Varietal features of photosynthetic activity of Tyumen seed oats when applying mineral fertilizers

The purpose is to study the varietal characteristics of the photosynthetic efficiency of oats when applying fertilizers in Western Siberia. Methods. The research was carried out on an experimental field located in the northern forest-steppe of the Trans-Urals. Photosynthetic potential and net productivity of photosynthesis were determined by the Nichiporovich’s method. Results. The nature of the formation of the assimilation surface and the accumulation of biomass of oat varieties Otrada, Talisman and Foma at different levels of mineral nutrition was studied. The photosynthetic potential and the net productivity of photosynthesis are calculated. The share of the influence of weather conditions, agrophone and variety on the studied indicators is determined. The Foma variety was characterized by maximum leafiness, compared to the Talisman and Otrada. On a natural agrophone, its assimilation surface in the sweeping phase reached 36.0 ± 5.5 thousand m2, at Otrada and Talisman – 28.1 and 24.0 thousand m2 per 1 ha of sowing. A very strong variability of the leaf surface area in Otrada was revealed (Cv = 24 %). The use of mineral fertilizers enhances the development of the leaf apparatus by 44–50 % and causes competition between oat plants. A close positive correlation was revealed between the leaf area in the sweeping phase and yield (r = 0.72). The area of the assimilation surface of oats is affected by: weather conditions – 37 %; nutrition level – 30 % and variety – 25 %. It was found that the Otrada and Foma varieties have the same accumulation dynamics and form the maximum photosynthetic biomass by the sweeping phase. The nature of biomass accumulation depends on weather conditions by 39 %; on mineral fertilizers by 29 % and on the genotype of the variety by 17 %. The productivity of the studied varieties is formed by increasing the assimilation surface, rather than increasing the efficiency of photosynthesis. Scientific novelty. For the first time, the photosynthetic potential was determined and the efficiency of the net photosynthesis productivity of oat varieties of the Tyumen selection was revealed. The share of the influence of various factors in the formation of the oat crop in the conditions of the Northern Trans-Urals has been established.

Formation of photosynthetic parameters of winter wheat crops under foliar fertilization and herbicide application

Purpose. To study agronomic measures for the care of winter wheat: the use of foliar fertilization and protection against weeds with sulfonylureas. Methods. Field and laboratory. Results. It was investigated that the application of Bioforge anti-stress fertilizer did not significantly affect the growth of photosynthetic potential of crops, as the leaf surface area was not significantly different. In addition to the area of the photosynthetic leaf surface, there is a more accurate indicator, that is net productivity of photosynthesis, which can, in our opinion, more accurately show whether the effects of plant protection products against weeds lead to changes in physiological processes in the plant. the mechanism of action of the anti-stress agent is somewhat different. After all, the organization of the photosynthetic apparatus of plants can be such that for a relatively small area of leaves you can get better rates of dry matter accumulation. The best indicators of photosynthetic potential for the use of plant protection products in autumn were identified with the use of such products as Granstar Pro 75, WG, Logran 75, WG, Harmony 75, WG, for introduction into the phenophase BBCH 10–13, and in spring for use in BBCH 27–29 in combination with Bioforge and separately. However, the introduction of PIC 75, WG, to form the best photosynthetic potential of winter wheat crops should be carried out in the phase of BBCH 7–9 in autumn or spring in BBCH 25–26. We also investigated that the use of Bioforge anti-stress fertilizer did not significantly affect the growth of photosynthetic potential of crops. Conclusions. It was determined that the use of the anti-stress agent Bioforge had a positive effect on the condition of plants and their accumulation of dry matter. Accordingly, the best indicators of net productivity of wheat photosynthesis were obtained with the use in autumn of such products as Granstar Pro 75, WG, Logran 75, WG, Harmony 75, WG, for introduction into the phenophase BBCH 10–13, and spring for use in BBCH 27–29 in combination with Bioforge. However, the introduction of PIC 75, WG, to form the best photosynthetic potential of winter wheat crops should be carried out in the phase of BBCH 7–9 in autumn or spring in BBCH 25–26 in combination with Bioforge.

Effect of growth stimulants on yield and quality of grain corn grown in Piedmont subprovince of Dagestan

Field experiments were carried out on chestnut soils of Piedmont Dagestan in 2018-2020. Hybrids of grain corn treated with different growth stimulants were the object of еру research. The experiments showed that the harvesting ripeness of hybrids ROSS 299 MV and Mashuk 355 MV occurred 2...5 days earlier after treatment with growth stimulants compared to the control. The growth stimulants used in the experiment did not have a significant effect on seed germination rate. Among the studied hybrids, the highest seed germination were observed in Mashuk 355 MV hybrid. The highest values of leaf area and net productivity of crops were in hybrid Mashuk 355 MB. Plants treated with growth regulators had higher leaf surface by 4.4% and 5.5%; 6.0 % and 8.4%, respectively. Approximately the same dynamics was recorded for photosynthesis net productivity and accumulation of dry matter. Mashuk 355 MV hybrid showed the best yield, which was 30.5; 31.5 and 32.5% higher respectively, compared to the standard. Productivity of corn hybrids treated with growth regulators increased significantly. The highest data were observed on plants treated with Megamiks N10 growth regulator, which were higher than the control data by 30.0 and 32.5%, respectively. Aminokat 30% growth regulator increased corn productivity by 23.7 and 24.7%, respectively. Sufficiently high indicators of yield structure were 10 recorded in Mashuk 355 MV hybrid in the variant with the Megamiks N10 growth stimulator.

Оценка стимулирующего действия Реглалга в сочетании с микроэлементами у разных сортов сливы

The article presents the results of a study the influence of the bioregulator Reglalg, isolated from the alga Spirogira biomass, in combination with microelements B, Zn, Mn, Mo on the plum plants physiological characteristics. A significant stimulating effect of such treatment on the mass and surface of leaves, the net productivity of photosynthesis and oxidative enzymes activity in the leaves of late local and introduced plum varieties was revealed.

Effectiveness of Weather Based Agromet Advisories on Economics of Farmers in Gaya District of Bihar

Present study was conducted during Summer and Kharif 2020 across villages of Gaya district under the South Alluvial zone of Bihar to assess the usefulness of Agro-met Advisory Services (AAS) and to quantify the economic gain of farmers through adoption of advisory in their day-to-day farming practices. To achieve this, two groups of farmers were formed namely, a group adopting the agro-met advisories (AAS farmers) and other group not aware of agro-met advisories (non-AAS farmers). A total of 80 farmers (including AAS and Non AAS) were identified. The agro-met advisory were circulated among AAS farmers for Summer and Kharif season of 2020 and care was taken for proper implementation of advisories by this group. Expenditure incurred & crop situation of both the group of farmers were compared at every stage from land preparation to harvest and crop growth and yields were monitored regularly among them. Significant results were reported for crop growth and yield among the AAS farmers compared to non-AAS. AAS farmers have obtained a net income of Rs. 45188 and Rs. 37273 while, non AAS farmers obtained a net income of Rs. 26225 and Rs. 28510 for green gram and rice respectively. The AAS farmers reported 41.96 and 23.5 per cent of additional benefit in green gram and rice, respectively. The gain in additional benefit was due to management of crop according to agro-met advisory bulletins. Therefore, adoption of agro-met advisory bulletin based on past, current and future weather forecast is an effective tool for enhancing the net productivity and income.

CO2 uptake decreased and CH4 emissions increased in first two years of peatland seismic line restoration

Oil and gas exploration has resulted in over 300,000 km of linear disturbances known as seismic lines, throughout boreal peatlands across Canada. Sites are left with altered hydrologic and topographic conditions that prevent tree re-establishment. Restoration efforts have concentrated on tree recovery through mechanical mounding to re-create microtopography and support planted tree seedlings to block sightlines and deter predator use, but little is known about the impact of seismic line disturbance or restoration on peatland carbon cycling. This study looked at two mounding treatments and compared carbon dioxide and methane fluxes to untreated lines and natural reference areas in the first two years post-restoration. We found no significant differences in net ecosystem CO2 exchange, but untreated seismic lines were slightly more productive than natural reference areas and mounding treatments. Both restoration treatments increased ecosystem respiration, decreased net productivity by 6–21 gCO2m− 2d− 1, and created areas of increased methane emissions, including an increase in the contribution of ebullition, of up to 2000 mgCH4m− 2d− 1. Further research on this site to assess the longer-term impacts of restoration, as well as application on other sites with varied conditions, will help determine if these restoration practices are effective.

Leaf area index estimation of even-aged oak (Quercus petraea) forests using in situ stand dendrometric parameters

The leaf area index (LAI) is a key characteristic of forest stand aboveground net productivity (ANP), and many methods have been developed to estimate the LAI. However, every method has flaws, e.g., methods may be destructive, require means or time and/or show intrinsic bias and estimation errors. A relationship using basal area (G) and stand age to estimate LAI was proposed by Sonohat et al. (2004). We used literature data in addition to data form measurements campaign made in the northern half of France to build a data set with large ranges of pedoclimatic conditions, stand age and measured LAI. We validated the Sonohat et al. (2004) relationship and attempted to improve or modify it using other stand/dendrometric characteristics that could be predictors of the LAI. The result is a series of three models using the G, age and/or quadratic mean diameter (Dg), and the models were able to estimate the LAI of an oak only even-aged forest stand with good confidence (root mean square error, RMSE < 0.75) While G is the main predictor here, age and Dg could be used conjointly or exclusively given the available data, with variable precision in the estimations. Although these models could not, by construction, relate to the interannual variability of the LAI, they may provide the theoretical LAI of an untouched forest (no meteorological, biotic or anthropogenic perturbation) in recent years. additionally, the use of this model may be more interesting than an LAI measurement campaign, depending on the means to be invested in such a campaign.

Identification of the photosynthetic potential of spring oat varieties in the Lower Volga Re-gion

In 2017-2019, in the agro-climatic conditions of the Lower Volga region, the experience of studying spring oat varieties of different ecological and geographical origin from the world collection of VIR was laid, in order to determine their photosynthetic potential, and to identify varieties with high photosynthetic productivity. Over the years of research, the most adapted varieties of this crop were selected, their photosynthetic potential was determined, and the intensity of photosynthesis during the reproductive period of development (during the main growth phases) of spring oats in the conditions of the Lower Volga region was analyzed. On average, for 3 years of studying the collection varieties of spring oats in terms of the net productivity of photosynthesis, samples were noted: Myrtle, Athlete, Urs guara, Urs penca, p. 1. 3326 It was determined that with the growth of (FP) and (BPF), the yield of oats also increased. Since this indicator directly depends on the physiological and bioclimatic processes occurring in plants during ontogenesis. In the highest yield in 2017, it varied from 0.66 to 2.01 / ha. In 2018, the minimum yield values for all varieties were obtained from 0.51 t / ha of the Dookie 10 variety to 1.78 t / ha of the Mir variety. In the conditions of 2019, the yield variability by variety was from 0.60 t / ha to 1.94 t / ha. Thus, out of the 8 studied varieties, 5 were identified - p.1. 3326, Guara Urs, Urs foam, Athlete, Myrtle, as highly productive, and therefore the most resistant to abiotic stresses of the conditions of the Lower Volga region.

Possible link between Earth’s rotation rate and oxygenation

The biotic and abiotic controls on major shifts in atmospheric oxygen and the persistence of low-oxygen periods over a majority of Earth’s history remain under debate. Explanations of Earth’s stepwise pattern of oxygenation have mostly neglected the effect of changing diel illumination dynamics linked to daylength, which has increased through geological time due to Earth’s rotational deceleration caused by tidal friction. Here we used microsensor measurements and dynamic modelling of interfacial solute fluxes in cyanobacterial mats to investigate the effect of changing daylength on Precambrian benthic ecosystems. Simulated increases in daylength across Earth’s historical range boosted the diel benthic oxygen export, even when the gross photosynthetic production remained constant. This fundamental relationship between net productivity and daylength emerges from the interaction of diffusive mass transfer and diel illumination dynamics, and is amplified by metabolic regulation and microbial behaviour. We found that the resultant daylength-driven surplus organic carbon burial could have shaped the increase in atmospheric oxygen that occurred during the Great and Neoproterozoic Oxidation Events. Our suggested mechanism, which links the coinciding increases in daylength and atmospheric oxygen via enhanced net productivity, reveals a possible contribution of planetary mechanics to the evolution of Earth’s biology and geochemistry.

INFLUENCE OF LIQUID COMPLEX FERTILIZERS AND GROWTH REGULATOR ON PHOTOSYNTHETIC ACTIVITY AND PRODUCTIVITY OF AWNLESS BROME

The article presents experimental material obtained in the conditions of Mordovia on leached black soil on the effect of MEGAMIX liquid complex fertilizers and Albit growth regulator on photosynthesis production process and productivity of awnless brome. Two-factor field experiments were carried out on the crops of awnless brome on an experimental field at OAO “Mordoviyagosplem” in Ozerny village, urban district of Saransk in 2018 - 2020, according to the following scheme: Factor A - Time of application of liquid complex fertilizers and growth regulator. 1 - At the phase of spring growth, 2 - At the phase of stem elongation, 3 - At the phase of spring growth + in the phase of stem elongation. Factor B - Liquid complex fertilizers and growth regulator. 1. - Without application of liquid complex fertilizers and growth regulator (control). 2. - Megamix-pro. 3. - Megamix nitrogen. 4 - Albit. The results of our research indicate that leafiness of awnless brome prevailed (26.0 and 24.4%) when Megamix-pro and Megamix-nitrogen were used at the time of spring growth; predominant leaf area (47.8 thousand m2 / ha), photosynthetic potential (2.31 million m2 • days / ha), dry matter yield (8.75 t / ha) were formed with application of Megamix nitrogen at the time of spring growth; and net productivity of photosynthesis was the highest without application of these preparations (5.8 g / m2 per day) and with spraying the plants with Megamix-profi and Megamix-nitrogen (5.3 g / m2 per day) at the phase of stem elongation. Photosynthesis productivity was the lowest in case application of Megamix-profi and Megamix-nitrogen at the spring growth phase (224 and 228 g of seeds per 1,000 PhP units).