Conservation agriculture (CA) has been advocated by many scientists as the solution for sustainable agricultural production. Indeed, finding of many research project support it and it can also be seen at Poster Sessions of Tropentag2014, where successful examples were given: applying no-tillage farming had a positive influence for Acrisols in Brazil, mulching application in Kenya provided better water retention or combination of technics increased yields in Mexico. However, a case study from R. Romero-Perezgrovas says, that on 6% of increase in soil fertility on the one hand, farmer would get 50% weeds in his field. (Continue...)

The following international scientific events and conferences have opened their registrations and are calling for paper submissions: The R User Conference 2011 will take place at the University of Warwick , Coventry on 16-18 August 2011. The conference is organized by the Department of Statistics, University of Warwick and supported by the R Foundation for Statistical Computing . Prior to the conference, on Monday 15 August 2011, tutorials will be offered at the conference website . Each tutorial has a length of 3 hours and takes place either in the morning or afternoon. Early registration & abstracts submission deadline: 1st April 2011. Registration deadline: 27th May 2011 The 2011 IASC European conference is organized by the International Association for the Study of the Commons (IASC) . This year’s conference will be hosted by the Agricultural University of Plovdiv , Bulgaria on 14-18 September 2011 under the topic “Shared Resources in a Rapidly Changing World”. Prominent keynote speakers, including Jouni Paavola, Konrad Hagedorn, Marco Janssen, Ruth Meinzen-Dick, Susan Buck and Tine de Moore, have agreed to participate.