Summary
Inputs and outputs to the N balance of a clay soil catchment (Evesham and Kingston series) under grassland and cereals at Wytham near Oxford were measured over 2 years. Soil mineral N (NH4+NO3) was measured to 1 m depth at intervals of 2 to 8 weeks. The frequency distribution of these values was approximately log-normal and the geometric mean was used as an estimate of central tendency. Overall, soil mineral N tended to decrease during the study period, but marked fluctuations were observed in autumn (October–November) and early spring (February–March) in the grassland due to mineralization of soil organic N, and in the arable soil in April–May following the application of N fertilizer to the spring barley and winter wheat.
N lost by leaching, including a little surface runoff, was calculated from the NO3 concentration of the catchment drainage and the volume of drainage. The estimate of N leached using concentrations unweighted for flow rate was only 14 per cent less than that based on flow-weighted concentrations. The differences in the uptake of N by cereals and grass between fields were explicable partly in terms of soil type and partly in terms of the timing and amounts of fertilizer added. The results are discussed in the context of steady-state equilibrium of N in the soil-plant system. However, an N balance could not be struck because N input due to mineralization, and N outputs due to gaseous losses and immobilization of N in the soil and root biomasses, were not measured and could not be accurately estimated.
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References
Bliss C I 1967 Statistics in Biology, Vol. 1. McGraw-Hill, pp 558.
Bremner J M 1965 Inorganic forms of nitrogen.In Methods of Soil Analysis. Ed. C A Black, Am. Soc. Agron., Monog. No.9, Madison, Wisconsin, pp 1179–1237.
Bremner J M 1965 Total nitrogen.In Methods of Soil Analysis. Ed. C A Black, Am. Soc. Agron., Monog. No. 9, Madison, Wisconsin, pp 1149–1178.
Craswell E T and Martin A E 1975 Isotopic studies of the nitrogen balance in a cracking clay. I Recovery of added nitrogen from soil and wheat in the glasshouse and gas lysimeter. Aust. J. Soil Res. 13, 43–52.
Crooke W M and Simpson W F 1971 Determination of ammonium in kjeldahl digests of crops by an automated procedure. J. Sci. Fd. Ag. 22, 9–10.
Fried M, Tanji K K and Pol R M Van de 1976 Simplified long term concept for evaluating leaching of nitrogen from agricultural land. J. Environ. Qual. 5, 197–200.
Legg J O and Meisinger J J 1982 Soil nitrogen budgets.In Nitrogen in Agricultural Soils Eds. F J Stevenson. Am. Soc. Agron., Monog. No 22, Madison, Wisconsin, pp 503–566.
Litchfield M H 1967 The automated analysis of nitrite and nitrate in blood. Analyst 92, 132–136.
Martin R P and White R E 1982 Automatic sampling of stream water during storm events in small remote catchments. Earth Surface Processes and Landforms 7, 53–61.
Tomlinson T E 1971 Nutrien losses from agricultural land. Outlook Agric. 6, 272–278.
Warrick A W and Nielsen D R 1980 Spatial variability of soil physical properties in the field.In Applications of Soil Physics. Ed. D Hillel. Academic Press, New York, pp 314–344.
White R E, Wellings S R and Bell J P 1983 Seasonal variations in nitrate leaching in structured clay soils under mixed land use. Agric. Water Mgt (In press).
Wild A and Cameron K C 1980 Soil nitrogen and nitrate leaching.In Soils and Agriculture. Ed. P B Tinker. Soc. Chem. Ind., Critical Reports on Applied Chemistry, Vol. 2, Oxford, Blackwell Scientific Publications, pp 35–70.
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Macduff, J.H., White, R.E. Components of the nitrogen cycle measured for cropped and grassland soil-plant systems. Plant Soil 76, 35–47 (1984). https://doi.org/10.1007/BF02205565
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DOI: https://doi.org/10.1007/BF02205565