Properties and available micronutrient status of some soils derived from Abeokuta formation in Nigeria     

Anjorin Godwin Ajiboye  Morolake Omolola Aduloju 《Archives of Agronomy and Soil Science》2013,59(10):1393-1408

Available iron, zinc, copper and manganese were determined in six pedons located in upper slope, middle slope and valley bottom soils derived from Abeokuta geological materials in Nigeria. The soils had an average of 639.8 g kg^?1 sand, 241.8 g kg^?1 clay and 118.4 g kg^?1 silt. The fertility status of the soils was low–medium with a strongly acid–neutral reaction, 1.3–15.1 g kg^?1 organic carbon contents, moderate–high exchangeable bases and 1.38 mg kg^?1 available phosphorus. Both Fe (122.50 mg kg^?1) and Mn (111.40 mg kg^?1) occurred at toxic levels, whereas the mean Cu (1.27 mg kg^?1) and Zn (2.56 mg kg^?1) contents were found to be adequate for most crops grown in the region. There were significant positive correlations among the micronutrients and also between soil pH, organic carbon, particle size fractions and micronutrients. The high levels of Fe and Mn were probably due to the presence of oolitic ironstone in the parent material.  相似文献   

Organic carbon fractions and micronutrient status of soils under some plantation crops in southwestern Nigeria     

Anjorin G. Ajiboye  Morolake O. Aduloju  Olusegun A. Jaiyeola 《Archives of Agronomy and Soil Science》2013,59(8):1089-1105

The organic carbon (OC) fractions and micronutrient status of soil under cashew (Anacardium occidentale), plantain (Musa spp), oil-palm (Elaeis guineensis) and gmelina (Gmelina arborea) plantations were studied to determine their effectiveness for managing converted forest in the derived savanna ecology of southwestern Nigeria. The control secondary forest soil had statistically similar OC (2.11%) at 0–15 cm with gmelina but significantly higher than those of the remaining plantation crops. At deeper depths, however, the OC content of the control forest was lower than those of other plantation crops. Apart from gmelina, other plantation crops had carbon enrichment ratio (CER) <1 at 0–15 cm. Only gmelina sequestered as much non-hydrolysable carbon (NHC) as the control at 0–15 cm depth. Also it was observed that plantain plantation sequestered higher NHC than the control at 15–30 cm depth. At >30 cm depth, however, none of the plantation crops sequestered as much NHC as the control. Using the average NHC at all the soil depth as a quality index, gmelina has a better potential to sequester NHC than the other plantation crops used in this study.  相似文献