energy balance of the soil
21Net energy gain — See also: EROEI Net Energy Gain (NEG) is a concept used in energy economics that refers to the difference between the energy expended to harvest an energy source and the amount of energy gained from that harvest.[1] The net energy gain, which can …
22Mesotrophic soil — Mesotrophic soils are soils with a moderate inherent fertility. An indicator of soil fertility is its base status, which is expressed as a ratio relating the major nutrient cations (calcium, magnesium, potassium and sodium) found there to the… …
23Nitrogen nutrition in the arbuscular mycorrhizal system — Contents 1 Role of nitrogen 1.1 Mechanism of action 1.2 Community and ecology 1.3 Alternate theories …
24Economy of the United States — Economy of United States Rank 1st (nominal) / 1st (PPP) Currency US$ (USD) …
25Eastern span replacement of the San Francisco — San Francisco – Oakland Bay Bridge (eastern span replacement) Artistic rendition of the new eastern span of the Bay Bridge seen from Treasure Island (ca. 2014) Official name To be determ …
26Military history of the United States during World War II — American B 17 Flying Fortresses in flight over Europe …
27MODERN TIMES – FROM THE 1880S TO THE EARLY 21ST CENTURY — introduction effects of anti jewish discrimination in russia pogroms and mass emigration german jewry racism and antisemitism The Economic Crisis of the Early 1930s In Soviet Russia after 1917 new types of social organization contribution to… …
28Threat of the Dnieper reservoirs — The water reservoirs of the Dnieper River in Ukraine pose a significant threat of a large scale human made disaster if their dams fail. Such a threat is typical for reservoir dams; however, the Dnieper reservoirs are especially dangerous because… …
29List of The Dresden Files Organizations — Organizations= The White CouncilThe White Council is the governing body of the Wizard community in the world. They primarily protect humanity from abuses of magic, but also shield this world from the Sidhe and other creatures that wish humanity… …
30Ecology of the North Cascades — Main article: North Cascades The North Cascades are high and rugged with varied conifer species. The Ecology of the North Cascades is heavily influenced by the high elevation and rain shadow effects of the mountain range. The North Cascades is a… …
