Effects of fertilizer microdosing on soil phosphorus and sulphur availability to Solanum macrocarpon in Southwest Nigeria
Ifeoluwa Oluwaponle, Francis Olatoberu, Mary Idowu, Durodoluwa Oyedele, Omotayo Akinremi, Ojo Adekunle, Odunayo Adebooye
Journal of Agricultural Sciences, Belgrade 2025 DOI: 10.2298/jas2504385o (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Field experiment, factorial split-plot design with four replicates Peer reviewed |
|---|---|
| Population | Solanum macrocarpon (S. macrocarpon) plants grown in the derived savanna (Ogbomoso) and rainforest (Ilesha) zones of southwest Nigeria |
| Dose | 0, 20, 40, 60, and 80 kg N ha-1; 60 kg N ha-1 plus 5 tons ha-1 |
| Topics | Microdosing |
| Key findings | A fertilizer rate of 20 kg N per hectare produced significantly higher yields and P and S uptake in both the derived savanna (4.2 t/ha) and the rainforest (1.2 t/ha). Application at two weeks after planting gave higher yield (3.3 t/ha) in the derived savanna, while application at planting gave the highest yield (1.2 t/ha) in the rainforest. The authors conclude that 60 kg N per hectare plus 5 tons per hectare is the optimum fertilizer combination for S. macrocarpon production in southwest Nigeria. |
Abstract
This present study aimed at evaluating the effect of fertilizer rate and time of application on yield, and determined the availability of soil P and S to S. macrocarpon. The experiment was conducted in the derived savanna (Ogbomoso) and the rainforest (Ilesha) in southwest Nigeria. The treatments were arranged in a factorial combination and laid out in a split-plot design with four replicates. The main plots were the fertilizer rates of 0, 20, 40, 60, and 80 \, \mathrm{kg \, N \, ha^{-1}} (without organic fertilizer), with the time of urea application (at planting and two weeks after planting) as a sub-plot. S. macrocarpon was the test crop. Plant fresh weight, P, and S uptake were determined at the first harvest. The results showed that a fertilizer rate of 20 \, \mathrm{kg \, N \, ha^{-1}} produced significantly higher yields and uptake of P and S in the derived savanna ( 4.2 \, \mathrm{t \, ha^{-1}} ) and in the rainforest ( 1.2 \, \mathrm{t \, ha^{-1}} ). Application at two weeks after planting (2 WAP) produced higher yields ( 3.3 \, \mathrm{t \, ha^{-1}} ) in the derived savanna, while the application at planting (AAP) produced the highest yield ( 1.2 \, \mathrm{t \, ha^{-1}} ) in the rainforest. Although the time of fertilizer application did not affect fresh yields and nutrient availability, this study concluded that 60 \, \mathrm{kg \, N \, ha^{-1}} plus 5 \, \mathrm{tons \, ha^{-1}} was the optimum fertilizer combination for S. macrocarpon production in southwest Nigeria.
Comparable studies
Other experimental studies on microdosing, most cited first.
| Study | Year | Design | Participants |
|---|---|---|---|
| Microdosing Clinical Study: Pharmacokinetic, Pharmacogenomic (SLCO2B1), and Interaction (Grapefruit Juice) Profiles of Celiprolol Following the Oral Microdose and Therapeutic Dose Healthy volunteers matched for SLCO2B1 genotype | 2011 | Pharmacokinetic study | n = 30 |
| Microdosing psychedelics has no impact on cognitive function in naturalistic settings Participants during their microdosing regimen | 2023 | Observational within-subjects design | n = 17 |
| PK and PK / PD Modeling of Bcl2 Inhibitor S65487 in Patients With AML and Investigation of Nonlinearity With Microdosing Phase I/II cancer patients and healthy volunteers | 2026 | Pharmacokinetic/pharmacodynamic modeling study | |
| Technical pen-based printhead for high-precision microdosing of personalized therapies. | 2026 | Experimental study | |
| Analysis of Serotonin in Caenorhabditis Elegans Subjected to Micro-Dosing with Psilocybin| Iris Publishers Caenorhabditis elegans | 2025 | Experimental study |