A comparison of N and P inputs to the soil from fertilizers and manures summarized at farm and catchment scale

P. Domburg*, A. C. Edwards, A. H. Sinclair

*Corresponding author for this work

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Use of fertilizers and manures during 1994 were studied at the farm and catchment scale in the largely agricultural than catchment, north-east Scotland, using farm level census data supplemented by questionnaire data. Grassland accounted for 40% of the agricultural land, and seven farm types represented 87% of the total land, having an average size of 90 ha. The average livestock density of 1.2 livestock units/ha was high compared to Scotland as a whole (0.5). Rates of inorganic fertilizer applied to individual crops in the area corresponded with the national average and current advisory recommendations. At the catchment scale, most fertilizer N was applied to grassland (47%), whereas spring crops received the greatest proportion of the fertilizer P (35%). The annual manure production equated to an average over the catchment of 63 and 16 kg/ha of N and P, respectively. When calculated for farm types these figures ranged from 27 and 6 kg/ha on 'cereal' farms to 384 and 163 kg/ha on 'pig' farms. The ratio of applied fertilizer N and P varied from 4:1 for 'general cropping' to 10:1 for 'cattle and sheep (lowground)' farms. There was no significant compensatory reduction in inorganic fertilizer applications on crops, which also had received manures.

Original languageEnglish
Pages (from-to)147-158
Number of pages12
JournalJournal of Agricultural Science
Volume134
Issue number2
DOIs
Publication statusPrint publication - 1 Mar 2000

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