• S. V. Shevchenko Donetsk Research Station of the Institute of Vegetable and Melon growing of NAAS of Ukraine
Keywords: sweet potato, fertilizer system, nutrients, yield, biochemical composition of tubers


Aim. To further establish the influence of different fertilizer systems on the biometric parameters of plants during the whole growing season, yield and quality of tubers for growing in the Forest Steppe of Ukraine. Methods: field, laboratory and statistical studies. Results. The results of the efficiency of using different types of fertilizers and microbial preparations in the technology of growing sweet potatoes (Ipomoea batatas) in the Forest Steppe of Ukraine were presented. The positive effect of the use of mineral fertilizers on the growth processes of sweet potato plants was proved, especially in the first half of the growing season. With the use of organic fertilizers, an active increase in leaf and stem mass was observed in the second half of the growing season, which was associated with the gradual entry of nutrients into the soil solution with slow mineralization of organic matter. The maximum increase in the area of sweet potato leaves was observed for 40-70 days after planting. In the third decade of June, at the beginning of branching of sweet potato shoots without the use of fertilizers formed a minimum leaf area (1.68 ths. m2/ha). For the use of fertilizers, this figure was 2.75-4.54 ths. m2/ha, depending on the types and doses of fertilizers for sweet potato Slobozhanskyi rubin maximum yield provided the introduction of N370P370K450 in combination with foliar fertilizers "Nutrivant plus universal" (20.65 t/ha). The application of N185P185K225 also had a positive effect, providing a yield of 18.34 t/ha. For the Admiral variety, the maximum level of yield was obtained with the use of organic fertilizers, ash and a complex of microbial preparations (10.45 t/ha). Conclusions. The use of mineral fertilizers has led to an active increase in vegetative and root mass, the area of the leaf apparatus of sweet potato plants throughout the growing season of sweet potato. Intensive development of plant roots in the second half of the growing season and inhibition of leaf-stem mass formation processes were noted for the use of organic fertilizers. Therefore, for the conditions of the Left-Bank Forest-Steppe of Ukraine for intensive sweet potato growing technologies it is better to use the dose of mineral fertilizers N185P185K225, which provides a yield increase of 19.37-19.64 t/ha (12.0-24.7%). For organic production technologies for the variety Slobozhanskyi rubin it is more effective to use 20 t/ha of humus and 1 t/ha of ash, for the variety Admiral - in combination with microbial preparations, which provides a yield increase of tubers at the level of 9.79-10.45 t/ha (30.9-39.7%), respectively.


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