Effects of fertilization regime and rate on growth and needle nutrient level of Pinus armandii seedling

FENG Wei, SHAN Changdan, ZHANG Hui, LIU Jiaman, LIU Guoang, YAO Zengyu

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (3) : 191-198.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2024, Vol. 48 ›› Issue (3) : 191-198. DOI: 10.12302/j.issn.1000-2006.202203029

Effects of fertilization regime and rate on growth and needle nutrient level of Pinus armandii seedling

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Abstract

【Objective】 The effects of different fertilization regimes and rates on the growth of Pinus armandii seedlings and the contents of mineral nutrient elements and non-structural carbohydrates in their needles were investigated to provide a scientific reference for the cultivation of high-quality seedlings with abundant nutrition reserves. 【Method】 P. armandii seedlings were separately reared in the presence of four different doses of N (100, 200, 300 and 400 mg N per seedling) using a compound fertilizer (25% N, 10% P2O5 and 20% K2O) under conventional and exponential fertilization regimes. The control setup was not treated with the fertilizer. The fertilizer was applied 12 times at 2-week intervals. The shoot height, root collar diameter, biomass and the contents of N, P, K, soluble sugar, starch and non-structural carbohydrates in the needles were measured after two weeks of the last application of the fertilizer. 【Result】 The shoot height, root collar diameter and biomass increased at first but subsequently decreased as the rate of the fertilizer was increased, under both application regimes. The shoot height, root collar diameter and biomass were the highest at the dose of 300 mg N per seedling under the exponential fertilization regime, being 1.29, 1.15 and 1.53 fold those of the control. Fertilization enhanced the content of N in the needles, and the N content increased as the rate of the fertilizer was increased. The N content in the needles was higher under the exponential fertilization regime than under the conventional fertilization regime for the same doses of the fertilizer. There were no significant differences in the P content of the needles. The K content in the needles increased at increasing rates of the fertilizer under the conventional fertilization regime. However, the K content increased at first but decreased subsequently at increasing rates of the fertilizer under the exponential fertilization regime. The content of soluble sugar decreased significantly following fertilization, and the contents decreased at first but increased subsequently at increasing rates of the fertilizer. The contents of starch and non-structural carbohydrates in the needles increased significantly under the rational fertilization regime, and exponential fertilization was more preferable. 【Conclusion】 The exponential application of 1.2 g of the fertilizer (300, 120 and 240 mg of N, P2O5 and K2O, respectively) per seedling was found to be the optimal fertilization regimen for cultivating high-quality P. armandii seedlings.

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Pinus armandii / high-quality cultivation / exponential fertilization / nutrient accumulation / non-structural carbohydrates

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FENG Wei , SHAN Changdan , ZHANG Hui , et al . Effects of fertilization regime and rate on growth and needle nutrient level of Pinus armandii seedling[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2024, 48(3): 191-198 https://doi.org/10.12302/j.issn.1000-2006.202203029

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