Study Of Edible Fungi Residue Used For Tobacco Seedling Substrate

The key of modern tobacco seedling technology is substrate. Traditional seedlings substrate contains peat which is a kind of nonrenewable resources. To continue modern tobacco seedling technology progress, alternative substrate research is especially compelling for tobacco seedling. Sichuan is a province of huge edible fungus production, especially Hypsizigus marmoreus, Lentinus edodes and Flammulina velutipes. Meanwhile, it brings substantial edible fungi residues. If these edible fungi are not used effectively, they would pollute environment. Edible fungi residues contain much nutrients, this paper explored the feasibility of replacing peat for tobacco seedling substrate based on composted edible fungi residues.The results showed that:(1) We got 15 formulas of tobacco seedling substrate by adding different proportion of vermiculate and expanded perlite. Then through the contrast experiment of tobacco seedling, the results showed that compared with the tobacco seedlings cultivated by conventional peat nursery substrate, tobacco seedlings cultivated by nursery substrate formulas that composted Hypsizigus marmoreus residue:vermiculate:expanded perlite= 1:1:1 and composted Flammulina velutipes residue:vermiculate:expanded perlite= 1:1:1 came no significant differences at plant height, leaf number, maximum leaf length, maximum leaf width, the fresh weight and the dry weight of aboveground part, Chlorophyll content and root activity compared with tobacco seedlings cultivated by conventional peat nursery substrate. Conclusively, composted Hypsizigus marmoreus residue and composted Flammulina velutipes residue can replace peat as tobacco seedling substrate.(2) Substrate formulas that composted Hypsizigus marmoreus residue: vermiculate:expanded perlite= 1:1:1 has a bulk density of 0.23g/cm2, total porosity of 86.71%, pH of 7.22 and EC value of 631 us/cm, composted Flammulina velutipes residue:vermiculate:expanded perlite= 1:1:1 has a bulk density of 0.21 g/cm2, total porosity of 85.37%, pH of 7.08 and EC value of 381 us/cm.(3) Mycorrhizal fungi can establish symbiotic relationship with most plant, so it promotes plant to absorption of N, P. so that helps plants’ growth. Added mycorrhizal fungi inoculants to substrate formula that composted Hypsizigus marmoreus residue:vermiculate:expanded perlite= 1:1:1 and composted Flammulina velutipes residue:vermiculate:expanded perlite= 1:1:1 when sowing. The results showed that there were significant differences compared with substrate formula without inoculants at maximum leaf area, the fresh weight and the dry weight of aboveground part, chlorophyll content and root activity, which shows that mycorrhizal fungi inoculants can optimize substrate and reach a better effect on tobacco seedlings.(4) Composted Lentinus edodes residues can not be used as tobacco seedlings substrate, because Composted Lentinus edodes residues has a high EC value and contains low organic matter, which goes against tobacco seedlings growth.(5) We found that Hypsizigus marmoreus residue and Flammulina velutipes residue were cheaper with large amount compared with peat. Conclusively, it is feasible to promote Hypsizigus marmoreus residue and Flammulina velutipes residue used as tobacco seedling substrate.