WAEC Agriculture 2013 Paper

Concept:Plant population per hectare is found by dividing the area of one hectare by the area occupied by one plant.Explanation:Area of one hectare $= 10{,}000\,\text{m}^2$.Each plant occupies an area equal to row spacing $\times$ plant spacing.Given row spacing $= 1.0\,\text{m}$ and required population $= 40{,}000$ plants/ha.Let the required spacing between stands be $x$ metres.$$\text{Plant population/ha} = \frac{10{,}000}{1.0 \times x}$$$$40{,}000 = \frac{10{,}000}{x}$$$$x = \frac{10{,}000}{40{,}000} = 0.25\,\text{m}$$Answer:The spacing between stands should be $0.25\,\text{m}$.