Influence of soil texture and organic matter content on bulk density, air content, compression index and crop yield in field and laboratory compression experiments

摘要: Abstract In the years 1971–1980, effects of compaction during spring sowing was investigated in more than 100 field experiments Sweden. The had similar plans, with four levels created by tractor traffic, and were usually sown barley ( Hordeum vulgare , L.). Soil from 70 sites ground passed through a 2 mm sieve, then compressed uniaxial compression test. data used to study influence soil texture organic matter content on physical properties crop yield after compression. field, bulk density decreased while air increased increasing content. On soils >50 g kg −1 all traffic treatments average compared untrafficked soil, most compacted treatment 11% lower matter. index virtually unaffected content, obtained test positively correlated clay Contrary results, high not decrease degree compactness or an increase Compression greater laboratory especially at stress for demonstrate importance reduce negative compaction. They also difficulty assessing susceptibility traditional