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Publication Date
1981
Description
Predictions of the supply of soil nitrogen (N) to grass over a growing season requires an assessment of nitrate N plus ammonium N (1) present in the soil at the beginning of the season and (2) likely to be released from the potentially mineralizable organic N during the season. Although a number of methods have been proposed for predicting soil N supply, and in particular the component arising from the potentially mineralizable N, many are too time consuming for routine use, and others have not been proven effective over a range of soils. However, in recent studies, the measurement of nitrate N plus ammonium N, extracted either (1) by boiling with 1M or 2M KC] or (2) by shaking with 0.05M Ba(OH)2, was found to account for 80% of the variation in the yield of Nin the herbage of perennial ryegrass (Lolium perenne L.) grown in pots on 21 soils under uniform environmental conditions. The prediction of soil N supply in the field, at over 18 sites in the UK, was substantially improved when the results of soil analysis were adjusted by a factor, calculated for each site, based on mean values of temperature and soilwater status.
Citation
Whitehead, D C., "Prediction of the Supply of Soil Nitrogen to Grass" (1981). IGC Proceedings (1977-2023). 14.
(URL: https://uknowledge.uky.edu/igc/1981/section3/14)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Prediction of the Supply of Soil Nitrogen to Grass
Predictions of the supply of soil nitrogen (N) to grass over a growing season requires an assessment of nitrate N plus ammonium N (1) present in the soil at the beginning of the season and (2) likely to be released from the potentially mineralizable organic N during the season. Although a number of methods have been proposed for predicting soil N supply, and in particular the component arising from the potentially mineralizable N, many are too time consuming for routine use, and others have not been proven effective over a range of soils. However, in recent studies, the measurement of nitrate N plus ammonium N, extracted either (1) by boiling with 1M or 2M KC] or (2) by shaking with 0.05M Ba(OH)2, was found to account for 80% of the variation in the yield of Nin the herbage of perennial ryegrass (Lolium perenne L.) grown in pots on 21 soils under uniform environmental conditions. The prediction of soil N supply in the field, at over 18 sites in the UK, was substantially improved when the results of soil analysis were adjusted by a factor, calculated for each site, based on mean values of temperature and soilwater status.
