order to accelerate the breeding process, introduced under winter sowing of sugar beets in the agro-climatic conditions of the Right-Bank Forest-Steppe of Ukraine. Taking into account the fact that in the field conditions there is no guarantee of annual wintering of sugar beet plants, in 2016-2018 we studied possibilities of under winter sowing of sugar beet in non-heated SGC. In this case, due to timely irrigation, the optimal seeding period and covering the crops with warming materials before entering the winter is achieved the stable, over the years, wintering of sugar beet plants. It was established that the highest level of preservation of sugar beet plants after wintering (82.2 %) is observed at sowing on the 5th of September and seeding rate of 17 pcs /m. According to these conditions, plants were formed the optimal size and content of dry matter of roots, able to resist to critical temperatures during the wintering. The flowering of sugar beet seedlings occurred in the first decade of June and it was possible to select the best genotypes of sterility (O-type lines) and their CMS analogues in the second decade. The use of this method, by conducting summer crops of sugar beets, makes it possible to accelerate the breeding process for one year for each cycle of selection. In addition, due to energy savings, the material costs of conducting research of this type are significantly reduced.
The studies were conducted on the experimental field of the department of agriculture of the Institute of Agriculture of the North-East on black earth typical of large-dusted-medium-loam on forest species Arable soil layer (0–20 cm) has the following agrochemical parameters: Thurin humus 4.1–4.7 %, pH salt 6,0, water pH 7,9, content of easily hydrolyzed nitrogen according to Cornfield ‒ 11.2, mobile compounds P2O5 and K2O according to Chirikov respectively 11.8 and 10.0 mg per 100 g of soil. Granulometric composition of soil according to Kachinsky large-dust-medium-loam: in the layer of 0‒20 sm of physical clay (particles 0.05–0.01) 49.1–52.1 %, silt (particles less than 0,001 mm) 23.4–25.5 %. The main elements of cultivation technology are generally accepted in the area of the Northeastern Forest-Steppe of Ukraine. Agrotechnical measures were strictly adhered to in a timely manner. The experiment was accompanied by a set of related observations and analytical studies. In the presented work describes the evaluation of ecological cultivation on the level of maturity of domestic corn hybrids from a condition of deficit-free balance of major nutrients. It is established that for such an assessment it is important first of all to determine the level of intensity of each hybrid according to the level of use of such a resource as mineral nutrition. In General, this indicator represents the ratio of the actual and normative level of yield. At the same time for the normative yield adopted calculated by one or another method of its value. Comparison of the actual norms of mineral fertilizers with the number of elements taken out with the harvest was carried out by a special technique, which at the same time allowed to determine the equivalent level of productivity, that is, its value, which corresponds to the deficit-free rate of fertilizers. It should be noted that the existing recommendations on the use of mineral fertilizers take into account the qualitative removal of the main elements of food from the crop, but this is not always consistent with the reaction of the crop to the established norms. In this case, the greater the value FAR the hybrid is characterized, the more efficiently the batteries are used, the more the deficit is formed. The results of studies have shown that the later the level of aging is a hybrid the greater the crop is formed, the greater the equivalent rate of mineral fertilizers should be. Depending on the level of ripeness, the actual deficiency of essential nutrients ranges from 52 to 89 kg/ha. Making practical decisions based on the results of research in each case is determined by the adopted or existing parity between the environmental and economic criteria for growing crops.
The nutrient use efficiency of maize hybrids from the soil or through fertilizers is considered. Cultivation of modern hybrids requires determining the necessary rate of fertilizer to get the planned yield, taking into account their potential productivity and weather conditions. In the absence of data of nutrient uptake for new hybrids, it is proposed to use an indicator of their level of intensity, which is calculated by the ratio of the actual yield and its normative (calculated) value. Studies were conducted in 2018 and 2019 in the fields of the Institute of Agriculture of the Northeast of the National Academy of Agrarian Sciences of Ukraine. Soil – chernozem typical leached (Endocalcis Chernozem). Three maize (Zea mays L.) hybrids of Ukrainian selection were used: Zoryany (FAO 190), Leleka (FAO 260) and Donor (FAO 310). The vegetation seasons 2018-2019 were characterized as very arid (hydrothermal coefficient of Selianinov (HTC) 0.45-0.46). The calculated rate intensity of hybrids on average of two years was 1.07 at sites without fertilizers, and 1.36 at sites with fertilizers (N100 P45 K45). The efficiency of soils N,P,K use increases by application of mineral fertilizers. The nutrients output from the soil: nitrogen ‒ 53.8-71.4 %, phosphorus ‒ 20.0-26.6 % and potassium ‒ 65.4-86.8 %. The relative effect of fertilizers on the yield decreases, therefore, rate of natural fertility in the growth of the crop on fertilized soil increases. Due to the natural fertility of soils, the yield of all hybrids increased by an average of 1.33-1.46 t/ha with N100 P45 K45 applying. The dependence of yield of all maize hybrids on hydrothermal conditions in June was obtained. It was found that, all other things being equal, the yield is directly correlated with the FAO index of the hybrid. The payback of mineral fertilizers is estimated as 0.86-1.14 t / c
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