In the last 60 years fertiliser use in agriculture has increased by 900%. However, it’s been reported that up to 80% of these fertilisers are not utilised by crops but are lost to the environment as nitrous oxide, ammonia and nitrate. Improving nitrogen use efficiency is recognised as one possible solution to reducing the sector’s environmental impact and optimising its productivity and sustainability in the face of increasing pressure to feed a growing population. Improving nitrogen use efficiency in crop production reviews recent advances in understanding nitrogen cycling in soil and best practices to assess crop nitrogen status, such as the use of proximal sensors and remote sensing techniques. The book considers developments in the use of inorganic nitrogen fertilisers and their effectiveness in optimising nitrogen use efficiency, as well as how more organic sources of nitrogen, such as livestock manure, can be optimised to achieve the same goal.

This volume constitutes the proceedings of the 11th International Conference on Social Informatics, SocInfo 2019, held in Doha, Qatar, in November 2019. The 17 full and 5 short papers presented in these proceedings were carefully reviewed and selected from 86 submissions. The papers presented in this volume cover a broad range of topics, ranging from the study of socio-technical systems, to computer science methods to analyze complex social processes, as well as social concepts in the design of information systems.

The Collection was begun by the First Duchess of Northumberland in the early eighteenth century; but the greater part of it was made later in the century by Algernon Percy, First Earl of Beverley, during a tour of Europe while in the company of his mentor, Louis Dutens. Their success in France and Italy was such that it incited the jealousy of the Empress Catherine of Russia, herself a passionate collector. The range of objects - cameos, intaglios and finger rings of the highest quality - is considerable: Greek, Roman and Etruscan, as well as a notable assemblage of neoclassical signed gems by British artists. One jewel clearly provided inspiration for Michelangelo's painting of Adam on the Sistine Chapel ceiling. The Collection is little known, except by connoisseurs, but this volume brings to the attention of a broader audience many of the finest products of one of the oldest arts of the western world.

This volume is intended to supply some supplementary information about the gems and cameos published in A Collection of Classical and Eastern Intaglios, Rings and Cameos, published in 2003 as BAR 1136. In particular more information is presented on some of the pot-antique gems in the collection, and on the later gem mounts in which many of the Classical gems are now presented. There are also two more general essays about the reception of Classical gems and techniques in the Renaissance and 17th-19th centuries.

A large catalogue or, as the authors describe it, a 'descriptive handlist' of Greek, Etruscan, Roman, 17th-19th and Near Eastern intaglios, gems and finger rings from a private collection. Each example is chosen for its stylistic importance or for its subject matter and all are accompanied by a photograph.

The creation of miniature intaglios - or incised carvings - which could be impressed on clay or wax was one of the earliest crafts of civilisation. To this the Greeks added relief cameos, while comparable skills were lavished on the decoration of metal finger rings. These artefacts record subjects of significance for their period and place but are also the direct expression of an artist's skills and imagination. Engraved gems were collected first by the ancient Romans and then throughout the Renaissance were a source for knowledge of `classical' subjects and styles, when they were copied - from Michelangelo to Rubens - by the foremost artists of the day. The gemstones explored here are from a distinguished collection made in the earlier twentieth century by a notable connoisseur of ancient art. Many originate from named older European collections and were previously unknown to scholars and collectors. The authors have sought to offer a balanced selection of earlier eastern and Greek stones, alongside others from the neo-classical era. The book offers a survey of the finest products of the gems craft over millennia.