WSU Tree Fruit Research & Extension Center

Organic & Integrated Tree Fruit Production

Monday, March 25, 2019


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Search results on 03/25/19

1657. Doughty, J.L., F.D. Cook, and F.G. Warder. 1954. Effect of cultivation on the organic matter and nitrogen of brown soils.. Canadian J. Agr. Sci. 34:406-411.
Over 14 yr of cropping, soils lost 26% of OM and 33% of total N. Only part of the N loss is accounted for by crop removal. Some N is lost by leaching, also some gaseous loss of N other than as ammonia.

2331. Gupta, V., and Germida, J.J.. 1988. Distribution of microbial biomass and its activity in different soil aggregate size classes as affected by cultivation.. Soil Biol. Biochem. 20:777-786.
Investigated the effects of 69 yr of cultivation on the nature, distribution, and activity of microbial biomass content in different microaggregate size classes of a native and cultivated soil. Microaggregates (<0.25mm) of both soils contained lower organic-C, microbial biomass, enzymes, and respiration compared to macroaggregates. The negative effects of cultivation were more pronounced on macroaggregates. These results suggest that microbial biomass, especially fungi, plays an important role in the formation of macroaggregates and is the labile organic matter that serves as the primary source of C and nutrients released following cultivation.

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