Meng Xianghai, Dong Qingshan, Wang Baicheng, Ni Zheng, Zhang Xingzhe, Liu Chunguang, Yu Wenquan, Liu Jie, Shi Xinrui, Xu Dehai, Duan Yan
Mudanjiang Branch, Heilongjiang Academy of Agricultural Sciences, Mudanjiang 157000, China.
The Centre for Ion Beam Bioengineering Green Agriculture, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China.
Plants (Basel). 2024 Apr 28;13(9):1222. doi: 10.3390/plants13091222.
Microbial-driven N turnover is important in regulating N fertilizer use efficiency through the secretion of metabolites like glycolipids. Currently, our understanding of the potential of glycolipids to partially reduce N fertilizer use and the effects of glycolipids on crop yield and N use efficiency is still limited. Here, a three-year in situ field experiment was conducted with seven treatments: no fertilization (CK); chemical N, phosphorus and potassium (NPK); NPK plus glycolipids (N+PKT); and PK plus glycolipids with 10% (0.9 N+PKT), 20% (0.8 N+PKT), 30% (0.7 N+PKT), and 100% (PKT) N reduction. Compared with NPK, glycolipids with 0-20% N reduction did not significantly reduce maize yields, and also increased N uptake by 6.26-11.07%, but no significant changes in grain or straw N uptake. The N resorption efficiency under 0.9 N+PKT was significantly greater than that under NPK, while the apparent utilization rates of N fertilizer and partial factor productivity of N under 0.9 N+PKT were significantly greater than those under NPK. Although 0.9 N+PKT led to additional labor and input costs, compared with NPK, it had a greater net economic benefit. Our study demonstrates the potential for using glycolipids in agroecosystem management and provides theoretical support for optimizing fertilization strategies.
微生物驱动的氮周转在通过分泌糖脂等代谢产物来调节氮肥利用效率方面具有重要作用。目前，我们对糖脂在部分减少氮肥使用方面的潜力以及糖脂对作物产量和氮利用效率的影响的理解仍然有限。在此，进行了一项为期三年的原位田间试验，设置了七个处理：不施肥（CK）；化学氮肥、磷肥和钾肥（NPK）；NPK加糖脂（N+PKT）；以及PK加分别减少10%（0.9 N+PKT）、20%（0.8 N+PKT）、30%（0.7 N+PKT）和100%（PKT）氮的糖脂。与NPK相比，减少0 - 20%氮的糖脂处理并未显著降低玉米产量，还使氮吸收增加了6.26 - 11.07%，但籽粒或秸秆的氮吸收没有显著变化。0.9 N+PKT处理下的氮素再吸收效率显著高于NPK处理，而0.9 N+PKT处理下的氮肥表观利用率和氮偏生产力显著高于NPK处理。虽然0.9 N+PKT处理导致了额外的劳动力和投入成本，但与NPK相比，其净经济效益更高。我们的研究证明了在农业生态系统管理中使用糖脂的潜力，并为优化施肥策略提供了理论支持。
