“Alperujo”堆肥对接种重氮缓生根瘤菌大豆结瘤和共生固氮的促进作用

Nitrogen Pub Date : 2023-05-16 DOI:10.3390/nitrogen4020015
G. Tortosa, S. Mesa, María J. Delgado, Carol V. Amaya-Gómez
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摘要

利用堆肥提高植物生产力和共生固氮(SNF)已被公认为是合成氮肥的有效替代品。这种环境可持续的方法很容易为农民所用。本试验研究了橄榄渣(alperujo, AL)堆肥对大豆(Glycine max L.)及其天然共生体(重氮缓生根瘤菌)结瘤和SNF的影响。为此,大豆植株在可控的温室条件下施用了几种剂量的AL堆肥。试验结束时,测定植物生物量(地上部分和根系)干重、根瘤数和鲜重、氮和豆血红蛋白含量。施用AL堆肥对大豆生长有显著的促进作用,表现为植株生物量和株高的增加。此外,添加AL堆肥可提高根瘤血红蛋白含量和氮含量(分别为7%和40%),表明根瘤效率和共生效率均有提高。本研究结果为AL堆肥对大豆- b的增效作用提供了明确的证据。重氮效率的关联,可能是由于铝堆肥促进了大豆根系的发育,以及根瘤菌对根际有机质和养分的同化。
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“Alperujo” Compost Improves Nodulation and Symbiotic Nitrogen Fixation of Soybean Inoculated with Bradyrhizobium diazoefficiens
The utilization of compost to enhance plant productivity and symbiotic nitrogen fixation (SNF) has been recognized as an effective alternative to synthetic nitrogen fertilizers. This environmentally sustainable method is readily accessible to farmers. This study investigated the effect of olive pomace (“alperujo”, AL) compost on the nodulation and SNF of soybeans (Glycine max L.) and their natural symbiont (Bradyrhizobium diazoefficiens). For that, soybean plants were subjected to several doses of AL compost under controlled greenhouse conditions. At the end of the experiment, the dry weight of plant biomass (aerial part and roots), the number and fresh weight of nodules, and nitrogen and leghaemoglobin contents were analyzed. The application of AL compost significantly improved soybean growth, as demonstrated by an increase in both plant biomass and height. Furthermore, nodular leghaemoglobin content and nitrogen content were found to be enhanced by the addition of AL compost (7 and 40%, respectively), indicating an increase in nodule effectiveness and symbiotic efficiency. Our results provide clear evidence of the synergetic effect of AL compost on the soybean-B. diazoefficiens association, probably due to AL-compost improved soybean roots development, and rhizospheric organic matter and nutrients assimilation by rhizobia.
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