Critical periods and parameters of growth of beet at drop irrigation in Southern Steppe

Abstract

Critical periods and parameters of growth of beet at drop irrigation in Southern SteppeV. Vasiuta, candidate of agricultural sciences Institute of water problems and land-reclamation of NAAS The purpose. To determine critical periods of growth of beet at drop irrigation, to determine the degree of variability of productivity at change of parameters of growth in critical phases using B. Gomperts function. Methods. Field, statistical. Results. Speed of increase in crude mass of beet without fertilization decreases for 50,6%, duration of critical period of growth increases for 0,9 day, productivity of root crops decreases for 46,9% in comparison with variant N90P60K135. Direct correlation link (R=0,99) between variability of parameters of growth in critical points and productivity of root crops is revealed. Conclusions. Modelling of growth of beet using B. Gomperts function and its analysis allow determining parameters of growth in critical points at different factors of influence, and also determining their optimum ratio.Key words: critical periods, critical points, Gomperts function, growth rate, acceleration of growth.Problem statement. The main task of vegetable growing in market conditions is the intensification of production, aimed at increasing productivity, obtaining quality products, rational use of resources to minimize the negative impact on the environment. The yield in the end is the result of biological processes of different nature, the intensity of which is determined by the action and interaction of factors during the vegetation period of plants. As it is known, the violation of optimal conditions of cultivation, in critical periods of plant growth, leads to a decrease in their productivity, and the establishment of growth parameters in these phases, under the influence of regulatory factors, is solved on the basis of the analysis of growth functions [1].This direction of research on drip irrigation, taking into account its distribution in the southern region, is a particularly urgent task, since it allows one to determine the level of variability of plant yields for changes in growth parameters in critical phases, under the influence of regulatory factors, and, accordingly, to determine their optimal ratio.The state of studying the problem. The analysis of publications shows that in order to achieve high productivity, it is very important to maintain optimal conditions of cultivation during critical growth periods, since their violation causes loss of the share of the crop [2][3][4][5]. Determination of anatomical, morphological, physiological and biochemical aspects of growth at the time of critical points reaching plants provides a comparison of the obtained parameters, allows us to more fully disclose the essence of growth processes, establishing the beginning, end, duration of critical growth periods and a number of other indicators for taking into account the influence of regulatory factors [6]. One of the areas of research in growth processes is their modeling of growth functions [8,9], whic...