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Estimation of Soybean N Fraction Derived from N Sources by $^{15}N$ in Soybean Cultivation with Rye as Green Manure  

Seo, Jong-Ho (National Institute of Crop Science)
Lee, Seong-Hee (National Institute of Crop Science)
Cho, Young-Son (National Institute of Crop Science)
Lee, Jae-Eun (National Institute of Crop Science)
Lee, Chung-Keun (National Institute of Crop Science)
Kwon, Young-Up (National Institute of Crop Science)
Publication Information
KOREAN JOURNAL OF CROP SCIENCE / v.53, no.1, 2008 , pp. 50-57 More about this Journal
Abstract
Winter season cultivation of rye as green manure for soybean have been a favorite with farmer because it could remove a risk of injury by continuous cropping and increase N uptake and yield of soybean. Effects of rye green manure on soybean N uptake, $N_2$ fixation and yield were investigated with $^{15}N$ as pot experiment in greenhouse in 2004 and field in 2005, respectively. The N derived from N fertilizer ($^{15}N$) in rye green manure increased with increasing of N fertilizer rate compared to N derived from soil. N uptake and DM yield of soybean at the pot with paddy soil was higher than those at the pot with upland soil mainly due to the increase of N uptake from paddy soil. Total $^{15}N$ recovery in soil was higher at rye green manure than no green manure because $^{15}N$ applied to rye plant was remained highly as soil organic N compared to chemical N fertilizer. $^{15}N$ recovery in soybean plant increased in proportion to amounts of N fertilizer applied to rye. The N fractions from $N_2$ fixation of soybean plant at the pot experiment in 2004 ranged from 92% to 95%, on the other hand those in field experiment in 2005 ranged from 82% to 84%. Estimation of amount of $N_2$ fixation was not different between Difference method and $^{15}N$ method in 2004 and 2005.
Keywords
soybean; rye; green manure; 15-nitrogen; N recovery$N_2$ fixation;
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