Fate of Fertilizer Nitrogen Applied in an Area with High Precipitation in Southern Kyushu

Japan Agricultural Research Quarterly
ISSN 00213551
NII recode ID (NCID) AA0068709X
Full text

Contamination of shallow groundwater by nitrogen, which has been of great concern recently in Southern Kyusyu, a region with high precipitation, is mainly considered to be brought about by the return of a large amount of livestock waste to arable land. As s result, the fate of excess nitrogen applied to arable land is now being monitored to solve this problem. The results obtained in this study were as follows: 1) The amount of eluviated N ranged from 4 to 28 kg/10 a for the year examined, with a negative correlation between precipitation and crop yields. 2) Eluviation of N in regions with high precipitation was mainly dependent on precipitation factors and involvement of soil factors was limited to low precipitation years. 3) When the amount of applied slurry barnyard manure increased, the rate of N lost (due to volatilization and denitrification) increased. The N concentrations in the soil solutions collected from the plots where a large amount of slurry barnyard manure had been applied decreased with time. In addition, a high concentration of nitrous oxide remained in the subsoils. It was suggested that microbial decontamination of excess N occurred in soil.

Date of issued
Creator Yoshiyuki KOBAYASHI Hiroshi NIIMI Hideo OHSHIMA Isao HASEGAWA
Available Online
NII resource type vocabulary Journal Article
Volume 28
Issue 1
spage 12
epage 19
Language eng

Related Publication