Effects of Soil Amendment on Soil Physical and Chemical Properties in Oat Field

Abstract

The effect of different soil amendment (potassium polyacrylate; polyacrylamide;potassium humate; potassium polyacrylate+ potassium humate; polyacrylamide+ potassium humate) on soil physical and chemical properties in oat field was studied. The results showed that different soil amendments increase significantly the soil organic matter, available N, available P and available K content by 8.24%-30.22%, 7.60%-19.29%, 5.15%-29.45% and 27.86%-68.86% respectively. Soil water content at 0-60 cm depth is higher with soil amendment. But soil amendment has no effect on the soil water content at 60-100 cm soil depth. At the same time, soil amendments reduce the soil bulk density at 0-10 cm,10-20 cm, 20-40 cm and 40-60 cm depths, and they produce no obvious effect on soil bulk density at 60-100 cm depth. The proportion of > 0.25 mm soil aggregate at 0-10 cm,10-20 cm and 20-40 cm depth is increased significantly by applying soil amendment. Among five aggregate sizes (> 2 mm; 2-1 mm; 1-0.5 mm; 0.5-0.25 mm; 2 mm and 2-1 mm soil aggregates are the most. In conclusion, the mixing use of two kinds of soil amendments(potassium polyacrylate+ potassium humate and polyacrylamide+ potassium humate) is more effective for improving soil physical and chemical properties.