Influence of various elements of cultivation technology on the chlorophyll content in winter wheat plants and its yield

Abstract

Abstract. The chlorophyll content is the most important factor that determines the intensity of photosynthesis and the overall biological productivity of plants. Therefore, the search for mechanisms that allow you to manage the production process is an important task, the solution of which will allow you to improve the technological methods of growing crops to obtain high yields. The purpose of the study is to determine the influence of various elements of cultivation technology on the chlorophyll content in plants and the yield of winter wheat. Methods. The objects of research were winter wheat crops of various varieties. The chlorophyll content was determined by the method of Ya. I. Milaeva and N. P. Primak. Crop accounting was performed using the combine method. Results. The relative chlorophyll content in winter wheat plants: lea predecessor on average 9,4 % higher than for cereals; the use of mineral fertilizers in a few increased this figure by 38,0 %, wheat ‒ 14,0 %; in the later sowing time the amount of green pigments in plants on average more than early and optimum of 10,5 and 4,0 %, respectively; in more thickened crops, the chlorophyll content in plants is lower than in sparse ones (by 13,0 %). The absolute chlorophyll content (g/m2) in winter wheat plants: in a few in an average of 45,0 % higher than for cereals; the use of mineral fertilizers in a few increased this figure at 73,4 %, for winter wheat ‒ 76,8 %; number of green pigments in plants at the optimum sowing time is on average higher than in the early (29,6 %) and late (15,2 %); at the optimal seeding rate accumulates more chlorophyll than the minimum (by 33,4 %) and the maximum (24,2 %). On average, for all cultivation technologies, the variety Stat' contains the largest amount of chlorophyll in plants, and Zustrich – the smallest. The yield of winter wheat for the lea precursor was 4,9 t/ha, for winter wheat – 3,3 t/ha. Use of mineral fertilizers on couple increased this indicator on average by 44,1 %, and on the cereal predecessor ‒ by 55,3 %. At the optimal time of sowing, the highest yield was formed, and on average it was 5,1 t/ha for varieties. seeding Rates did not have provable differences on the yield of winter wheat. The highest yield was obtained in the Rate variety on the predecessor of pairs on a fertilized background – 7,5 t/ha. Scientific novelty. The features of the influence of various precursors, the level of mineral nutrition, timing and seeding rates on the content of chlorophyll in plants and the yield of winter wheat crops of new varieties of selection of the North Caucasian FSAC were revealed. The correlation between the relative and absolute content of chlorophyll in winter wheat plants and its yield for these varieties in the zone of unstable moisture in the Stavropol territory was determined.

Estimation of Winter Wheat SPAD Values Based on UAV Multispectral Remote Sensing

“…The CFS algorithm is a filter algorithm based on correlation. The assessment of the correlation between features and categories, as well as between features themselves, was performed using the coefficient Merit S explicated in Equation (1), enabling data cleaning. The key aspect of CFS is the heuristic evaluation of the value of feature subsets, which is achieved by calculating symmetric uncertainty (SU) explicated in Equation ( 2) to measure the correlation within the feature subset [54].…”

“…Chlorophyll, as the primary pigment involved in photosynthesis, plays a crucial role in crop growth and nitrogen utilization efficiency by capturing sunlight energy. Chlorophyll content changes impact crops' growth status and nitrogen utilization efficiency directly [1]. The green-up stage corresponds to Zadoks scale stages 25-30 [2], which is the second peak of tillering in wheat, during which the number of tillers increases by 30-40%.…”

Prediction of Chlorophyll Content in Multi-Temporal Winter Wheat Based on Multispectral and Machine Learning

“…Soil plant analysis development (SPAD) can directly reflect the relative chlorophyll content in leaves (Netto et al, 2005 ), which was the most important pigment in photosynthesis, and its content was intimately related to the photosynthesis of plants (Zhang et al, 2019a ) and the changes in its concentration directly affected the health of crops (Gitelson, 2005 ; Shestakova et al, 2020 ). Winter wheat was one of the world's major food crops.…”