The interactive effects of straw-derived biochar and bio-based polymer-coated urea (BPCU) was examined with a pot experiment conducted in 2014 and 2015. Using a split-plot design, the main plot factor was the form of straw use and the sub-plot factor was the type of N fertilizer. The soil inorganic nitrogen (N), organic carbon and lint yield of biochar treatments were significantly higher than for straw treatments. Meanwhile, the BPCU treatments enhanced nitrogen use efficiency (NUE) and yield over urea treatments. Biochar combined with BPCU resulted in the highest lint yield, 14.3–108.2% increasing over the other treatments, with NUE 27.1–63.5% increased. We attributed this superior performance to the interactive effects between BPCU’s controlled supply of N according to cotton’s N requirements and biochar’s functionalities in enhancing soil quality. Thus, the application of biochar and BPCU is a sustainable strategy to improve soil quality and increase cotton yield.

通过2014年和2015年进行的盆栽试验，研究了秸秆来源的生物炭和生物基聚合物包被的尿素（BPCU）的相互作用。采用分块设计，主要的影响因素是秸秆的使用形式和亚图因素是氮肥的类型。生物炭处理的土壤无机氮，有机碳和皮棉产量显着高于秸秆处理。同时，与尿素处理相比，BPCU处理提高了氮的利用效率（NUE）和产量。生物炭与BPCU的结合使皮棉产量最高，比其他处理提高了14.3–108.2％，NUE增加了27.1–63.5％。我们将这种优异的性能归因于BPCU根据棉花的氮素需求控制的氮素供应与生物炭在增强土壤质量方面的功能之间的相互作用。因此，生物炭和BPCU的应用是改善土壤质量和增加棉花产量的可持续策略。