We aimed to investigate the effect of combining urea humate and wood vinegar on the improvement of saline soils and the yield of wheat and maize. The following seven treatments were designed and conducted for 2 years, a no nitrogen fertilizer (CK) treatment, and a further six treatments consisting of a combination of three rates of urea humate (H0: no urea humate; H1: 50% urea humate; H2: 100% urea humate) and two rates of wood vinegar as a foliar fertilizer (W0: no wood vinegar; W1: 90 L ha⁻¹ wood vinegar). The results indicated that the wood vinegar treatment increased wheat yields by 12.4–44.3% and maize yields by 6.8–13.7% and that 100% urea humate application increased wheat yields by 8.1–38.0% and maize yields by 3.5–9.7%. Furthermore, nitrogen use efficiency was significantly improved with the combined application of humic acid urea and wood vinegar. Compared with the no urea humate treatment (H0), at the end of the 2-year field trial, microbial biomass carbon and nitrogen increased by 9.8–24.9% and 18.1–29.2%, respectively, urease activity decreased by 16.6–25.0%, and mineral nitrogen (NH₄⁺-N and NO₃^--N) content increased in the 0–40 cm soil layer. Collectively, our findings thus indicate that the combined application of urea humate and wood vinegar can increase the yields and nitrogen fertilizer utilization of rotation wheat and maize, although the extent of these increases differed according to the amount of urea humate input.

我们的目的是研究腐植酸尿素与木醋液混合使用对盐渍土改良以及小麦和玉米产量的影响。设计并实施了以下7种处理方法，为期2年：无氮肥（CK）处理，以及另外六种处理方法，包括三种腐殖酸尿素比率（H0：无腐殖酸尿素； H1：50％腐殖酸尿素； H2：100％腐殖酸尿素）和两种比率的木醋作为叶面肥（W0：无木醋； W1：90 L ha ^-1木醋）。结果表明，木醋处理使小麦增产12.4-44.3％，玉米增产6.8-13.7％，100％腐植酸尿素施用使小麦增产8.1-38.0％，玉米增产3.5-9.7％。此外，腐植酸尿素和木醋的组合施用显着提高了氮的利用效率。与不使用尿素腐殖酸盐处理（H0）相比，在为期两年的田间试验结束时，微生物生物量碳和氮分别增加了9.8–24.9％和18.2–29.2％，尿素酶活性下降了16.6–25.0％，和矿物氮（NH ₄ ⁺ -N和NO ₃ ^--N）含量在0–40 cm土层中增加。总体而言，我们的发现因此表明，腐植酸尿素和木醋的组合施用可以提高轮作小麦和玉米的产量和氮肥利用率，尽管这些增加的程度根据腐植酸尿素的投入量而有所不同。