Abstract
Isobutylidene diurea (IBDU) is well-known as a hydrolytic, slow-release nitrogen fertilizer. The powder of IBDU was granulated by agitation granulator with urea-formaldehyde condensation as a binder, in order to improve the physical characteristic and the fertilizer use efficiency. We termed the granulated product “SUPER-IB”. Three experiments were carried out to evaluate the characteristic of SUPER-IB as a slow-release fertilizer. The breaking hardness (kg/granule) of SUPER-IB was over 1.8, and the hygroscopicity was very low. The mineralization rate of SUPER-IB was increased by higher temperatures. In the paddy rice test, almost equal yields was obtained by only basal fertilization of SUPER-IB in comparison with conventional application of compound fertilizer. It is concluded that SUPER-IB has a ideal physical characteristic and a superior fertilizer use efficiency compared to conventional treatments.
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