Carbon fiber is composed of carbon atoms bonded together to form a long chain. The fibers are extremely stiff, strong, and light, and are used in many processes to create excellent building materials. Carbon fiber material comes in a variety of "raw" building-blocks, including yarns, uni-directional, weaves, braids, and several others, which are in turn used to create composite parts. The properties of a carbon fiber part are close to that of steel and the weight is close to that of plastic. Thus the strength to weight ratio (as well as stiffness to weight ratio) of a carbon fiber part is much higher than either steel or plastic. Carbon fiber is extremely strong. It is typical in engineering to measure the benefit of a material in terms of strength to weight ratio and stiffness to weight ratio, particularly in structural design, where added weight may translate into increased lifecycle costs or unsatisfactory performance.

Many studies have been made in recent years to improve the quality and increase the quantity of agricultural yield. Mechanization and novel hybrid seeds are not the only factors contributing to agricultural advancement and progress; soil quality also plays an important role. It is common for soils that lack organic matter to be unfit for plant growth. Humic compounds have begun to be added to soil in different regions of the world to address this issue and boost agricultural yields. Nowadays, humic acid (HA) is available in different forms (powder, granule, liquid & flakes) in the market and can be applied to crops or soil by various techniques, i.e. soil application, foliar application, seed treatment, root dipping, through drip irrigation and along with inorganic fertilizers but soil application is found most effective in numerous studies. To know the optimum dose of the humic acid, various studies were conducted on crops and discovered a positive response in yield attributed to character, yield, and soil properties. This review enlightens the relevance of humic acid on different crops and soil health, and boosts agricultural productivity.

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Soybean (Glycine max (L.) Merrill) [2n = 40] is popularly known as "Miracle Crop or Golden Bean" owing to its multifaceted uses and nutraceutical properties. Among the important diseases adversely affecting the soybean cultivation, the crop is very much susceptible to whitefly (Bemisia tabaci Gen.) transmitted yellow mosaic disease (YMD). It is more serious and widespread disease of soybean in the Northern and Central India and Pantnagar is considered as a hotspot for YMD. Understanding of weather factors and their role in disease incidence is a prerequisite for developing disease forewarning system (Amrate et al., 2021). Hence, a detailed investigation was undertaken to study the influence of weather parameters on the incidence of YMD and differential response of the soybean genotypes varying in YMD resistance under varying agro-climatic conditions. from 0.59 to 0.79 (Meti and Kenganal, 2017).