Impact of Spent Mushroom Substrate on Soil Microarthropods in Spent Automobile Lubricant Habitat-Types at University Farm, University of Port Harcourt, Rivers State, Nigeria. (Published)
This study aimed at investigating the impact of spent mushroom substrate on soil microarthropods in spent automobile lubricant habitat-types at the University of Port Harcourt farm (40511.33.0N; 60551 20.0E). Soil samples were collected from two depth ranges (0-10cm, 10-20cm) of contaminated (2L, 4L lubricant),remediated (2L + 1.7Kg, 4L + 1.7Kg substrate) and zero treatment (control) habitat-types. The samples were extracted in modified Berlese-Tullgren funnels. A total of 24 taxa of soil microarthropods were collected with 9 and 7 from 2L-and 4L-contaminated, 21 and 18 from 2L, 4L + substrate habitat types respectively. A total of 896 individual soil microarthropods were recorded with 285 or 31.6% (control), 76 or 8.4% (2L contaminated), 57 or 6.3% (4L-contaminated), 289 or 32.9% (2L + substrate) and 189 or 21% (4L + substrate) habitat-types. The THC values were 12.1mg/kg (2L-contaminated),13.1mg/kg (4L-contaminated), 4.8mg/kg (2L+substrate) and 6.4mg/kg (4L+substrate). After 10weeks of post remediation, a reduction of 43.2% (7.3mg/kg) in THC was recorded in 2L-remediated habitat-types,which also had 12species,out of 15 that were absent in the 2L-contamianted habitat-types. The data showed a significant difference in both abundance and THC between 2L contaminated and 2L+substrate amended habitat-types.
Soil Microarthropod- Indicators of Effects of Living Mulches in Sole and Mixed Cropping Systems at University Park Farm, Port Harcourt, Nigeria (Published)
This study was undertaken (May – August, 2013) to ascertain the impact of living mulch cover crops on soil microarthropods in sole and mixed cropping systems. Maize (Zea mays), watermelon (Citrullus lanatus), pumpkin (Telfairia occidentalis) and Egusi-melon (Citrullus cococynthis) were cultivated in sole while Maize- watermelon, Maize – Egusi-melon and Maize – pumpkin were cultivated in mixed plots, in a Completely Radomized Design. Soil samples were collected at 21 days interval with an 8.5cm bucket- type soil auger for extraction in modified Berlese-Tullgren funnel. The result showed 12species and 84 individuals (control), 15 and 317 (sole), 18 and 455 (mixed) cropping plots. Living mulch cover crops increases soil microarthropods in the mixed cropping system as there was significant difference (F=0.22, df =1 P>0.05 ) between the sole and mixed cropping. The average soil moisture within 42days was 30.9 %( mixed), 20.9 %( sole) and 24.4(control). Three species; Parallonothrus nigerensis, Gamisinia and Parasitid were absent in the control and sole but occurred at mixed cropping plots, indicaing that intercropping water- melon or egusi- melon with maize increases the moisture, health of the soil, species richness and abundance of soil microarthropods.