Agricultural utility of sugar mill byproducts:

• Filter cake (also widely known as pressmud) is the precipitated residue obtained during the clarification of sugarcane juice in the Sugar Industry.
• It is rich in organic matter ($25-30\%$), calcium, phosphorus ($1-3\%\,\text{P}_2\text{O}_5$), and micronutrients, making it a valuable organic ameliorant for reclaiming acidic and sodic soils.

Founding of Rothamsted Experimental Station:

• In 1843, Sir John Bennet Lawes (inventor of superphosphate) and chemist Joseph Henry Gilbert founded the Rothamsted Experimental Station in Hertfordshire, England.
• It is the oldest agricultural research station in the world, renowned for long-term classical experiments like the Broadbalk winter wheat trial.

Dominance of quartz in soil coarse fractions:

• Quartz (crystalline silicon dioxide, $\text{SiO}_2$) is chemically inert, lacks cleavage planes, and possesses exceptional hardness (Mohs hardness 7).
• Due to its extreme resistance to physical and chemical weathering, quartz accumulates residually and constitutes $70-90\%$ of the sand and silt fractions in soils globally.