Greenhouse Pot Experiments With Pine Seedlings: Methods for Reducing Variability
Analyses of variance were made of a series of fertilizer experiments with pine seedlings grown in greenhouse pots. Variability of dry matter yields and nutrient uptake was evaluated in terms of standard deviation (SD) per pot and coefficients of variability (CV) calculated from the error mean squares. CV usually decreased markedly with increase in yields per pot; SD sometimes also decreased with increased yield but more often it increased. SD and CV decreased with method of establishing the plants in pots of soil as follows: transplanting a single year-old, field nursery-grown seedling in a pot » direct seeding to leave 4 to 6 seedlings per pot > transplanting 4 to 6 germinated seedlings per pot. The last method plus growth of the seedlings to yields of at least 25 g dry weight of tops per pot resulted in a CV of 5 to 10 percent. Values for SD and CV were usually higher for roots than for top growth and were higher for nutrient uptake than for dry matter. Forest Sci. 16:432-441.
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Document Type: Journal Article
Affiliations: Plant Physiologist, National Fertilizer Development Center, Tennessee Valley Authority, Muscle Shoals, Alabama 35660
Publication date: 1970-12-01
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- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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