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Currently there is interest in aggregating technology to fertilizers in order to increase their efficiency. A good example is the use of slow and steady release nitrogen fertilizers. This study was conducted in a greenhouse to evaluate the efficiency of stabilized, slowrelease nitrogen sources in the early development and nutrition of coffee plants (Coffea arabica L.). The treatments followed a factorial 6 × 3 being: six nitrogen fertilizer sources (conventional urea – CU; ammonium nitrate – AN; elemental sulfur coated urea US; elemental sulfur coated urea and polymer - USP; urea combined with organic material - UO, and UO + NBPT - UONBPT); three application times, with four replications. The experiment was conducted for 150 days and the aerial part dry mass production (APDM), that of the leaf (LDM), plus the foliar N concentration and content were evaluated. The use of stabilized slow-release N fertilizers influenced (APDM) and (LDM) production as well as the foliar N concentration and content in coffee plants. The N content in the leaves followed the order: UONBPT <UO <USP <US < AN <CU, contrary to the beneficial effects regarding N availability of fertilizers with associated technology in relation to the conventional source - Urea.

Slow-release stabilized nitrogen fertilizers on initial development and nutrition of coffee plants (Coffea arabica L.)