Publication Date
1985
Location
Kyoto Japan
Description
The seasonal uEtake of fertilizer nitrogen (N) and the annual fertilizer-N balance in cut orchard grass swards were studied by using the field SN-tracer method under humid temperate condition in Japan. 1) Fertilizer-N applied in early spring (for the first cut) and early summer (for the third cut) was readily absorbed by grass, but N applied in autumn (for the fifth cut) was slowly absorbed, the fact is considered to reflect on the efficiency of fertilizer-N. Much more fertilizer-N was recovered in grass (the total of top and root) of the first and third cut than in grass of the fifth cut. Summer depression may have caused the low level of N uptake by grass in autumn. Fertilizer-N uptake rate during early stage of regrowth and the recovery of fertilizer-N in each cut were lower in the second harvest year than those of the first harvest year after the establishment. 2) Annual recoveries of fertilizer-N in swards at different ages were in the ranges 50-37 % in cut herbage, 8-9 % in stubble, 1-3 % in litter, 5-7 % in root and 23-24 % in soil (0-50 cm depth). The recovery in cut herbage was lower in the swards of older ages. In the whole grass (the total of cut herbage, stubble, litter and root), the recovery of fertilizer-N was 66 % in the first year sward, but decreased to 58-55 % in the second, third and 10th year swards. The total recovery of fertilizer-N (including the recovery from soil) was 90 % in the first year sward and 81-78 % in the second to 10th year swards. The loss of fertilizer-N was 10 % in the first harvest year and about 20 % in the subsequent years.
Citation
Kimura, T and Kurashima, K, "The Fate of Fertilizer Nitrogen Applied to Grass Sward in Japan- Influence of Sward Age and Season of the Year" (1985). IGC Proceedings (1985-2023). 2.
(URL: https://uknowledge.uky.edu/igc/1985/ses6/2)
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
The Fate of Fertilizer Nitrogen Applied to Grass Sward in Japan- Influence of Sward Age and Season of the Year
Kyoto Japan
The seasonal uEtake of fertilizer nitrogen (N) and the annual fertilizer-N balance in cut orchard grass swards were studied by using the field SN-tracer method under humid temperate condition in Japan. 1) Fertilizer-N applied in early spring (for the first cut) and early summer (for the third cut) was readily absorbed by grass, but N applied in autumn (for the fifth cut) was slowly absorbed, the fact is considered to reflect on the efficiency of fertilizer-N. Much more fertilizer-N was recovered in grass (the total of top and root) of the first and third cut than in grass of the fifth cut. Summer depression may have caused the low level of N uptake by grass in autumn. Fertilizer-N uptake rate during early stage of regrowth and the recovery of fertilizer-N in each cut were lower in the second harvest year than those of the first harvest year after the establishment. 2) Annual recoveries of fertilizer-N in swards at different ages were in the ranges 50-37 % in cut herbage, 8-9 % in stubble, 1-3 % in litter, 5-7 % in root and 23-24 % in soil (0-50 cm depth). The recovery in cut herbage was lower in the swards of older ages. In the whole grass (the total of cut herbage, stubble, litter and root), the recovery of fertilizer-N was 66 % in the first year sward, but decreased to 58-55 % in the second, third and 10th year swards. The total recovery of fertilizer-N (including the recovery from soil) was 90 % in the first year sward and 81-78 % in the second to 10th year swards. The loss of fertilizer-N was 10 % in the first harvest year and about 20 % in the subsequent years.
