Sequestration This is also accomplished by other bacteria, this time by specialized organisms that decompose the nitrogen based compounds which are so vital for life and turn them into free nitrogen again. Unfortunately, besides being overlooked, the nitrogen cycle has also been overloaded. The production and widespread use of nitrogen based fertilizer and NH4 emissions from animal manure are two sources of the surplus nitrogen in the air and water. Even more surplus nitrogen enters the soil as rain washes down the pollution from burning fossil fuels, too much to be used by plants or de-nitrified by decomposing bacteria.

The free living diazotrophs basically fix nitrogen for themselves, usually using a chemical energy source. Photosynthetic diazotrophs use light energy to accomplish the same thing. Associative nitrogen fixing microorganisms are those diazotrophs which live in close association with plant roots, either in the root zone (rhizosphere) or in the plants themselves. These diazotrophs obtain energy from the host plant to fix nitrogen and the host plants benefit from the nitrogen the microorganisms have made available.

In both cases, the host plant supplies the energy to the diazotrophs and the diazotrophs 33 Growing Bread on Trees reduce atmospheric nitrogen to ammonia. This ammonia is then transferred from the bacteria to the plant for the plant's nutritional needs. Nitrogen, in the form of ammonium ions, is also added to the soil from the decay of plants and animals which have benefited from the fixed atmospheric nitrogen in their life cycles. The nitrogen which originates from decomposing animals, plant residues, and also dead micro-organisms, is in essence nitrogen which has already been fixed and is now cycling through the ecosystem.

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Growing Bread on Trees The Case for Perennial Agriculture by Dr. Elaine M. Solowey

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