AbstractControlling soil erosion is essential in maintaining and sustaining soil and water resources. Soil amendment is recognized to be an efficient approach for erosion limit. So far, very few studies quantified the effectiveness of plant stem juice, a natural by‐product from fibre extraction, as a soil amendment. The purpose of the research was to assess the effect of corn stem juice (CSJ) and grape stem juice (GSJ) on soil aggregation (mean weight diameter [MWD] and water stable aggregate), soil organic carbon, total nitrogen, runoff, and soil loss using a sequence of simulated rains at 60 min 50 mm hr−1, 20 min 25 mm hr−1, 10 min 75 mm hr−1, and 10 min 100 mm hr−1. Both CSJ and GSJ were uniformly applied on the 3 air‐dried soil surface of 0.96‐m2 soil boxes with 2 L of, respectively, 25% and 50% stem juice solution. All stem juice treatments increased soil MWD, water stable aggregate, soil organic carbon, and total nitrogen but reduced runoff and soil loss. CSJ was more effective than GSJ. As for instance, as compared with the control, CSJ increased MWD by 170%, and soil loss decreased from 82% to 95%, whereas GSJ increased MWD by 109–131% and reduced soil loss by 27–36% during the 60 min 50 mm hr−1 rain. The stronger effect of CSJ might have been caused by higher carbon and nutrient contents than those from GSJ. The results also pointed to temporary benefits of stem juice applications, which pointed to the need of reapplying CSJ after a period or targeting application during critical period for soil conservation.
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