Effect of Humic Acid and Powders of Some Plants Producing Allelopathic Compounds on Soil Properties

Using humic acid (200 mg kg-1 soil), powder of some plants for producing allelopathic compounds (powder at rate 10 gm kg-1 soil of Datura stramonium, Euphorbia geniculata, Trifolium, alexandrinum), and humic acid (200 mg kg-1 soil) during two consecutive growing seasons 2015/16 and 2016/17 at Shandaweel Agricultural Research Station Sohag Governorate to study the impact of using humic acid. The results showed that changes in total porosity of the soil resulted in a decrease in bulk density and an increase in total porosity, soil penetration rate, and hydraulic conductivity for all used treatments. The hydro-physical properties of the soil improved as the water holding size, field capacity, and wilting point increased. Chemical properties of the soil, as measured by pH, were marginally reduced, while cation exchange capability, organic matter, and usable macronutrients content in the treated soils increased significantly.When compared to control, faba bean yield was higher in terms of number of pods, weight of pods, seeds weight (g) all / plant, and 100-seed weight and seed yield (ardeb /fed). Plants grown in treated soil had higher levels of photosynthetic pigments, proteins, and carbohydrates in their shoots and roots than those grown in untreated soil, while total free amino acids and proline levels in shoots and roots were lower. Allelopathic plants produce acids and phenolic compounds such as Vanillic, ferulic, syrungic, p-coumaric, p-hydroxypenzoic, caffic, and protocatoic acids, according to a study of their powder.

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