The plants differences in biochemical composition are analyzed, and the conservation law of energy value in plants is obtained. The link between the need for the nutrients and the plants biochemical composition is examined, Liebig's law is specified. Keywords: plant's biochemical composition, biochemistry, energy value in plants, plants' nutrition. INTRODUCTION "Global population growth and the increase in the number of starving and malnourished people, changes in dietary habits, and thus the

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... mand increase for food require the significant intensification of the agricultural output. Therefore, the majority of the civilized countries of the world pays special attention to the development of the high-yield farming, the soil fertility recovery and the provision of the high-quality food for the population. Mineral and organic plants fertilizers are one of the boosting factor in farming and plant growing intensification" (Nechaeva and Bykova, 2014) The increase of crops yield capacity is one of the key challenges faced by a mankind. Efficient use of mineral fertilizers is the most crucial factor for the agriculture intensification. It has widely been known that every crop requires its own individual amount of nutrients. International License. Libraries Resource Directory. We are listed under Research Associations category. A. V. Reichardt et al. J Fundam Appl Sci. 2017, 9(2S), 1329-1369 1330 There is a rationale to identify the underlying determinants for the nutrients necessary for the appropriate growth of plants provided the other factors (humidity, temperature, light, etc.) are adequate for the specified yield capacity of the crops. If we refer to the principle from Liebig's law of the minimum and Shelford's law of tolerance which states that with any yield capacity the factors are within the tolerance range, i.e. not higher and not lower the critical levels, then the element content in the plants given further matches the optimal level for the specified yield capacity. Generally, all annual plants contain the same substances: carbohydrates, protein, fats and water, but they are different in the substances' proportions. For a person, the energy value of a plant is of importance, and this value, in its turn, is characterized by the amount of protein, fats and carbohydrates. It is obvious that the plant nutrition depends on its chemical composition, and the solution for the problem is interdisciplinary -biochemistry and agrochemistry. Research First, it is necessary to gather the information and to categorize all plants by their biochemical composition. It is not possible to find the data on the biochemical composition of the plants, that is why certain work was carried out to find the information about the biochemical composition of fruits and the plants' need in nutrients. As the paper describes a wide variety of crops, the fruits are the edible part of a plant (corn, beans, roots, tuberous roots, etc.) Latter calculations show that the average need of soybean in nitrogen leads to the negative result for protein in fruit-free plant weight, that is why for the further calculations, soybean need in nitrogen is supposed to equal the maximum need of 326 gr per 5 kg of yield by the source (Adamenko and Kostyushko, n.d.), which is 62.5 gr per 1 kg of yield. In the initial data the carbohydrate content is supposed to be the person-consumed carbohydrates, therefore for the further calculations it is necessary to know the overall amount of carbohydrates including the undigested fiber. Fiber share of digested carbohydrate weight for all plants is on average 25 %. Keeping it in mind the overall amount of carbohydrates is taken to be 1.25 time more than the amount of digested carbohydrates. To identify the link between the biochemical composition of a plant and the nutrient consumption, it is important to know both the biochemical composition of fruits and the biochemical composition of all fruit-free plant weight. A. V. Reichardt et al.