Effects of controlled-release nitrogen fertilizer application on nitrogen uptake by a leafy vegetable (Brassica campestris L.), nitrate leaching and N2O emission
2007
Amkha, S.(Chiba Univ. (Japan)) | Inubushi, K. | Takagaki, M.
The application of nitrogen (N) fertilizer is an important cultivation option to enhance profitable production in general, and especially in the Southeast Asian countries or other tropical countries. In some cases, large amounts of N remain in soils after the crops are harvested, leading to the deterioration of the groundwater quality through nitrate leaching and of air quality through nitrous oxide (N2O) emission. The purpose of the present study was to determine the effects of three types of controlled-release N fertilizers (CRFs) on: a) leafy vegetable growth, b) nitrate leaching from the surface (0-20cm) soil, and c) N2O flux in the soil surface. Komatsuna (Brassica campestris L.) plants were grown in plastic containers filled with arable soil, and five treatments were applied as follows: application of CDU, UBF, UBM2 and urea fertilizers, and control (no N fertilizer). Three types of CRFs and urea were applied at the rate of 150 kg N/ha. The treatments with UBM2 and urea resulted in the highest values for the growth parameters and N uptake of Komatsuna plants. The amounts of total nitrate in the leachate were significantly higher in the UBM2 and UBF treatments than in the CDU and urea ones. The highest N2O emission from soil was observed in the CDU treatment followed by UBF, UBM2, urea and the control. The nitrogen use efficiency was highest in the treatments with UBM2 and urea.
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