Studies On Adding Of Agricultural And Forestry Waste Compost In Container Seedling Growing Medium Of North China Larch

As the result of overweight in growing mediums of container seedling and an extensive use of peat may bring some economic and environmental problems, an experiment was conducted to study the effects of different proportions of mushroom residue compost and garden waste compost as medium additives on morphological indexes and nutrient status of containerized Larix principis-rupprechtii seedlings. The physical and chemical properties of the medium were also studied to explore the feasibility of mushroom residue compost and garden waste compost on the container seedling culture medium. The results show that:(1) For one year old container seedlings, when the ratios of mushroom residue compost were in 0-20%, the concentration and content of nutrient elements in seedlings was higher than the control and the seedling height, ground diameter, biomass, root index had no significant difference with the control. When the ratio was higher than or equal to 30%, the seedling morphological indexes were significant lower than control, seedling growth was adversely affected. The seedlings grew better in medium with 25% perlite+10% mushroom residue compost+65% peat or 25% perlite+20% mushroom residue compost+55% peat.(2) The transplanted container seedlings grew better in medium with 15% mushroom residue compost +25% perlite+ 60% peat, morphological indexes and nutrition of the seedlings were higher than the control. When the ratios of mushroom residue compost were less than 40%, some morphological indicators of the seedlings were decreased than the control, but not significantly, and the content of nutrient elements in seedlings was higher than the control. At last, the ratios of mushroom residue compost less than 40% were suitable for the growth of transplanted container seedlings.(3) Garden waste compost had a negative effect on the seedlings growth, even with 10% of 10% ratio, seedling morphological indexes were significantly decreased, so garden waste compost was not ideal for seedlings growth of north China larch.