谷秆两用稻稻草作为香菇培养料的氮素转化效率研究

Convertibility of nitrogen in Lentinula edodes using dual-purpose rice straw as media

采用15N同位素示踪技术比较谷秆两用水稻201与特优63水稻在氮吸收规律上的差异,探索利用其稻草替代麦麸或米糠栽培香菇,氮素被菌丝吸收转化为子实体蛋白的转化效率。结果表明,201稻草含氮量、15N回收率分别比特优63稻草提高47.07％和175.33％,而两个品种的稻谷含氮量、15N回收率没有明显差异。用201稻草和米糠栽培香菇的含氮量、15N回收率没有明显差异,含氮量分别为1.23％和1.08％(菌丝)、3.161％和3.526％(子实体),15N回收率分别为5.64％和6.13％(菌丝)、17.939％和19.998％(子实体),均显著高于特优63稻草处理。说明谷秆两用稻稻草具有高效率的氮吸收能力,且其氮素能较好地被香菇转化利用,可作为麦麸或米糠栽培香菇的替代资源。

The nitrogen absorption of dual-purpose rice and its convertibility in the production of Lentinula edodes was studied by 15N isotopic tracer technique. The results showed N content and 15N recoverability of 201 rice straw were increased by 47. 07% and 175. 33% respectively than those of Teyou 63, but the differences of N contont and 15N recoverability in the grains of these two rice varieties were not significant. N content and 15N recoverability of the mycelium and fruit bodies of Lentinula edodes cultivated on the medium of 201 straw were similar to those of rice bran. Their N contents were 1. 23% and 1. 08% for mycelium, 3. 161% and 3. 526% for fruit bodies, 15N recoverability were 5. 64% and 6.13% for mycelium, 17. 939% and 19. 998% for fruit bodies, respectively. The study indicated that dual-purpose rice straw had high N absorption and high N bio-convertibility to Lentinula edodes. Therefore, this straw may substitute to wheat bran or rice bran used for Lentinula edodes cultivation.