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Publication Date
1977
Description
In field experiments it has become clear that at a high level of N fertilization an N reserve can be built up in the soil-plant system which can have a residual effect on the regrowth of a grazed or mown pasture. This residual effect is most apparent when the regrowth is not fertilized with N. In the experiments on clay soil comparisons were made between the amounts of residual N of high-and low-N pretreatments. This was done by calculating the difference between N application and N uptake during the pretreatment period. In the high-N pretreatments this difference was about 80 to ll0 kg N per ha higher than in the low-N pretreatments. In the absence of new fertilizer N the residual effect of that quantity of N was found to be equivalent to 25 to 70 kg N per ha at 5 weeks of regrowth. Assuming no losses by leaching or denitrification, this meant a recovery of about 55 % in July/August, decreasing to about 25 % in September. When fertilizing with N, the residual effect became smaller because it was obscured by the freshly applied N.
Citation
Prins, W H. and Van Burg, P.F J., "The residual effect of fertilizer nitrogen on grassland within one growing season" (1977). IGC Proceedings (1977-2023). 17.
(URL: https://uknowledge.uky.edu/igc/1977/sess7/17)
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The residual effect of fertilizer nitrogen on grassland within one growing season
In field experiments it has become clear that at a high level of N fertilization an N reserve can be built up in the soil-plant system which can have a residual effect on the regrowth of a grazed or mown pasture. This residual effect is most apparent when the regrowth is not fertilized with N. In the experiments on clay soil comparisons were made between the amounts of residual N of high-and low-N pretreatments. This was done by calculating the difference between N application and N uptake during the pretreatment period. In the high-N pretreatments this difference was about 80 to ll0 kg N per ha higher than in the low-N pretreatments. In the absence of new fertilizer N the residual effect of that quantity of N was found to be equivalent to 25 to 70 kg N per ha at 5 weeks of regrowth. Assuming no losses by leaching or denitrification, this meant a recovery of about 55 % in July/August, decreasing to about 25 % in September. When fertilizing with N, the residual effect became smaller because it was obscured by the freshly applied N.
