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- W1969966503 abstract "The relationships of crop yield with soil factors such as microbial biomass (Cmic), basal respiration, microbial biomass-to-organic C (Cmic.:Corg) ratio, and metabolic quotient (qCO2) were investigated in three long-term field experiments in Alabama. On all three sites soybean (Glycine max L.) yield was significantly correlated with Cmic: (r = 0.77). On the Auburn and Brewton sites, there were positive correlations of Cmic with the yields of sorghum, rye and corn. Only in a few cases, soil nutrient contents (N, P. K) were significantly correlated with Cmic. The Cmk:Corg ratio increased with crop yield. The data suggest that part of the variability of Cmic and the Cmk:Corg ratio which to a great entent are determined by the climatic conditions at a certain site, may be explained with differences in crop yield. These may in turn be caused by mineral fertilization. No relationship was found between basal respiration and soybean yield. However, the qCO2 was negatively correlated with soybean yield (r = − 0.78) on all sites. This has important implications on agriculture: if more C is lost by respiration at less C input, more care must be taken to maintain organic C contents." @default.
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- W1969966503 date "1991-01-01" @default.
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- W1969966503 title "Relationship of soil microbial biomass and activity with fertilization practice and crop yield of three ultisols" @default.
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- W1969966503 doi "https://doi.org/10.1016/0038-0717(91)90010-h" @default.
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