Redroot pigweed (Amaranthus retroflexus L). is a broadleaf weed in autumn crop fields in Russia. Four field experiments were performed in Stalskiy region, southern Russia in two growing seasons, 2016 and 2017, to investigate the effects of postemergence applications of applied alone or in tank mixtures in winter wheat cultivars Tanya and Bagrat. Redroot pigweed control was greatest with tribenuron and all herbicide treatments containing tribenuron. The lowest redroot pigweed control was with aminopyralid/florasulam (study 1) and triasulfuron (study 2), respectively, whereas redroot pigweed had intermediate responses to the other examined herbicides. Tribenuron plus fluroxypyr sprayed on wheat cultivar ‘Tanya’, and tribenuron plus triasulfuron on wheat cultivar ‘Bagrat’ resulted in increased wheat grain yields. Overall, tribenuron and herbicides containing tribenuron provided the most efficient redroot pigweed control compared with the other herbicides and consistently maintained optimal winter wheat yields. Tribenuron could ameliorate redroot resistance to herbicides in wheat fields in southern Russia.

The aim of the study was the determination the effect of foliar application of growth regulator containing Ti (Tytanit®), on Lolium multiflorum morphometry, photosynthetic activity, chlorophyll content and chemical composition of dry matter. A pot experiment was carried out in a plant breeding room of Siedlce University, Poland, in 2019. The experimental units were as follows: I) control – plants sprayed with distilled water; II) plants sprayed with 0.02% Tytanit concentration; III) plants sprayed with 0.04% Tytanit concentration; IV) plants sprayed with 0.06% Tytanit concentration. The following parameters were determined: the shoots number, the number and the length of leaf blades, the length of roots, the dry weight of roots, the dry weight of plants per pot and the content of chlorophyll a and b in leaf blades. In addition, maximum and actual efficiency of the leaf photosystem, photochemical and non- photochemical quenching coefficients and the content of total protein, crude fibre, monosaccharides, crude fat, crude ash, Ca, Mg, P, K and the ratio of K/(Ca + Mg), and Ca/P in the dry matter of plants were determined. Used in controlled conditions, the regulator contributed to the growth of most morphological characteristics, improved photosynthetic activity, increased the concentration of chlorophyll a and b, and

The article is devoted to the establishment, development and activity of the Committee of Oriental Studies of the Polish Academy of Sciences, which has been operating under various names since 1952 and celebrates its 70th anniversary this year. The Committee is the most important institution of Oriental studies in Poland, coordinating and monitoring the development of various fields of this area of science. It also conducts organizational activities (conferences, symposia, conventions) and publishing – among others it is the publisher of the oldest Polish scientific journal in this field, Rocznik Orientalistyczny / Yearbook of Oriental Studies and various publishing series.

A survey was conducted in February of 2004 on the outbreak of stem rot and wilt disease of pepper at the Kitabawa/Danzakara and Ajiwa irrigation sites in Northern Nigeria. Laboratory investigations revealed that it was elicited by Phytophthora capsici Leon. The disease caused severe loss in yield and USD 1 700.00 to USD 3 200.00 loss in revenue/ha. The disease was probably further aggravated by the presence of Fusarium sp. as well as ecto- and endoparasitic nematodes. Reasons for outbreak were elucidated and solutions proffered.

The synthesis problem for optimal control systems in the class of discrete controls is under consideration. The problem is investigated by reducing to a linear programming (LP) problem with consequent use of a dynamic version of the adaptive method of LP. Both perfect and imperfect information on behavior of control system cases are studied. Algorithms for the optimal controller, optimal estimators are described. Results are illustrated by examples.

COVID-19 has been devastating the health of millions of people around the globe and causing untold damage to the economy for many months. Teams of researchers have been working tirelessly on developing an effective vaccine since the outbreak of the pandemic, and we are on the threshold of a breakthrough. However, a large proportion of our society has been expressing concerns about the vaccine. In this statement, we discuss the possible risks and explain why vaccination is the only rational choice which will help us emerge from the pandemic, save the lives and health of countless people and limit the damage already inflicted on the economy.

Academic culture is a set of rules (norms and values) regulating the institution of the university. The central component of academic culture is autonomy both in the sense of independence from external interference and the capacity to decide on research, teaching and organization of the university. Autonomy is endangered by the interference in academic culture of other cultural complexes characteristic for modern society: corporate culture, business culture, bureaucratic culture, financial culture, consumer culture. The resulting cultural clash is the reason for current crisis of the university. The defense of autonomy is the ethical and professional duty of scholars.