Influence of agricultural technology elements on nitrogen nutrition of winter wheat

Abstract

The purpose of our research is to study the influence of the main elements of cultivation technology on the nitrogen nutrition of winter wheat plants of varieties selected by THE North Caucasus Federal RESEARCH center (Mikhailovsk, Stavropol territory), as well as to establish the possibility of assessing the nitrogen content based on remote sensing data. Methods. The field experiment was performed in accordance with the guidelines of B. A. Dospekhov. The nitrogen content was determined by the method of V. T. Kurkaev and co-authors. NDVI data was obtained using a Greenseeker hand-held scanner (Trimble). Found that the use of mineral fertilizers in technology of winter wheat cultivation increases the relative content of nitrogen in plants at the end of generative period by 30.7-61.3% as at the predecessor pairs and 12-52,5 % for the predecessor winter wheat. The highest nitrogen content in plants was observed at the seeding rate of 4 million/ha (the excess compared to 5 and 6 million/ha is 4.3-19 %). The influence of seeding dates and norms on the relative nitrogen content is not always unambiguous and depends on the conditions of a particular year. Among the varieties, Anisimovka shows high nitrogen content. During the earing phase, there is a direct correlation between the NDVI of winter wheat crops and the relative nitrogen content in plants, the correlation coefficient on average over the years of the study is 0.72. The scientific novelty of the study is that for the first time for the zone of unstable humidification of the Stavropol territory, the influence of elements of cultivation technology on the features of nitrogen nutrition of plants of new varieties of winter wheat was analyzed, and a correlation was established between the nitrogen content in the earing phase and the NDVI index.