musibau Azeez

Obafemi Awolowo University,Ile-Ife,Nigeria, Soil Science and Land Resources Management, Faculty Member

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Musibau Oyeleke Azeez had a PhD in Soil Chemistry and Fertility at Aarhus University, Denmark, and currently a Senior Lecturer at Obafemi Awolowo University, Ile-Ife, Osun State, Nigeria.
Address: Ile-Ife, Osun State, Nigeria

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Università degli Studi di Padova

Università di Torino

University of Natural Resources and Life Sciences, Vienna (BOKU)

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Geoderma

The distribution of fertilizer phosphorus (P) in the soil profile affects its plant availability ... more The distribution of fertilizer phosphorus (P) in the soil profile affects its plant availability and the risk of P loss. We examined the P distribution and sorption in soil profiles of a field experiment initiated in 1942 on coarse sandy soil with four rates of lime (0, 4, 8 or 12 t ha -1 every 5-9 years) and two rates of P (no P or 15.6 kg P ha -1 annually). In 2016, intact soil cores were retrieved to 100 cm depth and divided into five depth intervals (0-20, 20-30, 30-50, 50-70 and 70-100 cm). Soil samples were analyzed for total P, P extracted with sodium bicarbonate (Olsen P) and water (P w ), oxalate-extractable P (P ox ), iron (Fe ox ) and aluminum (Al ox ), pH, carbon (C), and single point sorption index (PSI). Liming raised soil pH significantly at all depths. Addition of P increased total P, Olsen P, P w and P ox in the upper 30 cm only. In the topsoil the extractability of P in bicarbonate (Olsen P to total P ratio) and water (Pw to total P ratio) declined with liming. Below 30 cm, soil P pools were unaffected by lime and P application. PSI increased with depth until 50-70 cm and related strongly to content of Al ox , but not to Fe ox , Olsen P, soil C and pH. We conclude that Al ox plays a dominating role for retention of P in this sandy soil profile, formed by melt-water during the Weichsel glaciation period. The retention of P in soil below 30 cm depth was strong and unaffected by addition of lime.

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Effects of Copper Fungicides Spray on Nutrient Contents in Soils of Cocoa Growing Areas of Southwestern Nigeria

Tanzania Journal of Science, 2021

The present study aimed at evaluating the effects of copper fungicides spray on physical and chem... more The present study aimed at evaluating the effects of copper fungicides spray on physical and chemical properties of soils of cocoa growing areas of southwestern Nigeria. Samples were collected from selected cocoa farms and adjacent plots across three states (9 samples from Osun State, 9 samples from Ondo State and 7 samples from Ekiti State), within rainforest zone of Nigeria. The physical and chemical properties of the soil samples were determined. Copper contents of the cocoa plantation soils were significantly higher (16.23 mg Cu/kg) than the adjacent plots (6.31 mg Cu/kg) indicating accumulation of Cu in the soil because of long-term Cu fungicides spray. Other chemical properties determined (pH, Zn, % organic matter, % total N, Ca, Mg and Na) also had higher values in cocoa plantations compared to adjacent plots. Significant decrease was observed in available P in soil samples from cocoa plantations (24.05 mg P/kg) when compared with adjacent plots (30.36 mg P/kg). Management pr...

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Phosphorus in an arable coarse sandy soil profile after 74 years with different lime and P fertilizer applications

Geoderma, 2020

The distribution of fertilizer phosphorus (P) in the soil profile affects its plant availability ... more The distribution of fertilizer phosphorus (P) in the soil profile affects its plant availability and the risk of P loss. We examined the P distribution and sorption in soil profiles of a field experiment initiated in 1942 on coarse sandy soil with four rates of lime (0, 4, 8 or 12 t ha −1 every 5-9 years) and two rates of P (no P or 15.6 kg P ha −1 annually). In 2016, intact soil cores were retrieved to 100 cm depth and divided into five depth intervals (0-20, 20-30, 30-50, 50-70 and 70-100 cm). Soil samples were analyzed for total P, P extracted with sodium bicarbonate (Olsen P) and water (P w), oxalate-extractable P (P ox), iron (Fe ox) and aluminum (Al ox), pH, carbon (C), and single point sorption index (PSI). Liming raised soil pH significantly at all depths. Addition of P increased total P, Olsen P, P w and P ox in the upper 30 cm only. In the topsoil the extractability of P in bicarbonate (Olsen P to total P ratio) and water (Pw to total P ratio) declined with liming. Below 30 cm, soil P pools were unaffected by lime and P application. PSI increased with depth until 50-70 cm and related strongly to content of Al ox , but not to Fe ox , Olsen P, soil C and pH. We conclude that Al ox plays a dominating role for retention of P in this sandy soil profile, formed by melt-water during the Weichsel glaciation period. The retention of P in soil below 30 cm depth was strong and unaffected by addition of lime.

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Depletion, accumulation and availability of soil phosphorus in the Askov long-term field experiment

Soil Research, 2020

Soil phosphorus (P) reserves, built up over decades of intensive agriculture, may account for mos... more Soil phosphorus (P) reserves, built up over decades of intensive agriculture, may account for most of the crop P uptake, provided adequate supply of other plant nutrients. Whether crops grown on soils with reduced supply of other nutrients obtain similar use-efficiency of soil P reserves remains unclear. In treatments of the Askov Long-Term Experiment (initiated in 1894 on light sandy loam), we quantified changes in soil total P and in plant-available P (Olsen P, water extractable P and P offtake in wheat grains) when P-depleted soil started receiving P in rock phosphate and when P application to soil with moderate P levels ceased during 1997–2017. Additionally we studied treatments with soil kept unfertilised for >100 years and with soil first being P depleted and then exposed to surplus dressings of P, nitrogen (N) and potassium in cattle manure. For soil kept unfertilised for >100 years, average grain P offtake was 6 kg ha–1 and Olsen P averaged 4.6 mg kg–1, representing th...

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Geoderma

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Effects of Copper Fungicides Spray on Nutrient Contents in Soils of Cocoa Growing Areas of Southwestern Nigeria

Tanzania Journal of Science, 2021

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Phosphorus in an arable coarse sandy soil profile after 74 years with different lime and P fertilizer applications

Geoderma, 2020

The distribution of fertilizer phosphorus (P) in the soil profile affects its plant availability ... more The distribution of fertilizer phosphorus (P) in the soil profile affects its plant availability and the risk of P loss. We examined the P distribution and sorption in soil profiles of a field experiment initiated in 1942 on coarse sandy soil with four rates of lime (0, 4, 8 or 12 t ha −1 every 5-9 years) and two rates of P (no P or 15.6 kg P ha −1 annually). In 2016, intact soil cores were retrieved to 100 cm depth and divided into five depth intervals (0-20, 20-30, 30-50, 50-70 and 70-100 cm). Soil samples were analyzed for total P, P extracted with sodium bicarbonate (Olsen P) and water (P w), oxalate-extractable P (P ox), iron (Fe ox) and aluminum (Al ox), pH, carbon (C), and single point sorption index (PSI). Liming raised soil pH significantly at all depths. Addition of P increased total P, Olsen P, P w and P ox in the upper 30 cm only. In the topsoil the extractability of P in bicarbonate (Olsen P to total P ratio) and water (Pw to total P ratio) declined with liming. Below 30 cm, soil P pools were unaffected by lime and P application. PSI increased with depth until 50-70 cm and related strongly to content of Al ox , but not to Fe ox , Olsen P, soil C and pH. We conclude that Al ox plays a dominating role for retention of P in this sandy soil profile, formed by melt-water during the Weichsel glaciation period. The retention of P in soil below 30 cm depth was strong and unaffected by addition of lime.

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Depletion, accumulation and availability of soil phosphorus in the Askov long-term field experiment

Soil Research, 2020

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