Productivity Of Various Varieties Of Spring Durum Wheat In The Conditions Of The Central Zone Of Orenburg Region

Spring wheat is one of the most important food grain crops. Hard spring wheat is used to produce cereals, pasta and vermicelli. The grain of this crop contains a lot of protein (14-16%soft, 15-18% hard) and gluten-28-40%. This crop is grown mainly in the following regions: the Volga region, the Southern Urals, Western and Eastern Siberia. Average yields are obtained here due to lack of moisture, but the grain contains a lot of protein and gluten. When growing it in the Non-Chernozem zone, higher yields are obtained, but the quantity and quality of gluten is usually lower. In those regions (the North Caucasus, the Central Asian Republic) where winter wheat yields higher yields, spring wheat is considered one of the insurance products in case of its re-sowing in case of poor wintering.

Physiological and Yield Responses of Spring Wheat Cultivars under Realistic and Acute Levels of Ozone

Tropospheric ozone (O3) is widely recognized as the cause of substantial yield and quality reduction in crops. Most of the previous studies focused on the exposure of wheat cultivars to elevated O3 levels. Our main objectives were to: (i) investigate the consistency of wheat cultivars’ physiological responses across two different realistic O3 levels; and (ii) compare these physiological responses with those under short acute O3 exposure. Three commercially available hard spring wheat cultivars bred under semiarid and Eastern Mediterranean conditions were exposed to two different O3 levels during two consecutive seasons (2016–2018)—36 and 71 ppbv 7 h mean O3 mixing ratios in open-top chambers. The results were compared to those following short acute O3 exposure (102.8 ppbv, 7 h mean for 10 days) in a greenhouse. Non-stomatal responses were significantly more pronounced than stomatal responses in all cultivars under different levels of O3. The specific cultivar was observed as the most O3-tolerant under all experiments. The fact that the same cultivar was found remarkably tolerant to the local semiarid ambient conditions according to other studies and to O3 exposure based on the present study supports a link between cultivar resistance to drought conditions and O3.

PRECURSORS AND NUTRITIENT STATUS EFFECT ON THE YIELD OF HARD SPRING WHEAT IN THE URAL ORENBURG ARID STEPPE

The purpose of the research is the yield increase of spring wheat under arid steppe of the Orenburg pre-Urals con-ditions. Stationary long term field experience was laid on the site of the Kuibyshev's experimental production farm located in Orenburg district. Crop rotations and hard spring wheat monocrop have been studied for 30 years. The two-factor experimental design, consisting of four repetitions was developed. The results of long-term stationary studies for 1990-2019 involving five rotations and hard spring wheat monocrop are presented. Weather conditions, the precursor type and nutrient status are the major factors affecting the hard spring wheat yield. The number of hyperarid years when hard spring wheat yield was less than 5 C per 1 ha in the first rotation amounted to 1 year, in the second – 2, in the third and the fourth – 3 years, in the fifth – 5 years. A significant hard spring wheat increase in yield on the basis of fertilized ground over 30 years was noted on weedfree fallow – 6 years, conservation tillage – 10, green manured – 8, winter – 12, corn – 13 and peas – 4 years, monocrop – 10 years. The highest yield of hard spring wheat for five rotations was on weedfree fallow, conservation tillage and green manured areas (average for two nutrient status), respectively, 11.4, 11.4 and 11.6 C per 1 ha, after winter crops – 10.3 C, corn for silage – 9.3 C, peas – 9.0 C and monocrop – 7.7 C per 1 ha. The yield increase from the fertilized ground was obtained within five rotations respectively for these precursors: 0.4, 0.6, 0.6, 1.0, 0.8, 0.3 and 0.9 C from 1 ha. The research was carried out in accordance with the plan for 2020-2021developed by the Federal State Budgetary Scientific Institution «Federal Scientific Center of Biological Systems and Agrotechnologies of the Russian Acade-my of Sciences» (№ 0761-2019-0003).

Fertilizers influence on grain yield and quality of spring durum wheat in the steppe Volga

The development of modern systems of fertilizers for hard spring wheat assumes full satisfaction of the needs of plants in the macro-and micronutrients, based on a comprehensive assessment of their content in the soil. In this case, the most important theoretical and applied problem is finding the best standards, terms of fertilizer application, taking into account the specific agro-climatic regions. The amount of captured energy depends on the degree of plants development, which in turn is linked with the security of their water, nutrients and warmth, the species affiliation and grade. Nowadays , the most advanced is a method of calculating the balance fertilization rates in various versions. According to this method, fertilizers are calculated for a projected yield based on the requirements of the plants in the mineral elements , their content in the soil , the ratios of their use of soil and fertilizer. This paper presents the results of the geographic location of wheat growth, which is characterized by different climatic and soil conditions , its impact not only on productivity but also on the amount of proteins in grains of durum wheat. Improvement technologies of wheat produced led to significant improving of soil conditions habitat of plants. It is possible, in turn, to spread not only soft, but hard wheat in the more northern regions of the Middle Volga region.