INFLUENCE OF GROWTH REGULATORS AND MINERAL NUTRITION ON NUTRIENT STATUS OF SUNFLOWER
DOI:
https://doi.org/10.31548/dopovidi2018.01.018Keywords:
sunflower, fertilizer, drugs, yield, nutrient status, Khelafit Combi®Abstract
Recently it was proved that the sunflower is an agricultural plant, which compensates taking out the high amount of macro - and micronutrients from the soil by returning them to the soil the waste after the harvesting. Fertilizers have a radical impact on the level of providing plants with mineral elements. But the practice shows that not only the fertilizers solve all the issues related to the optimization of nutrient regime. The technological cycle of the sunflower has the most stressful situations in the early growing season, after herbicide application or during a long drought, when moisture deficit occurs due to high level of temperature. In these cases, it is necessary to treat plants with drugs that minimize the impact of stressful conditions and cause intensive consumption of macro - and micronutrients by plants. We focused our research on all these issues and addressed them this article.
Field studies were taking during 2015 – 2016 on ordinary soils with poor humus in the Dry Steppe zone. The experience was based on two-factor scheme, where factor A was the background of mineral nutrition (a test plot without fertilizer; N30P45; N60P90); and factor B was foliar feeding of sunflower plants by the integrated growth regulating drug Khelafit Combi® (produced by the company “Khelafit”, Ukraine).
The positive effect of the combined drug is always seen in more favorable weather and in climatic conditions of 2016 when the level of the drug influence grew. A double treatment of plants by the drug Khelafit Combi® showed especially significant efficiency. In this case, during the use of the drug, the level of the yield was always higher than the indicator HIP05. On average during two years of field research the double processing plants of the sunflower by the growth regulating drug showed that the increase in yield amount on the non fertilized background was 0,22 t/ha (13,6%); background N30P45 was 0,27 t/ha (14%) and in the background N60P90 was 0,23 t/ha (11,1 percent).
During the analysis it should be noted that the nutrient status of the soil at cultivation of the sunflower can be optimized only when there is the combination of mineral fertilizers with the double treatment of foliar feeding by the multi-combined drug Khelafit Combi®.
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