Ren Haiyan, Hu Jian, Hu Yifei, Yang Gaowen, Zhang Yingjun
College of Agro-grassland Science, Nanjing Agricultural University, Nanjing, China.
Department of Grassland Science, China Agricultural University, Beijing, China.
PeerJ. 2017 Sep 6;5:e3775. doi: 10.7717/peerj.3775. eCollection 2017.
Application of organic materials into agricultural systems enhances plant growth and yields, and improves soil fertility and structure. This study aimed to examine the effects of "compost extract (CE)", a soil conditioner, and bio-organic manure (BOM) on the growth of lucerne (), and compare the efficiency between BOM (including numbers of microorganisms) and CE (including no added microorganisms).
A greenhouse experiment was conducted with four soil amendment treatments (control, BOM, CE and CEBOM), and was arranged in a completely randomized design with 10 replicates for each treatment. Plant biomass, nutritive value and rhizobia efficacy as well as soil characteristics were monitored.
CE rather than BOM application showed a positive effect on plant growth and soil properties when compared with the control. Lucerne nodulation responded equally to CE addition and rhizobium inoculation. CE alone and in combination with BOM significantly increased plant growth and soil microbial activities and improved soil structure. The synergistic effects of CE and BOM indicate that applying CE and BOM together could increase their efficiency, leading to higher economic returns and improved soil health. However, CE alone is more effective for legume growth since nodulation was suppressed by nitrogen input from BOM. CE had a higher efficiency than BOM for enriching soil indigenous microorganisms instead of adding microorganisms and favouring plant nodulation.
将有机材料应用于农业系统可促进植物生长和提高产量，并改善土壤肥力和结构。本研究旨在考察土壤改良剂“堆肥浸提液（CE）”和生物有机肥（BOM）对紫花苜蓿生长的影响，并比较BOM（包括微生物数量）和CE（不添加微生物）之间的效果。
进行了一项温室试验，设置了四种土壤改良处理（对照、BOM、CE和CEBOM），采用完全随机设计，每个处理重复10次。监测了植物生物量、营养价值、根瘤菌功效以及土壤特性。
与对照相比，施用CE而非BOM对植物生长和土壤性质有积极影响。紫花苜蓿结瘤对添加CE和接种根瘤菌的反应相同。单独施用CE以及CE与BOM组合均显著提高了植物生长和土壤微生物活性，并改善了土壤结构。CE和BOM的协同效应表明，同时施用CE和BOM可提高其效率，带来更高的经济效益并改善土壤健康状况。然而，单独施用CE对豆科植物生长更有效，因为BOM中的氮输入抑制了结瘤。CE在富集土壤本土微生物而非添加微生物以及促进植物结瘤方面比BOM效率更高。
