FERTILIZER AND TEMPERATURE EFFECTS ON UREA HYDROLYSIS IN UNDISTURBED SOIL

被引：55

作者：

XU, JG ^{[1
]}

HEERAMAN, DA ^{[1
]}

WANG, Y ^{[1
]}

机构：

[1] NE AGR UNIV,DEPT AGRON,HARBIN 150030,PEOPLES R CHINA

来源：

BIOLOGY AND FERTILITY OF SOILS | 1993年 / 16卷 / 01期

关键词：

ACTIVATION ENERGY; CONTINUOUS FERTILIZER APPLICATION; TEMPERATURE; UNDISTURBED SOILS; UREA HYDROLYSIS;

D O I：

10.1007/BF00336517

中图分类号：

S15 [土壤学];

学科分类号：

0903 ; 090301 ;

摘要：

Few published studies have examined the effects of a continuous fertilizer application on urea hydrolysis. In the present study we investigated the effects of 9 years of continuous application of urea and P fertilizers on urea hydrolysis in undisturbed soil samples as affected by temperature (5-45-degrees-C). Undisturbed soil samples of surface horizons (0-7 cm) were obtained with cutting rings (50 cm3 from different fertilizer-treatment plots and inserted in polyethylene bottles (with cutting rings). Each soil sample (in the cutting ring) was treated with 10 ml urea solution (0.5 mmol urea N g-1 soil) and then brought to 90% field capacity. The samples were left to equilibrate for 30 min at a temperature of 4-degrees-C, then placed in an incubator at 37-degrees-C for 6 h. The results indicated that 9 years of continuous application of urea but not P had a significant effect on urea hydrolysis in soil. There was a good correlation between temperature and urea hydrolysis in soil. Q10 was between 1.97 and 2.08 in the temperature range 5-45-degrees-C.

引用

页码：63 / 65

页数：3

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