scholarly journals Nitrogen Mineralization from Humic Acid Fractions in Rice Soils Depends on Degree of Humification

2004 ◽  
Vol 68 (4) ◽  
pp. 1278-1284 ◽  
Author(s):  
Nguyen Bao Ve ◽  
D. C. Olk ◽  
K. G. Cassman
Keyword(s):  
Humic Acid ◽  
Nitrogen Mineralization ◽  
Rice Soils

THE EFFECT OF THE GAMMA ISOMER OF BENZENE HEXACHLORIDE UPON THE MICROFLORA OF SUBMERGED RICE SOILS: II. EFFECT UPON NITROGEN MINERALIZATION AND FIXATION, AND SELECTED BACTERIA

1967 ◽  
Vol 13 (6) ◽  
pp. 621-627 ◽  
Author(s):  
K. Raghu ◽  
I. C. MacRae
Keyword(s):  
Nitrogen Fixation ◽  
Nitrogen Mineralization ◽  
Soil Nitrogen ◽  
Tropical Soils ◽  
Inhibitory Effect ◽  
Rice Soils ◽  
Native Soil ◽  
Field Practice ◽  
Benzene Hexachloride

The effect of applications of γ-benzene hexachloride (γ-BHC) to two submerged tropical soils at rates equivalent to recommended field practice (5 kg/ha) and 10 times this level upon the mineralization of native soil nitrogen was studied. No inhibitory effect on nitrogen mineralization was detected. A significant increase in the amount of nitrogen mineralized was detected in one of the soils over a period of 16 weeks of submergence. Additions of γ-BHC at 6 kg/ha resulted in significant increases in nitrogen fixation in both soils. Populations of anaerobic, phosphate-dissolving bacteria were found to be higher in the two soils when they were treated with γ-BHC at 6 kg/ha.

Enzymatically and Ultraviolet-Labile Phosphorus in Humic Acid Fractions From Rice Soils

Soil Science ◽  
2009 ◽  
Vol 174 (2) ◽  
pp. 81-87 ◽  
Author(s):  
Zhongqi He ◽  
Daniel C. Olk ◽  
C. Wayne Honeycutt ◽  
Ann-Marie Fortuna
Keyword(s):  
Humic Acid ◽  
Rice Soils ◽  
Labile Phosphorus
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