The effect of amendment with different rates of biochar on physical and hydrodynamical soil characteristics and in soybean (Glycine max.L) productivity
Abstract
This research was conducted to study the effect of four biochar rates (0-100-300-600 Kg. dunum-1) in soil physical characteristics and soybean productivity growing in a loamy soil.
The study showed a significant decrease in the bulk density of the loamy studied soil in both depths (0-20 and 20-40 cm) with increasing biochar rates compared to the control. Generally, soil total porosity increased significantly in both depths with increasing biochar rates reaching the highest value at a rate of 600 kg. dunum -1 with increments of 7.25% and 9.47% respectively compared to the control.
The pores containing available water (0.2-10 μm) for depth (0-20 cm) rose with increasing biochar supply to 300 and 600 kg. dunum-1 significantly by 2.09%, 4.38% and by 2, 3.58% for depth (20-40cm) in comparison with the control.
Soil’s experimental constants (a and b) increased in both soil depths (0-20 and 20-40cm) with increasing biochar amendment rates causing improvement in waster movement and its absorption by plant. The improvement in soil physical properties caused increasing soybean productivity markedly after biochar supply (100-300-600 kg. dunum-1) by (8.2-25.3-33.85%) as a percentage control respectively.
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