Effect of Humic Acid and Powders of Some Plants Producing Allelopathic Compounds on Soil Properties and Productivity of Faba Bean
Atef Fathy Ahmed *
Biology Department, Faculty of Science, Taif University, Taif, Saudi Arabia. and Soils, Water and Environmental Research Institute, Agricultural Research Center, Giza, Egypt.
Adel Ahmed Fakkar
Weed Research Central Laboratory, Agricultural Research Center, Giza, Egypt.
Abd Elaal Mohamed Abd-El- Kareem
Weed Research Central Laboratory, Agricultural Research Center, Giza, Egypt.
*Author to whom correspondence should be addressed.
Abstract
This investigation was conducted at Shandaweel Agricultural Research Station Sohag Governorate during two successive growing seasons 2015/16 and 2016/17 to study the effect of 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) on soil properties and some physiological aspects in faba bean plants in addition to faba bean yield and broomrape retarding. The results demonstrated that, for all used treatments, a decrease in the bulk density and increase in total porosity, soil infiltration rate and hydraulic conductivity due to the increases in total porosity of the soil. Water holding capacity, field capacity and wilting point also increased, and this improved the hydro-physical properties of the soil. Chemical properties of the soil represented in pH were slightly lowered, while noticeably increased in cation exchange capacity, organic matter and available macronutrients content in the treated soils. Faba bean yield represented in number of pods, weight of pods, seeds weight (g) all / plant and 100-seed weight and seed yield (ardeb /fed) were increased compared to control. Photosynthetic pigments, proteins and carbohydrates contents in shoots and roots were higher in plants grown in the treated soil compared with untreated, while, total free amino acids and proline contents in shoots and roots. The analysis of allelopathic plants powder, sindicated that these plants contains some acids and phenolic compounds in there shoots such as Vanillic, ferulic, syrungic, p-coumaric, p-hydroxypenzoic, caffic and protocatoic acids.
Keywords: Abrupt DNA methylation, Humic acid, Orgin of heterospory, allelopathy, Evolutionary Strategies, soil physical and chemical properties, I. pantil complex., broomrape, faba bean.