Stabilization and plant uptake of N from 15N-labelled pea residue 16.5 years after incorporation in soil

The decline of N from 15N-labelled mature pea residues was followed in unplanted soil over 16.5 yr. Eight years after residue incorporation, 24% of the residue 15N input was still present in the soil and, after 16.5 yr, 16% of the residue 15N input remained. A double exponential model successfully described the decay of N from 15N-labelled pea residues. The total residual 15N declined with average decay constants of 1.45 yr−1 for the 30 d to 1 yr period and of 0.07 yr−1 for the 1–16 yr period. Sixteen years following incorporation of the residues, indicator plants growing in residues-amended soils were obtaining 1.7% of their N from residue N. This is, to our knowledge, the longest study on decay of N in soils from 15N-labelled crop residues. The current study thus provides a unique data set for our empirical understanding of N-dynamics in agricultural systems, which is a prerequisite to parameterize and validate N-simulation models

Developing Energy Plants for Biofuels Production may Comply to Organic Principles

Biofuels are the only source of renewable environmentally friendly fuel currently suitable for road transport without any negative traits associated with traditional biodiesel or other green energy alternatives. The combustion of petrol and diesel produces many different types of local air pollutants, but the use of biofuels may result in the reductions in emissions of greenhouse gas carbon dioxide up to 70%. Impacts on land use require careful planning to maximise the gains and minimise the losses. The role of biofuels in organic farming will solve three significant problems: 1) waste will become valuable resources; 2) low quality forage products can be utilized for biofuels and thus get value-added; and 3) the trafficable damage on soil fertilities will be reduced by the minimized recirculation rate of bulky watery waste products

A master bosonization duality

We conjecture a new sequence of dualities between Chern-Simons gauge theories simultaneously coupled to fundamental bosons and fermions. These dualities reduce to those proposed by Aharony when the number of bosons or fermions is zero. Our conjecture passes a number of consistency checks. These include the matching of global symmetries and consistency with level/rank duality in massive phases.Comment: 29 pages, 2 figures; v2: minor improvements; v3: typos fixe

No More Liaisons: Collection Management Strategies in Hard Times

Collection development in medium to large academic libraries typically involves multiple subject librarians or “liaisons.” The University of Alaska Fairbanks (UAF) Libraries have lost significant numbers of personnel in the last four years due to attrition and retirements, including most of the professional liaison librarians whose positions will not be replaced in the foreseeable future. In addition to this challenge, collection budgets have been severely reduced due to the State of Alaska's ongoing budget crisis, necessitating large cancellation projects. This article examines UAF Libraries’ collection strategies used to sustain a research-intensive collection without liaisons and with a drastically reduced budget

Data-Driven Decisions for Library Liaisons: Exploring Strategies for Effectively Managing Diminishing Monograph Collections

Many academic libraries have liaison programs as a means of building relevant and useful library collections and to promote library resources to campus users. Librarians have long served as liaisons without the benefit of much data to guide decisions. In this age of library budget cuts, librarians need to make every dollar count. What collection and use data help liaisons build a quality monograph collection that better meets the needs of library users? This article offers some ideas for providing the data needed by liaisons for more informed decision making and collection management and, ultimately, for ensuring that library materials purchased are needed and used.Ye