Providing evidence to improve practice

Individual study: Soil microbial activity as influenced by compaction and straw mulching

Published source details

Siczek a. & Frąc M. (2012) Soil microbial activity as influenced by compaction and straw mulching. International Agrophysics, 26, 65-69


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Control traffic and traffic timing Soil Fertility

A randomized, replicated experiment in 2008 on silty soils in Lublin, Poland (Siczek & Frąc 2012) found fewer bacteria (1,700 million colonies/kg) and lower bacterial activity in strongly compacted soil, but higher numbers and activity in moderately compacted soil (4,650 million colonies/kg) compared to an uncompacted treatment (2,600 million colonies/kg). Bulk density was 22.5% and 15.5% higher in the strongly and moderately compacted soil respectively, compared to uncompacted soil (1.3 Mg/m3). There were three compaction treatments in a soybean Glycine max crop obtained using a wheel tractor: strongly (5 passes), moderately (3 passes) and uncompacted (0 passes) soil. There were six replicates, total area for each compaction was not specified. Within each treatment were 1.8 x 2.1 m plots with no mulch, or mulched with straw. Fertilizer was applied uniformly to all plots at 54-70-80 kg/ha NPK. Soil was sampled three times during crop development from the centre of the soybean rows. Microbial parameters including bacterial number and enzyme activities were measured.

 

Add mulch to crops Soil Fertility

A randomized, replicated experiment in 2008 on silty soils in Lublin, Poland (Siczek & Frąc 2012) found that adding a straw mulch increased bacteria counts (3.5 billion colonies/kg) and activity compared to soil with no mulch (2.4 billion colonies/kg). There were three compaction treatments in a soybean Glycine max crop obtained using a wheel tractor: strongly compacted (5 passes); moderately compacted (3 passes); and uncompacted (0 passes) soil. There were six replicates. Within each treatment were 1.8 x 2.1 m plots with either no mulch or a straw mulch. Fertilizer was applied uniformly to all plots at 54-70-80 kg/ha NPK. Bacterial numbers and enzyme activities were measured in soil samples taken three times during crop development from the centre of the soybean rows.