Nitrogen use efficiency of urea fertilizer is very low for various crops and very large proportions of the fertilizer nitrogen are lost from the crop field through ammonium volatilization, nitrification and de-nitrification, and nitrate leaching. Therefore, to reduce nitrogen losses and the adverse effect of nitrogenous fertilizer on the environment a slow release of highly efficient polyurea microcapsule nitrogenous fertilizer is developed for prolonging release of nitrogen in soil. In this context, neem seed oil encapsulated polyurea microcapsule is developed by interfacial polymerization approach. Polyurea microcapsule contains 68.98% carbon, 11.31% hydrogen and 5.95% nitrogen. The mean particle size of the synthesized polyurea microcapsule was 2.137 µm. The synthesized 0.5 G, 0.0 G dendrimer and polyurea microcapsule were characterized by Fourier transform infrared spectroscopy. Disappearance and appearance of peak at 2841.76 cm⁻¹ and 1745.94 cm⁻¹ confirmed the synthesis of 0.0 G PAMAM and amide bond formation in polyurea microcapsule, respectively. The stability of polyurea microcapsule was confirmed by thermogravimetric analysis. Results of incubation study showed that sustained release of NH₄⁺–N and NO₃⁻–N from polyurea microcapsule under field capacity as well as under submerged condition. Hence, polyurea microcapsule could be a suitable option in as a source of nitrogen for crops under field condition.

尿素肥料对各种作物的氮素利用效率很低，很大比例的肥料氮通过氨挥发、硝化脱硝和硝酸盐浸出从农田中流失。因此，为了减少氮素损失和氮肥对环境的不利影响，开发了一种缓释高效聚脲微胶囊氮肥，以延长土壤中氮的释放时间。在此背景下，印楝籽油包裹的聚脲微胶囊是通过界面聚合方法开发的。聚脲微胶囊含有 68.98% 的碳、11.31% 的氢和 5.95% 的氮。合成的聚脲微胶囊的平均粒径为 2.137 µm。合成的 0.5 G, 0. 0 G树枝状聚合物和聚脲微胶囊通过傅里叶变换红外光谱表征。2841.76 cm处峰的消失和出现^-1和 1745.94 cm ^{-1 分别}证实了 0.0 G PAMAM 的合成和聚脲微胶囊中酰胺键的形成。通过热重分析证实了聚脲微胶囊的稳定性。孵化研究的结果表明，NH ₄ ⁺ -N 和NO ₃ ^- -N 从聚脲微胶囊在场容量和浸没条件下持续释放。因此，聚脲微胶囊可作为田间作物氮源的合适选择。