A PRELIMINARY-STUDY TO PREDICT NET NITROGEN MINERALIZATION IN A FLOODED RICE SOIL USING ANAEROBIC INCUBATION

被引:19
作者
ANGUS, JF
OHNISHI, M
HORIE, T
WILLIAMS, RL
机构
[1] KYOTO UNIV,FAC AGR,KYOTO 60601,JAPAN
[2] NSW AGR,YANCO AGR INST,YANCO,NSW 2703,AUSTRALIA
来源
AUSTRALIAN JOURNAL OF EXPERIMENTAL AGRICULTURE | 1994年 / 34卷 / 07期
关键词
D O I
10.1071/EA9940995
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Complementary field and laboratory studies were conducted to determine whether laboratory measurements of net nitrogen (N) mineralisation under anaerobic conditions could be used to predict field rates in a flooded soil and N uptake by a rice crop. The laboratory experiment consisted of measurements of ammonium accumulation at 10, 20, 30, and 40-degrees-C for 7, 14, and 28 days of anaerobic incubation. There was no accumulation of ammonium at 10-degrees-C, but increasing ammonification rate at temperatures of 20-degrees-C was observed, except for a slower rate at 40-degrees-C after 14 days. Two models were tested on the data: a zero-order reaction in which rate of mineralisation was a linear function of temperature; a first-order reaction in which net N mineralisation rate was a proportion of a depleting pool of labile organic N. In the second model, the rate was also linearly related to temperature. Both models fitted the laboratory data well (R2 = 0.94 and 0.97, respectively), but the second model accounted better for mineralisation at 40-degrees-C for the 28-day incubation. These models were then run, using daily mean temperatures over a rice-growing season, to predict net mineralisation in the field. The predictions were compared with measured net N mineralisation in a flooded soil and N uptake by the crop measured throughout the season in the field from which the incubated soil was sampled. Net N mineralisation and crop uptake increased throughout the season, reaching maximum values of 115 and 111 kg N/ha at maturity. The zero-order and first-order models both predicted net N mineralisation accurately until the middle of the season, after which the zero-order model overestimated net N mineralisation but the first-order model predicted the reduction in the rate of net N mineralisation with reasonable accuracy. The close agreement between the laboratory incubations and field measurements of net mineralisation and crop N uptake suggest that incubation tests may provide useful information for including in a model to assist ricegrowers' decisions about N fertiliser.
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页码:995 / 999
页数:5
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