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Effect of substrate ratio and slow-release fertilizer loading on the quality of large size container seedlings of Phoebe chekiangensis
Pages: 67-73
Year: Issue:  6
Journal: Journal of Nanjing Forestry University(Natural Science Edition)

Keyword:  Phoebe chekiangensislarge size container seedlingsubstrate ratioslow-release fertilizer loading;
Abstract: One?year?old container seedlings of Phoebe chekiangensis were used as materials. Quality indexes including growth and nutrient status of large size container seedlings( two?year?old) cultivated under factorial experimental design with two factors of substrates and slow?release fertilizer ( SLF) were measured. The results showed that: growth of the container seedlings were affected obviously by slow?release fertilizer, while the effect of mud and peat ratio in substrate on seedling growth was weaker than that of SLF. And neither substrate proportion nor SLF had obvious effect on seedling height, ground diameter and ratio of root to shoot. However, both of the two factors had obvious effect on nutrition ab?sorption of the seedlings. Effects of SLF level on the seedlings mainly reflected on seedling dry matter and the root growth. The optimal SLF level for seedling dry matter and root growth were 2.5 kg/m3 and 3.5 kg/m3 respectively. The root development indexes showed that the treatment combinations of S1(peat 45%+rice husk 40%+mud 15%)+F2(2.5 kg/m3), S1+F3(3.5 kg/m3), S2(peat 35%+rice husk 40%+mud 25%)+F2 and S2+F3 were better. Combination of S1+F2 displayed the most large plant dry matter, which was 56.48 g, followed by the combinations of S1+F3, S2+F2, with 54.05 g and 52.07 g respectively. While, N content of container seedling for substrate S2 was significantly higher than that for substrate S1. However, P content in leaves and roots with substrate S1 was higher. With the increasing of fertilization, N content in container seedlings raised, whereas P content decreased. It could be concluded that container seedlings of two?year?old Ph. chekiangensis was not sensitive to substrate ratio but sensitive to SLF. So, substrate ratio can be varied according to requirement and production cost. While, cultivating of the high quality container seedlings should choose fertilizer with high N and low P . The N does of fertilizer for the seedling cultivation should not be less than 1 850 mg/stem, and that for P should not be higher than 350 mg/stem.
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