【求书】Changes in fertiliser use in the UK from 1950 to 1980.

http://www.cabdirect.org/abstracts/19801957160.html;jsessionid=BEF6BB839596671A65765DB86F9FC189

TitleChanges in fertiliser use in the UK from 1950 to 1980.Authors[color=rgb(61, 76, 82) !important]Cooke, G. W.Book[color=rgb(61, 76, 82) !important]Proceedings, Fertiliser Society 1980 pp. 28pp.Record Number19801957160Abstract

From 1950 to 1978 the total N used in UK increased five times, the K doubled, but P changed little. Prices increased by 5 to 8 times, fertiliser concentrations increased, granulation became universal, liquids secured a small place, and high-nitrogen types dominated the compound market. Recommendations for using fertilisers are much more comprehensive than in 1950. Changes in fertilisers used on the principal arable crops and grassland from 1950 to 1978 are discussed, current use is compared with recommendations. The largest changes are in N: grassland received about a third of the total N used in 1958, but half of the much larger total used 20 years later. In future there are likely to be small increases in the N used on arable crops. Considerable increases in the total quantity of N used on grassland will be justified as more farmers intensify their management. There is little need to increase the total amounts of P and K used but there is scope for improving efficiency by redistributing the supplies so that dressings fit more closely to the needs of farming systems used, and to reserves in the soils.