JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2017, Vol. 60 ›› Issue (01): 75-81.doi: 10.3969/j.issn.1000-2006.2017.01.012

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Effect of sub-irrigation with slow-release fertilizer on growth and accumulation of nitrogen of Larix principis-rupprechtii Mayr container seedlings

WAN Fangfang, LIU Yong*, LI Guolei, SUN Qiaoyu, JIANG Le, SHI Wenhui, TENG Fei, ZHANG Jin   

  1. Key Laboratory for Silviculture and Conservation of Ministry of Education, College of Forestry, Beijing Forestry University, Beijing 100083,China
  • Online:2017-02-18 Published:2017-02-18

Abstract: 【Objective】Determining the appropriate slow-release fertilizer(SRF)application rate of Larix principis-rupprechtii Mayr container seedling, and exploring the effect of fertilizer with sub-irrigation on seedling growth and nitrogen accumulation.【Method】An univariate completely randomized block design with treatments of 50,100,150 mg/ind(mg per individual)SRF was applied.Seedling morphological indexes, nitrogen concentration, media pH and electrical conductivity(EC)at different depth in different growth period were measured with different treatments.【Result】There were significant effects for plant height and root-collar diameter in different fertilizer application rates at different growth period. The largest plant height(34.38cm)and root-collar diameter(3.67 mm)were detected at 100 mg/ind SRF treatment. There was a significant effect on the root biomass at the end of the growing season, while the biomass of the stem and leaf was significantly different at different growth stages. The total seedling biomass was the highest(1.80 g)at the 100 mg/ind SRF treatment at the end of the growing season. The nitrogen concentration and nitrogen content in different organs increased with the increasing fertilizer application rate. N concentration and N content in 150 mg/ind SRF treatments were significantly higher than that of 50 mg/ind SRF, while no significant difference was observed between 100 mg/ind SRF and 150 mg/ind SRF treatments. The 150 mg/ind SRF treatment had the largest N concentration and content, the nitrogen concentrations of root, stem and leaf were 1.78%, 1.28% and 2.14%, respectively, and the nitrogen contents were 8.41, 9.56, 11.71 mg/ind, respectively. However, the seedling morphological indexes including height, diameter and biomass declined. The EC value of the media increased and the pH value decreased with the increasing fertilizer application rate, and the EC value of the top media layer was higher than that of the bottom layer, while the pH value of the top layer was lower than the bottom, however, these did not affect the seedling quality.【Conclusion】SRF could promote the growth and nitrogen accumulation of L. principis-rupprechtii container seedlings. The optimum SRF amount is 100 mg/ind SRF per seedling under sub-irrigation.

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