Text from the report of a lecture from 'The Scottish Farmer' January 18, 1908 on 'what agricultural authorities say in favor of basic slag. Principal R. Patrick Wright, West of Scotland College on the improvement of poor permanent pasture, soil, pure reclaimed moss, formerly covered by poor, brown unnutritious herbage test at labour farm colony, Mid Locharwoods, Dumfrieshshire.' Also notes the cost of manure applied per acre and profit.

Graph illustrating the growth of wheat at Rothamsted over a period of 13 years with increasing amounts of nitrogenous manure from the early/mid 20th century.

Advertisement by the Northumberland County Council Farm, Cockle Park and Durham College of Science, Newcastle-upon-Tyne on the influence of manures on feeding value of tree-field pasture. Soil, poor stiff boulder clay over six seasons (1897-1902) results per acre of a flock of sheep's live weight gain or loss.

Photograph of 'the electric flame which extracts the nitrogen from the atmosphere' for nitrate of lime, the 'best nitrogenous manure in use' in Sweden in the early 20th century.

Image of a table showing the development of the growth of wheat in nitrogen manure at Rothamsted in 1903.

Tables of manure values of various feeding stuffs originally calculated by Messrs. Volecker and Hall and published in the Royal Agricultural Society's Journal in 1902 and rearranged by G C Phillips in 190[7?].

Tables of manure values of various feeding stuffs originally calculated by Messrs. Volecker and Hall and published in the Royal Agricultural Society's Journal in 1902 and rearranged by G C Phillips in 190[7?].

Text and illustration of how a three plot test of nitrogen, phosphate and potash were applied alone and in every combination and one plot with no manure applied can be used by an experimenter with valuable results.