By Hans J. Lugt
Vortex circulate in Nature and expertise is the 1st account of the vortex suggestion and its expanding value in technological know-how and expertise. From aerodynamics and hydraulics to geophysics, philosophy, heritage, and mythology, the publication covers all features of vortex flows and gives a non-mathematical advent to vorticity dynamics. It supplies, particularly, details on vortex laying off, instability, and breakdown and describes many vortex kinds together with wing-tip vortices, airborne dirt and dust cyclones, whirlpools, Gulf-Stream eddies, tornadoes, hurricanes, and galactic spirals.
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Le cas de la Bretagne. In: G. Allard, C. David, J. ), L’agriculture biologique face à son développement. Les enjeux futurs, Editions INRA, France. 289–311 Sandhu HS, Wratten SD, Cullen R (2010) Organic agriculture and ecosystem services. Environ Sci Pol 13:1–7 Sangor S, Abrol IP (2004) Conservation agriculture for transition to sustainable agriculture. Current Science 88:686–687 Sayre L (2011) Des livres anciens aux vieux agriculteurs, in: P. Béguin, B. Dedieu, E. ), Travail en agriculture, Edition l’Harmattan, Paris Schmid O, Padel S, Halberg N, Huber M, Darnhofer I, Micheloni C, Koopmans C, Bügel S, Stopes C, Willer H (2009) Strategic research agenda for organic food and farming, Technology Platform Organics.
Such systems were recently assessed in France in two studies. 1). 5 kg P ha−1year−1. All systems except one received P fertiliser input with frequencies varying from every third year to five years out of six. The average P input at the rotation level varied widely from 0 to 48 kg P ha−1year−1. Alfalfa cutting represented a major removal of P from the field. 1 Rotational P budget of 11 typical stockless organic cropping systems from five French regions (ITAB 2011). 2 year) C 1 alfafa (3 years)/winter wheat/triticale/faba bean/winter wheat/winter barley C 2 alfafa (2 years)/winter wheat/red beet/winter wheat/grain maize/faba bean/winter wheat IDF 1 alfafa (2 years)/winter wheat/triticale/winter oat/faba bean/winter wheat/spring barley/white clover/winter wheat IDF 2 alfafa (3 years)/winter wheat/oilseed rape/winter wheat/faba bean/winter wheat/spring barley IDF 3 faba bean/winter wheat/ grain maize/triticale + peas/ winter wheat PC 1 alfafa (3 years)/winter wheat/grain maize/faba bean/triticale/sunflower/winter barley PC 2 faba bean/winter wheat/winter barley sunflower/winter wheat PDL 1 faba bean/winter wheat/grain maize PDL 2 faba bean/winter wheat/sunflower/winter barley RA 1 alfafa (3 years)/winter wheat/winter wheat RA 2 soybean/winter wheat/grain maize 2 Soil Phosphorus Management in Organic Cropping Systems 35 T.
They showed that available soil P was consistently lower on organic than on conventional farms. , rock phosphate in alkaline soils). Such reports of low P status in organically-managed soils should serve as a warning about potential negative consequences for crop yield. The relationship between crop productivity and soil P status in organic farming systems was recently thoroughly reviewed in Australia (Cornish 2009). It was concluded that many Australian extensive crop farmers experienced a yield reduction with organic farming.