Journal of Food, Agriculture and Environment

Mineralized N of plant residues with different C:N ratios under upland and rice paddy condition

Author(s):

Youn Lee, Hyun-Sug Choi *, Jae-Hoon Shin, Sang-Min Lee

Recieved Date: 2011-11-18, Accepted Date: 2012-01-03

Abstract:

Seven organic materials commonly used in South Korea were prepared to evaluate mineralized N in upland and rice paddy soils associated with clay loam and sandy loam soil textures at 20°C, 25°C and 30°C under the controlled condition. Organic materials included: 1) palm meal, 2) castor meal, 3) rice hull, 4) tomato residue, 5) water melon residue, 6) potato residue, and 7) garlic residue. C:N ratio of organic materials was lowest for the castor meal (7.4:1), followed by potato residue (14.3:1), tomato residue (14.7:1), water melon residue (17.6:1), palm meal (18.2:1), garlic residue (23.1:1) and rice hull (210.8:1). Castor meal with the lowest C:N in upland soil maintained the highest mineralized N at 20°C, 25°C and 30°C during the period from 0 to 112 days, followed by tomato residue, while the rice hull with the highest C:N ratio had the lowest mineralized N. Mineralized N in organic materials varied in the rice paddy soil. C:N ratio of the organic materials was strongly correlated to the mineralized N in the upland soil, which was not observed in rice paddy soil. 

Keywords:

C:N ratio, crop, mineralization, organic materials, paddy, upland

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Journal: Journal of Food, Agriculture and Environment
Year: 2012
Volume: 10
Issue: 1
Category: Environment
Pages: 808-812

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