Effects of soil tillage.

To neutralize negative factors (excessive technogenic load, deterioration of water, nutrient regime, and humus state of the soil) and improve the nutritional system of sunflower plants, it is necessary to use more widely mineral, organic, and micronutrient fertilizers, plant growth regulators. Thanks to the regulatory mechanisms of biological products, the development of the leaf surface are enhanced, the main functions are essential for the life of sunflower plants, and they are activated by: membrane processes, cell division, respiration and nutrition, the activity of enzyme systems, photosynthesis, a branched root system with enhanced absorbing capacity is created at the growth period. The main goal of this work was to study the influence of the growth of regulatory substances, different in the direction of action, on the morphogenesis, growth, and development, and productivity of sunflower plants of different ripeness groups in the conditions of the Northern Steppe of Ukraine. Moreover, the determination of the most rational stimulants of the growth of sunflower plants, which ensure the resistance of plants to diseases and adverse environmental factors, optimal growth and development of plants, and contribute to obtaining high and sustainable yields of oilseed crops. The laying and carrying out of field experiments was carried out following the generally accepted methodology of experimental work. The experimental part of the work was performed during 2018–2020 on the scientific and research field of the National Scientific and Research Center of Dnipro State Agrarian and Economic University in the stationary experiment of the Plant Science Department in five-crop rotation pure steam – winter wheat – corn – barley – sunflower to study the effectiveness of modern elements in technologies for growing cereals, legumes, and oilseeds. Scientific studies have established that the formation of the maximum leaf surface area of sunflower was observed using the growth stimulant Tseron (0.5 L/ha) to 70.9–78.1 thousand m/ha, or 5.5–10.2% more for control. Here, sunflower plants formed the largest diameter of the basket – 23–26 cm (11.5–30.4% more than the control), and the maximum number of seeds in 829–951 pcs. The highest weight of 1000 seeds was characteristic of the medium-early hybrid Sumico HTS – 54.0–60.0 g, and the lowest for the medium-late Subaro HTS – 51–55 g, due to the biological characteristics of the hybrids. Plant growth stimulants on sunflower contributed to an increase in crop yields 1.01–1.7 times. The most significant increase in grain for all hybrids was provided by the agent Tseron (0.5 L/ha) – 0.16–0.75 t/ha, or 8.2–43.3%. The application of restricted drugs Tseron (0.5 L/ha) and Architect (0.5 L/ha) contributed to the growth of oil content by 3–8 and 4–6 percentage points.

The influence of biological products on the growth and development of sunflower plants (Helianthus annuus L.) in the northern steppe of Ukraine

The article covers the results of research on the management of elements of technology and the influence of factors on the productivity of sunflower. The field experiment was conducted in the experimental field of IAS NAAS Kirovohrad region. The level of sunflower productivity is determined by the conditions of water and nutrient regimes of soil. According to the results of research it was established that at the time of sowing reserves of available moisture in 0–100 cm of the soil layer were the largest during the first sowing period and amounted to 178.6 mm. Such moisture reserves create favorable conditions for moistening the seed layer of soil to obtain friendly and full seedlings when sowing in the first – second decade of April. The use of moisture by sowing sunflowers can be regulated by sowing dates to some extent. Shifting sowing dates to earlier ones makes it possible to change the conditions of growth and development of sunflower plants, namely, the plants are better provided with moisture, and it is possible to avoid critical temperature periods of plant development. The high reserves of productive moisture for plants in 0–100 cm soil layer, in crops of Forward, LG 56.32, LG 54.85, LG 55.82 hybrids were for plant density of 60 thousand per hectare, at the first sowing period – in the flowering phase they were 127 mm. The content of nutrients the soil changed both over the years and under the influence of different fertilizer backgrounds. Application of nitrogen, phosphorus, potassium fertilizers in the dose of N40P40K40 and N40P40K40 + by-products of the predecessor allows to increase the content of nutrients available to plants in soil and to increase soil fertility. Due to economic indicators, the optimal time of sunflower sowing for hybrids LG 55.82 and LG 54.85 is warming soil at the depth of seed wrapping up to 5–6 °C, for hybrids Forward and LG 56.32 is warming soil at the depth of seed wrapping up to 9–10 °C, optimal density – 60 thousand/ha. In such conditions, the LG 55.82 hybrid formed the highest yield – 3.85 t/ha, LG 54.85 hybrid – 3.64 t/ha, Forward – 3.09 t/ha, LG 56.32 hybrid – 3.62 t/ha.
Key words: sunflower, soil nutrient regime, water regime of soil, yield, profitability, net profit.

Productivity and economic efficiency of growing sunflower depending on the sowing time and plant density in the Right-Bank Steppe of Ukraine

Due to the violation of the technology of sunflower growing in Ukraine and the disbalance of scientifically grounded crop rotation, or their complete absence, with the expansion of sunflower seeds in the structure of crops to 40% and more, and the simplification of the system of basic cultivation of arable land, accompanied by a sharp increase in perturbation of crops by autotrophic and parasitic weeds. To determine the impact of agrotechnical measures, saturation of sunflower seeds, soil tillage systems, and fertilization on the number and species composition of various agrobiological groups of weeds in sunflower crops, including Orobahche cumana Walls. To reduce the herbicide (chemical) loading in agrophytocoenoses of oilseed crops, and ecologization of protection from weeds it was supposed to reveal optimal and environmentally friendly parameters of modern elements of sunflower cultivation technology. The scheme of the experiment included two grains–steam–breeding and grain–seed crop rotations with saturation in the structure of sunflower seeding 12.5%, 20% and 33.3%; three cardinally different systems of basic cultivation of the ground (filed plowing, differentiated and systems of mulching and no-till); two fertilizer systems (no fertilizers + post–harvest residues, N30–60P30–45K30–45 + post–harvest residues). All other elements of agrotechnics were standard and generally accepted for the steppe zone. The accounting of obstinacy was carried out by quantitative–weight and species–specific methods. A tendency has been observed to increase the number of weeds before the first inter–row treatment for mulching and no-till and direct sowing (10.4–15.1 pcs/m 2 ) in 1.3–1.5 times compared with the filed plowing (7, 1–12.4 pc. /m 2 ). At the time of harvesting in comparison with the spring definition, the infestation of oilseed crop under fertilized background decreased by 1.6–4.2 times; and their quantitative values were 2.6–5.2 pcs/m2 (field plowing), 4.1–8.1 (differentiated tillage), 5.5–12.4 pcs/m 2 (no-till), indicating the preservation of regularities inherent in the spring period. It was established that the air–dry weight of weeds (within the limits of individual terms of the definition) varied in versions directly proportional to the change in quantitative values, and on average slightly higher for mulching and no-till (3.8–15.7 g/m 2 ) than filed plowing (1.8–12.3 g/m 2 ). It was proved that the degree of manifestation of the active biological phase of the vaginal parasitism naturally increased with the reduction of the time interval of sunflower return in crop rotation, especially in 3–way crop rotation (33.3% sunflower) – 6.9–12.7%, that is, each sunflower field in the crop rotation – an additional resource for the accumulation of Broomrape in the soil. The increase in the degree of sunflower damage with sunflower wool (up to 11.0–12.7 pcs/100 plants) was observed on the background of deep plowing and decreased with a decrease in the depth of main cultivation in shallow and direct sowing by 6.9–7.8%, or 1.6 times as a result of the localization of the Broomrape in the ground beside the sunflower roots, which provokes its germination with its root secretions, while the seeds of Broomrape for mulching and no-till are located on the top of the soil, soil surface or plant residues, that make impossible its germination in a more dense soil in the absence of the root system of host plant (sunflower). Maximum seed yield (2.35–2.82 t/ha) was obtained in 8–crop rotation at the concentration of sunflower in the seed structure of 12.5%. Extension of the sown area to 25% and 33.3% contributed to a decrease in yields of 2.14–2.67 and 2.10–2.56 t/ha, or 8.9–5.3% and 10.0– 9.2% due to the increase in the degree and intensity of damage to plants by Broomrape. Thus, the expansion in the structure of sunflower crops to 33.3% and the minimization of the main cultivation of the soil leads to an increase in perishability by autotrophic weeds in 1.3–1.5 times, and the degree and intensity of damage by Broomrape, on the contrary, decreases on the finely treated agrofons regarding the localization of seeds in the upper layer of soil or on plant residues, which makes it impossible to germinate.

/pdf/control-of-infestation-and-distribution-of-broomrape-in-51qyeops0o.pdf

Control of infestation and distribution of Broomrape in sunflower crops of Ukrainian Steppe

The article analyzes the operation of the most commonly used dryers for drying sunflowers and other agricultural cereals. Based on the study of drying technology and methods, the advantages and disadvantages of dryers have been analyzed, the results of comparisons of their technical indicators have been presented in tabular form. In the form of a diagram, an analysis of foreign and domestic patent data obtained over the past 10 years for the considered drying devices was presented. The choice of the most suitable installation was carried out on the basis of the compiled analytical table. In order to improve the quality, intensity, efficiency of drying and reduce the cost of the process, recommendations have been developed for a new installation that takes into account the disadvantages of the selected dryer.

https://uzjournals.edu.uz/cgi/viewcontent.cgi?article=1340&context=ijctcm

Reviewing technologies and devices for drying grain and oilseeds

The highest yields of sunflower hybrids are provided when plants are placed after surface plowing and chiseling at a depth of 25-27 cm. Reducing the depth of cultivation to 10-12 cm and direct sowing in untreated soils leads to a significant decline in sunflower yield by 20-30%. An important factor in increasing the crop yield is the use of fertilizers (N40Р60К30), which is better during the basic soil treatment in the autumn or under pre-sowing cultivation, which provides an increase in the yield of seeds at a level of 0,2-0,4 t / ha. High efficiency in the technology of sunflower growing is also provided by the use of physiologically active substances.The yield increasing from their application varies within 0,09-0,32 t / ha or 3,2-10,4%.

Reserves for increasing the yield of sunflower seeds in the ukrainian steppe

The highest control of ragweed (Ambrosia artemisiifolia L.) in the field experiments was provided by the herbicide Primekstra TZ Gold (effect - 83%; dose - 4.5 l/ha), bent sedum (Amaranthus retroflexus L.) with herbicide Mastak (effect - 88%; dose - 0.5 l/ha), chicken millet (Echinochloa crus-galli L.) using the herbicides Varyag and Datonit Gold (effect - 57%, dose - 4.5 and 2.5, respectively), white quinoa (Chenopodium album L.) – herbicide Datonite Gold with surfactant (effect - 85%; dose - 2.5 l/ha). The greatest chemical control was provided by the application options of herbicides Varyag – 4.5 l/ha and Agent – 0.6 l/ha in the phase of 3-5 leaves of the crop in June. This treatment provide the Ponki sorghum hybrid grain yield increase 24-27% compared to the control.

Weed chemical control in grain sorghum at the steppe zone of Ukraine

Topicality. Adhesives are an integral part of the weed control system in the maize crops, because they increase the efficiency of herbicide application. They significantly reduce the cost of plant protection products and increase their efficiency, as well as increase the adhesive properties of the herbicide solution to prevent its runoff and prolong its action. Development of new herbicides, constant weather and climate changes require to study further the effectiveness of the combined action of herbicides and adhesives. Among the adhesives for maize, it is generated interest such products as Synergent SOC, Eco Oil Spray, Esterlip, etc. Purpose. To reveal the effectiveness for combinations of herbicides with adhesives in the maize crops, as well as their impact on plant growth and development. Materials and Methods. The experimental scheme included the following combinations of rimsulfuron with adhesives: 1. Control (Rimsulfuron without adhesive); 2. Rimsulforon (40 g/ha) + Trend 90 (0.15 % working solution); 3. Rimsulforon (40 g/ha) + Synergent (0.15 % working solution); 4. Rimsulforon (40 g/ha) + Eco Oil Spray (0.15 % working solution); 5. Rimsulforon (40 g/ha) + Esterlip (0.15 % working solution); 6. Rimsulforon (35 g/ha) + Esterlip (0.15 % working solution); 7. Rimsulforon (25 g/ha) + Esterlip (0.15 % working solution). Results. The combination of rimsulfuron with adhesive Esterlip had the highest technical efficiency compared to other adhesives, in particular, on the redroot pigweed (Amaranthus retroflexus L.) was 75–100% (complete destruction) and lamb’s quarters (Chenopodium album L.) – 85.7–92.9 %, slightly less on common ragweed (Ambrosia arte-misiifolia L.) – 83.3%. Common purslane (Portulaca oleracea L.) was highly resistant to almost all combinations of rimsulfuron with adhesives. The highest maize yield of 8.99 t/ha was in the variant with Rimsulfuron (40 g/ha) + Esterlip. Reduced application rate of Esterlip to 25–35 g/ha decreased the maize yield to 7.34–7.65 t/ha, or by 1.34–1.65 t/ha (14.9–18.3 %) due to increased weed infestation of crops. The application of adhesives Trend 90, Synergen, Eco Oil Spray also decreased maize yields to 8.48 t/ha, 8.07 t/ha and 8.62 t/ha, respectively, which was less by 0.51 t/ha (5.6 %), 0.92 t/ha (10.2 %) and 0.37 t/ha (4.1 %). The lowest yield was in the control – 5.30 t/ha due to significant weed infestation of grain crops, which decreased by 3.69 t/ha (41.0 %) compared to the best variant (Rimsulfuron (40 g/ha) + Esterlip). Conclusions. Considering the ongoing development of new adhesives and herbicides for maize, as well as climate changes, it is necessary to continue research in this area to determine the most optimal ratio of herbicide rates with adhesives. Key words: maize, weeds, herbicides, adhesives, yield, technical efficiency

/pdf/efficiency-for-combinations-of-rimsulfuron-with-adhesives-in-138tysl1.pdf

Efficiency for combinations of rimsulfuron with adhesives in maize crops


 
 
The study of the properties of disturbed soils and rocks makes it possible to establish the parameters of the natural fertility of the studied substrates, to detect limiting factors, and to determine a set of restoration measures. The tested overburden rocks with the largest stratigraphic share of the open-pit quarries of the Nikopol manganese and Kerch iron ore deposits were loamy-like loess (Quaternary) and grey-green clay (Neogene). There is a certain parametric relationship between texture, density, porosity, the structural and physical state of different models of artificial reclaimed profiles. The composition and properties of rocks of edaphic structures of technosoils differ according to zonal natural and climatic conditions of the subzones of the Ukrainian Steppe. Loess-like loam and grey-green clay of the Kerch iron ore deposit are distinguished by a higher bulk density, lower porosity, and wilting moisture compared to samples from the Nikopol manganese ore basin. The use of the rotor complex leads to mechanical destruction and an increase in the content of small particles of rocks. Self-compacting processes occur to a large extent in multilayer structures. This pattern is observed at the boundary of the backfill differentiated in texture layers of technosoils. This indicates the existence of a barrier that prevents the relationship of edaphic properties between substrata stratums. Optimal ratio of clay minerals provides a rather high capacity of grey-green clay for water absorption. The model of technosoil composed of grey-green clay differs in a larger number of water-resistant micro-aggregates. The best conditions for land reclamation are connected with including grey-green clay in two- and three-layer constructions of technosoils, providing a waterproofing effect. 
 
 


The suitability of physical and chemical properties of rocks for land reclamation in different subzones of the Ukrainian Steppe

At the current weed infestation level of chernozem, it is almost impossible to grow sunflowers without the regulated use of the most effective herbicides with different action spectrum on weeds. It was established that tank mixtures of ethametsulfuron-methyl herbicides (750 g/kg) – 25 g/ha + aclonifen (600 g/l) – 1.2 l/ha + surfactant Trend 90 – 300 ml/ha and ethametsulfuron-methyl (750 g/kg) – 25 g/ha + aclonifen (600 g/l) – 1.5 l/ha + surfactant Trend 90 – 300 ml/ha provided the highest technical efficiency and the lowest air-dry mass of weeds in the oilseed agrocenosis. Their technical efficiency was 61.2–65.8%. Almost all variants of herbicide tank mixtures showed a high phytotoxic effect on green amaranth (Amarantus retroflexus L.) – 51-61%, common ragweed (Ambrosia artemisiifolia) – 52–76%, field bindweed (Convolvulus arvensis) – 100%, yellow foxtail (Setaria pumila L.) was the less controlled – 21– 31%. The variants with the application of herbicide tank mixtures of ethametsulfuron-methyl (750 g/kg) – 25 g/ha + aclonifen (600 g/l) – 1.2 l/ha + surfactant Trend 90 – 300 ml/ha showed the highest indicators of the yield structure elements, here the 1000 seed weight was 73.1 g at a maximum basket diameter of 31.5 cm. These indicators were less in 1.2–1.7 times for other studied variants with the herbicide tank mixtures. When application of the tank mixtures of ethametsulfuron-methyl (750 g/kg) – 25 g/ha + aclonifen (600 g/l) – 1.2 l/ha + surfactant Trend 90 – 300 ml / ha and ethametsulfuron -methyl (750 g/kg) – 25 g/ha + aclonifen (600 g/l) – 1.5 l/ha + surfactant Trend 90 – 300 ml/ha, it was obtained the maximum yield of sunflower seeds 2.15 and 2.07 t/ha, respectively. Other variants with herbicides and their tank mixtures had significantly lower yield of sunflower seeds – by 23–27 %. Key words: sunflower, weeds, herbicides, tank mixes, yield, technical efficiency

/pdf/technical-efficiency-of-herbicide-tank-mixtures-under-23nooas4.pdf

Technical efficiency of herbicide tank mixtures under sunflower cultivation in the northern Steppe of Ukraine

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