Agrobiological assessment of soybean varieties Glycine max var. Shirofumi on a complex of economically valuable traits for introduction in the conditions of the Forest-Steppe of Ukraine. Selection of promising breeding forms based on morpho-biological and physiological-biochemical characteristics. Methods. Field, laboratory, statistical, computational and analytical. The studies were carried out in the conditions of the educational and production department of Uman National University of Horticulture during 2020-2021, using collection varieties of different ecological and geographical origin (Ukraine, Belarus, Sweden, Japan and Russia). The cultivars were assessed according to the following parameters: plant height, leaf area, net productivity of photosynthesis and indices of individual productivity (weight of beans per plant, number of seeds in a bean, etc.), productivity of green beans and biologically mature seeds and, accordingly, quality indicators of production (dry matter, sugar and protein content). The counts were carried out in the phase of the technical ripeness of the beans. Results. The variability of the "plant height" trait of the studied varieties had an average variation -the coefficient of variation was 22%. The results showed that the standard cultivar 'Romatnyka' and the collection cultivars 'Karikachi' and 'Astra' belong to the semi-determinant type of growth (97-109 cm), cultivar 'Fiskeby V', 'L 380-2-13', 'Fiskeby V-E5', 'SibNIISOKh 6', 'Sac', 'Vesta' belong to the determinant type of growth. According to the number of seeds in the pod, the studied varieties were clearly divided into two groups: with two-seeded beans (varieties 'Karikachi', 'Astra', 'L 380-2-13') and three-seeded beans [varieties 'Romatnyka' (standard), 'Fiskeby V', 'Vesta', 'SibNIISOX 6', 'Sac', 'Fiskeby V-E5']. The maximum yield of edamame beans was produced by varieties 'L 380-2-13' (17.3 t/ha), 'Vesta' (18.8 t/ha), 'Sac' (19.6 t/ha), 'Fiskeby V' (21.4 t/ha), 'Fiskeby V-E5' (22.4 t/ha). A significant differentiation of soybean varieties in the biochemical composition of immature beans was revealed. The dry matter content was 22.70-31.70%. The share of protein in edamame green beans was 28.2-38.6%, in biologically mature seeds its share increased to 36.1-42.8%. Among soluble sugars, the highest concentration was noted for sucrose -7.70-9.38 mg/100 g in dry seeds, what in average amounted to 81.6-86.2% of all sugars. The presented results provide a comprehensive assessment of breeding work on soybean varieties with a low content of oligosaccharides. Conclusions. Evaluation of collection varieties of vegetable soybeans by the variability of morphological traits and productivity made it possible to distinguish 'Sac' variety by a complex of valuable traits for creation of new varieties of vegetable soybeans adapted to the conditions of the Forest-Steppe of Ukraine.
At the present stage, the model of leaf plant development is increasingly considered as the main element of genotypes adaptation to specific cultivation conditions, geographical area, etc. Under these conditions, the potential of the hybrid, the range of its adaptation to environmental conditions is determined by the level of interaction between the development of the assimilation apparatus and the generative organs. An urgent task aimed at improving the productivity of sunflower crop due to the use of genotypes adapted to the conditions of the north-eastern Forest-Steppe and Polyssya of Ukraine is to identify typical schemes of interaction of photosynthetic potential and parameters of plant productivity and crop yields. The studies were conducted in accordance with the program for the development of a variety model for the conditions of the north-eastern Forest-Steppe and Polyssya of Ukraine. Field experiments were carried out in 2016‒2019 at the Sumy National Agrarian University and the Institute of the Agriculture of North East of Ukraine. In the studies, 28‒56 hybrids of different originators were tested annually. Sunflower was cultivated according to the technology recommended for the area, with pre-harvesting density of 60 thousand plants / ha. Harvesting was done manually, from two central rows of a 4-rows plot. The results were processed using the Statistics package. The data on yield indices and values of leaf area coefficient (LAC) of crop for groups of varieties separated by the duration of growing season were analyzed. It was found that the increasing of leaf area was accompanied by an increasing of yield in case of comparing groups with dates of technological maturation until 20 August, 1 September and 10 September. In all cases, the maximum value of the leaf area index ranged from 3.12‒3.52 m2/m2. These dynamics of indicators indicated to the regulatory nature of the values of leaf area coefficient (LAC) of modern sunflower crop and the absence of genotypes (or conditions) capable of maintaining these values at the level of more than 3.3‒3.5 m2/m2. According to the analysis of correlation pleiades, the presence of several levels was found and the relative independence of the relationships between the group of parameters, determining the morphological structure of plants and the vertical structure of crop and the group of parameters, characterizing the content of chlorophyll and its concentration per unit area of leaf surface. In practical terms, the results of the analysis indicated the potential informative nature of the complex use of parameters characterizing the morpho-structure of plants, primarily the index of leaf area and the index of chlorophyll concentration per unit area. In order to isolate the typical schemes characteristic of different levels of adaptation to the conditions of the zone, data on 29 sunflower hybrids distributed in the region were clustered. The results of the analysis allowed to distinguish three significantly different algorithms for the realization of the vegetative and generative potential of sunflower hybrids in the area of the north-eastern Forest-Steppe of Ukraine. It has been established that one of the factors for successful realization of the generative potential of sunflower hybrids in the conditions of the zone is the ability to preserve and (in some cases) to improve the structure of relations between the dynamics and parameters of the plant leaf apparatus and the parameters of their generative development.
The results of experimental studies to determine the actual changes in stem height, plant productivity and sunflower yield depending on the plant density and different variants of retardant application are presented in the article. The research was carried out in a model field experiment with a density gradient from 19.84 to 160.0 thousand plant / ha. The aim of the research was to determine the optimal parameters of the crop structure of new sunflower Choral hybrid in the technology with retardant application. It has been established that the optimal variant for ensuring the technological parameters of the plant height of the Choral hybrid in the northeastern Forest-Steppe of Ukraine was the complex application of Moddus retardant according to the scheme "seed treatment + plant treatment in the phase of 8-10 leaves". To maintain the basic level of yield, it is proposed to increase the calculated indicators of the final (pre-harvest) crop density from 56.5 to 73.1 thousand plants / ha.
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