Seasonal Dynamics of Fertilizer-Derived Hydrolysable NH3 in an Arable Soil of Northeast China
FUNCTIONAL MATERIALS AND NANOTECHNOLOGY(2012)
Abstract
Fertilizer applications to soil are widely known to be the most important anthropogenic sources to influence soil N turnover in agricultural ecosystems. More information is required on the relationships between soil organic N (SON) forms in order to predict the maintenance, transformation and stability of soil N. Accordingly, N-15-labeled (NH4)(2)SO4 (totally 200 kg N/ha) was applied to a maize crop throughout the entire growing period to investigate the distribution and the dynamics of fertilizer-derived N in hydrolyzable-NH3 fraction by measuring the labeled N in them. The accumulation of N-15 in hydrolyzable-NH3 fraction was time-dependent although the total N concentration changed only slightly. The transformation of the residual fertilizer N to hydrolyzable-NH3-N-15 was maximal during the silking and grain filling stages, suggesting the fertilizer N was immobilized at an early stage during the growing period. The rapid decrease of N-15 in hydrolyzable-NH3 pool indicated that hydrolyzable-NH3-N-15 was a temporary pool for fertilizer N retention and was able to release fertilizer N for uptake by the current crop.
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Key words
Residual fertilizer N,Seasonal N dynamics,15N labeling,Hydrolyzable-NH3 fraction
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