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http://dx.doi.org/10.5338/KJEA.2011.30.1.16

Effects of Nutrient Source on Soil Physical, Chemical, and Microbial Properties in an Organic Pear Orchard  

Choi, Hyun-Sug (Organic Agriculture Division, National Academy of Agricultural Science)
Li, Xiong (Department of Horticulture, Chonnam National University)
Kim, Wol-Soo (Department of Horticulture, Chonnam National University)
Lee, Youn (Organic Agriculture Division, National Academy of Agricultural Science)
Publication Information
Korean Journal of Environmental Agriculture / v.30, no.1, 2011 , pp. 16-23 More about this Journal
Abstract
BACKGROUND: This study was conducted to investigate the effects of different organic treatments and a chemical fertilizer on the soil chemical, physical, and microbial properties in an organic pear orchard. METHODS AND RESULTS: Control was referred as a NPK chemical fertilizer (15N-9P-10K) and organic treatments included compost containing with oil cake, compost containing with humic acid, and compost containing with chitin substance. All treatments applied at rates equivalent to 200 g N per tree per year under the tree canopy in March 30 of 2008 and 2009. Soil bulk density, solid phase, liquid phase, and penetration resistance were not significantly different among the treatments. Organic treatment plots had greater organic matter, total nitrogen, potassium, and magnesium concentrations compared to control, and the nutrient concentrations were not consistently affected by the organic treatments. Microbial biomass nitrogen and carbon, dehydrogenase, acid-phosphatase, and chitinase activities overall increased from March to August. Organic treatments, especially compost containing with oil cake or chitin aicd, increased the microbial variables compared to control. CONCLUSION(s): All the organic treatments consistently stimulated soil biological activity. The consistent treatment effect, however, did not occur on the soil mineral nutrition as the trees actively taken up the nutrients during a growing season, which would have diminished treatment effects. Long-term study required for evaluating soil physical properties in a pear orchard.
Keywords
Chitin; Humic; Oil cake; Organic fertilizer; Soil properties;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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