Characterization of Nitrate Release on Andisols in West and Central Java
Karakterisasi Pelepasan Nitrat pada Andisol di Jawa Barat dan Jawa Tengah
The area of Andisols in Indonesia is about 5.4 million hectares. This soil is used extensively by farmers for horticulture and tea plantation, and to a small portion for livestock. The characteristics of nitrate release are very specific location so that it is necessary to reveal soil properties affecting the pattern of nitrate release on Andisols in West and Central Java. The objectives of the research were to characterize chemical properties of Andisols, characterize parameters of nitrate release on Andisols, and obtain the correlation between chemical properties and the parameters of nitrate release on Andisols in West and Central Java. The experiment of nitrate release was conducted by incubation experiment, then simulated using first-order kinetic. Soil analyses revealed that there was a variation of chemical properties among Andisols in West and Central Java. The release of nitrate on Andisols from Lembang, Pangalengan, Sukamantri and Dieng, in general, decreased with the increase of soil depth in one soil profile and increased with the period of incubation times. A simple correlation test showed that the potential nitrate release (N0) had correlations that were not significant with the analyzed soil properties. However, N0 positively correlated with organic C, total N, oxalate-Fe, dithionite-Al and dithionite-Fe. On the other hand, the N0 negatively correlated with oxalate-Al and Alo + ½ Feo. As for the rate constant (k), all those properties negatively correlated with k value except with dithionite-Fe which had a positive correlation. It suggested that there is a possibility that nitrate release increased with the increase of the content of soil organic C and total N however decreased with the increase of Alo + ½ Feo. Alo + ½ Feo also possibly decreased the rate constant of nitrate release.
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Department of Soil Science and Land Resources Departemen Ilmu Tanah dan Sumberdaya Lahan, Faculty of Agriculture Fakultas Pertanian, IPB University