Results and analysis Nutrient distribution of terrace topsoil in Weibei dry-land Nutrient distribution of terrace topsoil at different years on different orientations Available potassium, available phosphorus, total nitrogen, and active organic carbon all show an increasing trend with the increase in the year of soil formation (Fig. 2 ).
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Nutrient accumulation and fertilizer potential of terrace section soils in loess areas.
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