The Fate of 15N-labeled Organic Materials Applied to Chinese Cabbages Cropping System

다국어 초록 (Multilingual Abstract)

Nitrogen added to farmland is used to plants or remains in soil, or is lost to environment. We incorporated15N-labeled materials (Chemical fertilizer (CF), green manure (GM), livestock compost (LC), GM+LC, andoil cake (OC) to soil and cultivated Chinese cabbages (Brassica rapa subsp. pekinensis) and analyzed the 15Nrecovery of crop and soil to investigate the fate of nitrogen. The results follow. The 15Ncrop recovery ofchemical fertilizer (CF) was the highest, and that of organic materials differed by type. The 15Nsoil recovery ofCF was the lowest, and that of organic materials was 3 - 6 times higher than CF. The 15Nloss was not significantlydifference between CF and organic materials (except GM+LC). As results, despite of the same amount ofnitrogen input, there was the difference in plant uptake and soil residue between organic materials and CF.
Nitrogen of CF is used to Chinese cabbages more than organic materials, however most of the remainingnitrogen is estimated to be lost to the environment. Therefore, CF might be hard to occur residual effect in thenext cropping season. In organic materials, nitrogen is less used to Chinese cabbages than CF, but remains insoil more than CF. Therefore, organic materials might be useful for improving soil fertility and have a residualeffect in the next cropping season. We suggest that these properties of organic materials should be taken intoaccount in calculating the amount of applied fertilizer in organic farming where mainly organic materials areused. Moreover, it is necessary to investigate the cumulative and residual effects of continuous input of thesame organic materials.

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