Minimizing nutrient leaching and improving nutrient use efficiency of Liriodendron tulipifera and Larix leptolepis in a container nursery system |
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| Authors: | Byung Bae Park Min Seok Cho Soo Won Lee Ruth D Yanai Don K Lee |
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| Institution: | (1) Division of Forest Ecology, Korea Forest Research Institute, 207, Cheongyangni 2-dong, Dongdaemun-gu, Seoul, 130-712, Republic of Korea;(2) Forest Practice Research Center, Korean Forest Research Institute, Pocheon, 487-821, Republic of Korea;(3) SUNY College of Environmental Science and Forestry, Syracuse, NY 13210, USA;(4) Department of Forest Sciences, Seoul National University, Seoul, 151-921, Republic of Korea |
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| Abstract: | Fertilization is essential to seedling production in nursery culture, but excessive fertilization can contaminate surface
and ground water around the nursery. The optimal fertilization practice is that which maximizes seedling growth and minimizes
nutrient loss. We tested three fertilization strategies: (1) constant fertilization (2) a three-stage rate, and (3) exponential
fertilization on Liriodendron tulipifera and Larix leptolepis containerized seedlings. Growth performance, nutrient uptake, and nutrient loss in leaching were measured. Height, root collar
diameter, and dry weight of both species were not significantly different among treatments even though the nutrient supply
of the exponential treatment was half that of the constant and three-stage treatments. Generally, nutrient losses in leached
solutions were higher in constant and three-stage than the exponential treatment. Nutrient use efficiency was calculated as
the ratio of the nutrient content of the seedlings to the amount of nutrient applied to the containers. The nitrogen use efficiency
in the constant, three-stage, and exponential treatments was 63, 61, and 85% for yellow poplar, respectively, and 35, 30,
and 53% for larch. Similar results were obtained for phosphorus and potassium. Thus, the exponential treatment had the highest
nutrient use efficiency as well as the least nutrient loss. Adjusting fertilization rates can reduce soil and water contamination
around the nursery without compromising growth performance, which reduces both producer’s investments and environmental impacts. |
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