Studies On Agricultural And Forestry Waste Compost Addictives In Growing Medium For Pinus Tabulaeformis Container Seedlings

The garden waste compost and mushroom residue compost were tested as substitutes (0-50vol.% and 0-75vol.%) of container medium for growing Pinus tabulaeformis seedlings in greenhouse. The physical and chemical properties of different mediums and their effects on the growth of seedlings were studied.The results showed:(1) As the composition of garden waste compost in the mixed medium increasing, the seed germination percentage, morphological index and biomass of 1-0 Pinus tabulaeformis container seedlings decreased significantly. But compared to the control treatment, seedling height, diameter, height to diameter ratio, tap root length and root biomass did not exhibite significantly changes when the proportions of compost reching 20%, but N mass fraction in root and in whole plant were improved by 14.6%,10.4% respectively in comparison to the control treatment. Higher nutrient levels and EC might be the main reason to decrease the germination percentage and seedling quality. In this study, combined with the substrates materials cost and environmental factors, the best medium prescription is 55% peat,25% perlite and 20% garden waste compost.(2) When the proportions of mushroom residue compost reaching 30%, the seed germination percentage(>80%), seedling height, diameter, shoot biomass and foliar biomass, shoot to root ratio and root index(except the fine root) did not exhibite significant changes compared with the control treatment. But fine root morphology increased significantly, and Nn K mass fraction in seedling foliar were improved by 15.3%,0.4% respectively compared with the control treatmentHigh pH value might be the main reason to decrease the seedling quality when the composition of mushroom residue compost was higher than 40%. In general, the best medium prescription is 45% peat,25% perlite and 30% mushroom residue compost.(3) According to the physical and chemical properties of different mediums and their effects on the growth of 1-1 pinus tabulaeformis transplanting containerized seedling, the mushroom residue compost is completely feasible. When the composition of mushroom residue compost reaching 40%,the rate of survival, seedling height, diameter, and biomass did not exhibite significant changes compared with the control treatment, and nutrient content of seedlings were higher than the control. Seedling quality was relatively high. In this study, the best medium prescription is 35% peat,25% perlite and 40% mushroom residue compost.(4) As the substitutes of peat, mushroom residue compost is more feasible than the garden waste compost for Pinus tabulaeformis container seedling cultivation. Mushroom residue compost is more feasible for cultivating 1-1 pinus tabulaeformis transplanting containerized seedlings than 1-0 container seedlings.