出版社：Thai Society of Higher Eduction Institutes on Environment
摘要：This study investigated the relationship between physicochemical characteristics of soil and thedistribution of nematodes in coffee rejuvenation areas in Krong Pak and Krong Nang Districts ofDaklak Province, one of the main coffee-growing regions of Vietnam. Thirty soil samples werecollected at the top soil layer in each district for soil properties analysis and nematode analysis,and Pearson Correlation was used to determine the correlation between nematode distributionand soil physiochemical properties. It was found that after a coffee production cycle, clay contentin topsoil layer was still quite high at 39.40% and 50.48% in Krong Pak and Krong Nang respectively.Chemical properties such as acidity (pHKCl) was 4.42 and 4.12; magnesium was 1.2 and1.36 me/100 g soil; organic content was 3.71% and 2.42%. Total nitrogen was 0.18% and 0.15%.Bio-available phosphorus content was 27.11 and 32.9 mg/100 g soil. 10 species of harmfulnematodes were found in the study area, of which 6 species were present in both districts. Thedensity of nematodes including Pratylenchus spp, Meloidogyne exigua and Rotylenchulus reniformiswas negatively correlated with the content of organic matter and Magnesium. Meloidogyne exiguaalso had a negative correlation with the contents of sand and clay. The other seven nematode specieswere found to not significantly correlate with any of the soil physiochemical properties investigated.The finding of this study could be useful for farmers as well as policy makers in designingappropriate cultivation methods in order to reduce the nematode-caused diseases of coffee andto maintain soil quality and health of agricultural ecosystem.
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