Different researches showed that contamination of heavy metals in soil has become more and more serious, which affects Both soil fertility degradation and detrimental to human health through food chain causing adverse effects on human health. The concentration of metals beyond Maximum Permissible Level (MCL) leads to number of nervous, cardiovascular, renal, neurological impairment as well as bone diseases and several other health disorders and also computed the macronutrient in the human body. Due to these it needs more attention towards the contamination area using either prevention or minimizing methods of the source of contamination. Different researches mentioned different remediation techniques which involve phytoremediation, lime, phosphates, and different biochar materials. Remediation mechanisms basically consist of two fundamental principles. The first is to completely remove contaminations from polluted area and the second is to transform these pollutants to harmless forms. The application of Biochar in soil makes dual purpose which ameliorating soil fertility and remediated heavy metal due to the content of different physicochemical properties. So in this paper, including source of heavy metal, effect of heavy metal in human, plant growth and soil microorganism and remediation technique of contaminated soil, reaction of biochar in soil and application of biochar in soil quality were discussed. Therefore this is particular importance as it indicates the value of biochar as alternative remediation and amendments to ameliorate soil nutrient and acid soils for smallscale farmers who cannot afford to regularly purchase lime and mineral fertilizers as compared to phytoremediation techniques. But phytoremediation wide scope of area use of plants to partially or substantially remediate selected contaminants in contaminated soil, sludge, sediment, groundwater, surface water, and wastewater.

Natural resource constraints in the country have severely hampered agricultural production, putting sustainable agriculture and food security in jeopardy. The farmer, through utilizing viable solutions, plays a critical role in ensuring that food needs of a growing human population are met, which has resulted in a greater reliance on chemical fertilizers for higher productivity. It enhances plant growth and energy, hence ensuring global food security; nevertheless, plants cultivated in this technique do not improve good plant characteristics such as root system, shoot system, nutritional features, and will not have enough time to grow and mature appropriately. Chemically generated plants will collect harmful compounds in the human body, which are extremely toxic. The adverse effects of chemical fertilizers will begin not only with their application on soil, but also with their manufacture, which will produce poisonous compounds or gases such as NH4, CO2, and CH4, among others, which will pollute the air. And when industrial pollutants are dumped into neighbouring water bodies without being cleansed, it pollutes the water it also contains the most alarming consequence of chemical waste accumulation in aquatic bodies, namely, water eutrophication. When used continuously in soil, it destroys soil health and quality, resulting in soil contamination. As a result, it is past time to recognize that this food production input is depleting our ecology and environment. As a result, continuing to use it without taking any remedial measures to minimize or judiciously use it will eventually deplete all natural resources and endanger all life on the planet. Only by adopting new agricultural technical techniques, such as transitioning from chemical intensive agriculture to organic inputs such as biochar, manure, and Nano fertilizers, can the negative effects of synthetic chemicals on human health and the environment be mitigated or eliminated. This would increase fertilizer application efficiency as well as use efficiency. Organic farming will help to maintain a healthy natural environment and ecology for current and future generations.

Soil fertility depletion and the associated soil acidity has a serious problem to crop production in most highland part of Ethiopia Fortunately, this problems can be reclaimed using biochar as soil improvements which can be sequestered in the soil for several years. A pot experiment was conducted to investigate the effects of biochar on soil properties, growth response and nutrient uptake of faba bean. The design employed was a randomized complete block with four replications. The parameters analyzed includes: Trace Metals using DTPA extraction, macronutrient using 1 N ammonium acetate (pH=7) extraction. Dry ashing method was used to determine nutrient uptake of plant samples. The studied soil and plant data were collected, using analysis of variance and treatment means were compared at p value 0.05 probability level using list significant difference test. The results showed that application of biochar significantly improved growth of faba bean and soil nutrient content. The highest values for soil chemical parameters such as available phosphorus and exchangeable cations were obtained from the application of 20 t/h CHB. Similarly, the highest growth performance of faba bean including plant height, leaf number, chlorophyll content, nodulation number, root and shoot biomass, uptake of N, P and K were recorded from biochar-amended soil. From this study, it can be suggested that the application of biochar could be an alternative promising amendment to lime for acid soil management and sustainable crop production. But, further investigations need to be continued under field conditions across different soil and crop types.