Industrial and applied chemistry

Fertilisers, plant-protection products

The chemistry of supplying plant nutrients and protecting crops, with attention to efficacy, fate and environmental risk.

IntuitionPlants need elements, not a particular brand

Fertilisers supply mineral nutrients that support growth. Nitrogen, phosphorus and potassium are commonly emphasized, but plants also require secondary nutrients and trace elements. The useful dose depends on crop, soil, growth stage and nutrient availability.

SchoolNutrient forms matter

Soil pH, mineral surfaces, organic matter and water influence whether ions remain dissolved, adsorb, precipitate or transform. Formulation therefore interacts with the soil–plant system rather than acting in isolation.

UndergraduateNitrogen transformations in soil

Ammonium can be retained on negatively charged exchange sites, while nitrate is generally more mobile with soil water. Microbes transform nitrogen through mineralization, nitrification and denitrification; these routes affect crop access and losses.

This simplified pathway omits organisms, intermediates and environmental controls. Oxygen, moisture, temperature, carbon availability and pH shape actual rates; nitrous oxide is a potent greenhouse gas, while nitrate can leach to groundwater.

UndergraduateRelease rate and placement

Granule size, coating permeability, dissolution and soil moisture determine when nutrients become available. Controlled-release products aim to align supply with crop demand; actual release varies with temperature and water, so labels and field conditions both matter.

AdvancedCrop protection is chemistry plus ecology

Plant-protection products include herbicides, insecticides and fungicides. Their selectivity depends on exposure, uptake, metabolism and target biology; the same active ingredient can affect non-target organisms if exposure occurs.

Dose, timing, weather, application method and resistance management all influence performance. Integrated pest management combines monitoring, prevention, biological and cultural controls, and carefully selected chemical intervention when justified.

AdvancedTrace the environmental pathway

After application, a compound may be taken up, degrade, bind to soil, volatilize or move in runoff and drainage. Persistence and mobility are separate properties: both, together with toxicity and exposure, help determine risk.

ResearchResearch frontier