Gce Model Questions Vol1 2025 Geography Question 40

A farmer has \(120\) ha of land. Two management options are considered over a four‑year period:\n\nOption 1 - Continuous wheat each year. Wheat yields \(3.5\) t/ha and removes \(30\) kg N/ha per season.\n\nOption 2 - A two‑year rotation of wheat followed by soybean, repeated twice. Wheat yields \(3.5\) t/ha (removing \(30\) kg N/ha). Soybean yields \(2.8\) t/ha and fixes \(40\) kg N/ha per season. After each season, 10 % of the soil nitrogen present is lost by leaching. The initial soil nitrogen stock is \(150\) kg N/ha.\n\nFor each option, calculate (a) the average soil nitrogen remaining after the four years, and (b) the total grain production (in tonnes) over the four years. Which option leaves a higher average soil nitrogen and which gives the greater total grain output?