Slow-release fertilizers have been widely used to promote agricultural production with less losses to the environment. However, further achievement of fertilizer with precisely regulable release performance is still full of challenges, especially for the most used nitrogen fertilizer – urea. In this study, we provide a strategy for regulating performance of slow-release urea fertilizer (SRUF) based on inclusion complexation between biodegradable copolyester and urea via simply changing chain composition. The units of butylene adipate (BA) are copolymerized into the main chains of poly(butylene succinate) (PBS) to obtain a series of random copolyesters of poly(butylene succinate-co-butylene adipate) (PBSA). The crystallizability of PBSA declines with increasing BA content, leading to the longer slow-release time for corresponding PBSA/urea inclusion complex fertilizer. The monotonous, nearly linear relationship between chain composition and the slow-release performance of SRUF has been demonstrated, revealing the great potential to design SRUF with precise slow-release time. Consequently, pot trails in the lab are employed to evaluate the promotion effect of SRUF on Brassica chinensis L.. The growth indexes of plants significantly increase with increasing BA content in PBSA chains used in SRUF of inclusion complex. The plants reach about twice of dry weight in optimized group by referring to neat urea group when the SRUF shows a release duration closely matching to the growth cycle of Brassica chinensis L.

缓释肥料已被广泛用于促进农业生产，对环境的损失较小。但是，要进一步实现具有精确可调的释放性能的肥料仍然充满挑战，尤其是对于最常用的氮肥–尿素。在这项研究中，我们提供了通过简单地改变链组成，基于可生物降解的共聚酯和尿素之间的包合作用来调节缓释尿素肥料（SRUF）性能的策略。己二酸丁二醇酯（BA）的单元共聚成的聚（丁二酸丁二醇酯）（PBS）的主链以获得一系列的聚无规共聚酯（亚丁基琥珀酸盐的共己二酸丁二酯）（PBSA）。PBSA的结晶性随BA含量的增加而降低，从而导致相应的PBSA /尿素包合复合肥的缓释时间更长。已证明链组成与SRUF的缓释性能之间存在单调，近乎线性的关系，这揭示了设计具有精确缓释时间的SRUF的巨大潜力。因此，实验室中的盆栽试验被用于评估SRUF对小白菜的促进作用。随着包涵体SRUF中PBSA链中BA含量的增加，植物的生长指数显着增加。当SRUF的释放时间与大豆的生长周期紧密匹配时，通过提及纯尿素组，植物达到优化组的干重的两倍左右。小白菜L.