Varying inputs to improve profitability of cropping on shallow gravel soils

To assess and demonstrate the benefits of varying fertiliser inputs across a range of productivity zones from a poor performing shallow gravel to a good performing loamy earth.为评估并验证不同肥料投入水平在多组生产力分区中的应用效益，此类分区覆盖从生产力低下的浅砾质土壤到生产力优良的壤质土的范围。