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Nitrate leaching from a sandy soil: the effect of previous crop and post-harvest soil management in an arable rotation

Published online by Cambridge University Press:  27 March 2009

M. A. Shepherd  and
E. I. Lord
M. A. Shepherd
Affiliation:
ADAS Gleadthorpe, Meden Vale, Mansfield, Nolls NG20 9PF, UK
E. I. Lord
Affiliation:
ADAS Woodthorne, Wergs Rd, Wolverhampton WV6 8TQ, UK
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Summary

Agronomic practices can be modified to decrease autumn soil nitrate and nitrate leaching. This experiment aimed to measure the effectiveness of such practices when integrated into a farming system under UK conditions. The experiment started in autumn 1988 on a sandy soil in Nottinghamshire, UK, and comprised a four-course rotation of potatoes–cereal–sugarbeet–cereal. Three husbandry systems were superimposed, ranging from current commercial practice to most nitrate retentive. Plots were split further to receive either half or full recommended rates of nitrogen (N) fertilizer. Soil mineral N (Nmin) and nitrate leaching (using porous ceramic cups) were measured on selected treatments; this paper presents the findings after five winters.

Autumn Nmin and N leached were strongly influenced by the previous crop, consistently following the order potatoes > cereal > sugarbeet. Pre-harvest management (chiefly N fertilizer input) affected Nmin, and post-harvest management also modified N loss. Cover crops (winter rye or forage rape) after cereals removed 10–40 kg/ha N, depending on previous N management, time and method of establishment. They decreased leaching and were particularly effective if they were able to establish fully before significant drainage occurred. Nmin following sugarbeet, which had received 125 kg/ha N, was less after November lifting than after October lifting (16 and 28 kg/ha N, respectively, as amean of autumns 1989–92). Potatoes left most Nmin (a mean of 60 kg/ha for autumns 1989–92, receiving 220 kg/ha fertilizer N), and their late harvest gave little scope for decreasing leaching losses by establishing green cover before the start of winter. After late harvested root crops (both beet and potatoes), it was often preferable to leave the land fallow over winter, rather than ploughing and drilling a winter cereal.

We show that nitrate leaching can be decreased by simple and inexpensive modifications to an existing crop rotation. Averaged over five winters, adopting such practices decreased the mean N concentration in drainage from 22·3 to 14·5 mg/1.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 127 , Issue 2 , September 1996 , pp. 215 - 229
Copyright
Copyright © Cambridge University Press 1996

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