Abstract
The purpose of this research is a comparative analysis of the chlorophyll content in two varieties of winter wheat in different periods of plant development using an autonomous field device (N-tester) for operational measurement of nitrogen content and calculation of the optimal dose of nutrient application on winter wheat crops during different phases of vegetation. Methods and materials. The research was conducted in the Oleksandrivskyi and Bobrynetskyi districts of Kirovohrad region on the fields of two farms on winter wheat crops (varieties «Memory» and «Avenue») with selected control plots with an area of 3 m2 each. At the key moments of plant development, before applying fertilizers, chlorophyll was measured using the N-tester «CSM-200 Plus GPS» and the sugar content was measured with a refractometer «HT116ATC», after which the required dose of application of drugs was calculated. In both farms, fertilizing was carried out at the optimal time of fertilizer application, but the rates of fertilizer were radically different. Results. Wheat of the «Memory» variety in the control plot (the total amount of applied nitrogen was 198 kg/ha), starting from the earing phase, looked greener, taller, the ear had a larger size, the indicators of the N-tester and the content of sugars in the control plot had higher indicators, but also the ripening period in the control plot lasted longer than in the rest of the field (the total amount of applied nitrogen per year was 101 kg/ha). Winter wheat of the «Avenue» variety in terms of the main indicators in the control plot (the total amount of applied nitrogen 145 kg/ha) and in the field (the total amount of applied nitrogen 183 kg/ha) almost did not differ: the length of the ear, the height of the plant, and the color are the same, the indicators of the N-tester and the content of sugars are also almost the same. Therefore, it can be concluded that the introduction of an additional amount of 38 kg/ha per year was ineffective and did not increase productivity. Conclusions. Operational measurement of the nitrogen content in field conditions using the N-tester made it possible to effectively calculate the doses of nutrients applied to winter wheat crops during different phases of vegetation and contributed to increasing the yield level of the investigated crop varieties. Keywords: fertilizers, plant nutrition, winter wheat, refractometer, harvest, phases of plant development, chlorophyll, N-tester.
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