Influence of the method of sowing and seeding rate on the yield of alfalfa in the south of Belarus

2020 ◽  
Author(s):  
Ol'ga Ptashec ◽  
Lyudmila Luchenok
Keyword(s):  
Medicago Sativa ◽  
The South ◽  
Seeding Rate ◽  
Peat Soils ◽  
Positive Correlation ◽  
Green Mass ◽  
Grass Stand

The results of studies on the influence of agrotechnological techniques on the productivity of alfalfa (Medicago sativa), cultivation on agro-peat soils in the south of Belarus were presented. It was established that the yield of green mass on average over 4 years of life was 393.6–517.9 c / ha when sown under cover and 494.3–629.8 centners ha-1 with coverless sowing. Productivity — 56.5–75.1 and 69.5–89.7 centners ha-1, respectively. A positive correlation between the increase in the yield and productivity of the grass stand with an rise in the seeding rate and doses of fertilizers applied was noted.

Optimal set of technological techniques for lucerne yellow-flowered cultivation in southern Belarus

2020 ◽  
Author(s):  
Lyudmila Luchenok ◽  
Aleksandr Yuzupanov
Keyword(s):  
Peat Soils ◽  
Green Mass ◽  
Optimal Set

The data on the yield of lucerne (Medicago falcate) when cultivated on agro-peat soils in the conditions of southern Belarus was presented. It has been established that the yield of green mass in 4 years of life averaged 422.9 centner per ha at sowing under cover and 472.4 centner per ha at bloodless sowing. Productivity — 57.7 and 68.2 centner feed units ha–1 respectively. A small level of response to the application of various technological techniques was noted.

AN ADAPTABILITY POTENTIAL ANALYSIS OF THE VICIA SATIVA VARIETIES ON THE GREEN MASS YIELD IN THE SOUTH EASTERN ZONE OF THE KAMCHATKA TERRITORY CONDITIONS

1970 ◽  
pp. 33-37
Author(s):  
А. А. Zhdanova ◽  
М. B. Kochneva
Keyword(s):  
Total Yield ◽  
Vicia Sativa ◽  
Thermal Coefficient ◽  
The South ◽  
Hydrothermal Conditions ◽  
Environmental Index ◽  
Limit Values ◽  
South Eastern ◽  
Green Mass ◽  
Eastern Zone

The article presents the results of a four-year collection study of promising varieties of spring-sown vetch, Vicia sativa L., for zoning in the conditions of the south-eastern zone of the Kamchatka Territory according to statistical parameters. The aim of the study was to identify stress-resistant, environmentally plastic, stable and adaptive varieties of vetch seed calculated by the yield of green mass. The experimental field of the Kamchatka Research Institute of Agriculture is located in the area of the Pacific influence with a cold summer without a dry season. Hydrothermal conditions during the periods of green mass formation in 2014-2017 were characterized by excessive moisture content, hydrothermal coefficient = 2.0-4.6. The environmental index ranged from -12.08 to 13.2. The correlation analysis revealed a direct relationship between the total yield and the sum of active temperatures, r = 0.9. An inverse correlation was determined between the environmental conditions index and the hydro-thermal coefficient, r = -0.79. The average annual yield of green mass for 4 years was 18.7 t/ha. The level of the average yield of green mass varied from 10.0 to 26.8 t/ha, the limit values varied within 5.5-34 t/ha. In the course of work, 18 varieties of spring vetch were studied, of which 5 valuable varieties were identified for cultivation in the region: Lyudmila (Yср = 26.8 t/ha), Yubilejnaya 110 (25.5), Uzunovskaya 91 (22.8), Tayozhnaya (21.8) and the zoned variety Lugovskaya 85 (18.0 t/ha), capable of producing stable yields in favorable and extreme conditions.

Establishment and productivity of cicer milkvetch (Astragalus cicer L.) in alfalfa (Medicago sativa L.) or alfalfa- hybrid bromegrass mixtures

2021 ◽  
Author(s):  
Allan Foster ◽  
Bill Biligetu
Keyword(s):  
Medicago Sativa ◽  
Aqueous Extract ◽  
Nutritive Value ◽  
Forage Yield ◽  
Allelopathic Effect ◽  
Limited Information ◽  
Seeding Rate ◽  
Bromus Riparius ◽  
Medicago Sativa L ◽  
Astragalus Cicer

Cicer milkvetch (Astragalus cicer L.) (CMV) is a non-bloating, perennial legume that has shown persistence under grazing. Limited information is available on its seedling establishment and subsequent forage yield and nutritive value in alfalfa (Medicago sativa L.) mixtures. Field plots were seeded in May 2013 at Melfort, SK, Canada to evaluate ‘Oxley II’ cicer milkvetch performance in ‘AC Grazeland’ alfalfa or alfalfa and ‘AC Success’ hybrid bromegrass (Bromus riparius × B. inermis) mixtures from 2014 to 2017. Two controlled environment tests were also conducted by treating seeds of CMV using alfalfa root aqueous extract. Seed germination and seedling height of CMV were significantly reduced in aqueous extract. In field, establishment of CMV in a mixture containing alfalfa was reduced, and CMV dry matter proportion in the mixture increased only 3.5% over three years. Increasing CMV seeding rate did not increase its DM percent in the mixtures, indicating a high allelopathic effect of alfalfa. Forage DM yield of all mixtures was linearly correlated to the proportion of alfalfa, and adding hybrid brome did not increase the DM yield. Forage DM yield was higher for the three-cut than the two-cut treatments for CMV-alfalfa mixtures, but there was no difference between the cutting frequency for CMV-alfalfa- hybrid brome mixtures. Fiber concentrations decreased linearly with increased CMV seeding rate in the mixtures. This study showed CMV establishment in alfalfa mixtures was reduced in a same row seeding, and the allelopathic effect was not reduced by lower alfalfa seeding rates or adding a grass.

Alfalfa (Medicago sativa)–Cheat (Bromus secalinus) Competition

Weed Science ◽  
1984 ◽  
Vol 32 (6) ◽  
pp. 751-756 ◽  
Author(s):  
David R. Pike ◽  
Jimmy F. Stritzke
Keyword(s):  
Medicago Sativa ◽  
Total Protein ◽  
Forage Quality ◽  
Protein Yield ◽  
Seeding Rate ◽  
Yield And Quality ◽  
Bromus Secalinus ◽  
Three Stages

A study was conducted at two locations to evaluate the effects of cheat (Bromus secalinusL. ♯3BROSE) competition on four seeding rates (4.5, 9.0, 13.5, and 22 kg/ha) of alfalfa (Medicago sativaL. ‘Riley’). Three stages of first harvest (early bud, early bloom, and late bloom) were imposed on fall-planted alfalfa, with and without cheat overseeding, to determine the effects of harvest stage on alfalfa yield and quality. Cheat infestations significantly decreased alfalfa production and forage quality. Increasing the seeding rate of alfalfa only partially offset these losses. Harvesting early helped minimize the effect of cheat competition. First-harvest protein yield of forage was significantly decreased by, cheat overseeding. Total protein yield at first harvest was not affected by cutting stage but did increase with the two higher seeding rates of alfalfa.

scholarly journals Land cover change dominates decadal trends of biogenic volatile organic compound (BVOC) emission in China

2020 ◽  
Author(s):  
Hui Wang ◽  
Qizhong Wu ◽  
Alex B. Guenther ◽  
Xiaochun Yang ◽  
Lanning Wang ◽  
...  
Keyword(s):  
Land Cover ◽  
Land Cover Change ◽  
Correlation Coefficients ◽  
Anthropogenic Sources ◽  
The South ◽  
High Positive Correlation ◽  
Positive Correlation ◽  
Isoprene Emission ◽  
Increasing Trends ◽  
The Impact

Abstract. Satellite observations reveal that China has been leading the global greening trend in the past two decades. We assessed the impact of land cover change on total BVOC emission in China during 2001–2016 and found a significant increasing trend of 1.09 % yr−1 with increases of 1.35, 1.25 and 1.43 % yr−1 for isoprene, monoterpenes and sesquiterpenes, respectively. Comparison of different scenarios showed that vegetation change is the main driver of BVOC emission change in China. Considerable heterogeneity was observed on regional scales, with the highest increasing trends of BVOC emission found in the Qinling Mountains and in the south of China. The BVOC emission for the year 2016 in these two regions was enhanced by 61.89 and 67.64 % compared to that of 2001, respectively. We compared the long-term HCHO vertical columns (VC) from the satellite-based Ozone Monitoring Instrument (OMI) with the estimation of isoprene emission in summer. The results showed statistically significant positive correlation coefficients over the regions with high vegetation cover fractions. In addition, the isoprene emission and HCHO VC both showed statistically significant increasing trends in the south of China where these two variables have high positive correlation coefficients. This result supports our estimation of the variability and trends of BVOC emission in China. Although anthropogenic sources comprise ∼63 % NMVOC emissions in China, the continued increase of BVOC will enhance the importance of considering BVOC when making policies for controlling ozone pollution in China along with ongoing efforts to reduce anthropogenic emissions.

RAPD polymorphism in the prebreeding material for cultivation of synthetic variations of lucerne (Medicago sativa L.)

2013 ◽  
Vol 8 (1) ◽  
pp. 38-47 ◽  
Author(s):  
Lidia Skuza ◽  
Stanisława Rogalska ◽  
Stanisław Dyba ◽  
Jan Bocianowski
Keyword(s):  
Medicago Sativa ◽  
Genetic Similarity ◽  
Seed Set ◽  
Inbred Lines ◽  
Specific Yield ◽  
Group Method ◽  
Green Mass ◽  
Molecular Image ◽  
Synthetic Population ◽  
Medicago Sativa L

AbstractGenetic diversity between synthetic cultivars (Syn5, Syn7), inbred lines (D3, D5, E1/2, G1/1, G1/2) and ecotypes (E16, E51, E182, E231) of lucerne (Medicago sativa L.) was studied using the RAPD-PCR method. The plants differed in the efficiency of seed set and in the yield of green mass. The ecotypes E182 and E231 and the synthetic population Syn5 showed the highest fertility. Additionally, Syn5 also showed the highest efficiency of seed set and the yield of green mass. Among the inbred lines, D3 was characterised by the highest yield of green mass and E1/2 by the highest fertility. An optimal combination of yield and biomass was observed for the synthetic population Syn5, obtained by crossing the lines D3, D5 and G1/1, as demonstrated using comparative analysis. A total of 338 polymorphic products were generated using 20 arbitrary primers. Cluster analysis using the Unweighted-Pair Group Method with Arithmetic Mean (UPGMA) in the Molecular image Gel Doc™ XR (Bio-Rad) software based on the Dice’s coefficient of genetic similarity showed a division of the studied forms into two groups based on genetic similarity. The ecotype E16 formed one of the groups whereas all of the other ecotypes observed in this study clustered into the second group. A high level of polymorphism among the studied lucerne forms was detected indicating an interesting gene pool awaiting future exploration. Analysis of variance also supported a high diversity among the studied forms. This study provides insightful information into the heterosis effect of synthetic populations or hybrids of F1 lucerine by providing correlations between the genetic background of the inbred lines and their ability to produce a specific yield.

Abbreviata (Nematoda: Physalopteroidea) in Lizards of the Varanus Gouldii Complex (Varanidae) in Western Australia.

1983 ◽  
Vol 31 (2) ◽  
pp. 285 ◽  
Author(s):  
HI Jones
Keyword(s):  
Immune Response ◽  
Western Australia ◽  
Host Immune Response ◽  
The State ◽  
Stomach Wall ◽  
Host Size ◽  
The South ◽  
Positive Correlation ◽  
South West

Six species of nematode in the genus Abbreviata were recovered from the stomachs of 58 Varanus gouldii, s.l., in Western Australia: A. hastaspicula, A. barrowi, A, antarctica, A. levicauda, sp. nov., A. tumidocapitis, sp. nov., and an unnamed species. A. occidentalis Jones, 1978 is reduced to synonomy with A. antarctica (Linstow, 1899). A, hastaspicula was recovered from all hosts examined except those from the south-west of the State, where it was replaced by A. antarctica. A. levicauda and A. tumidocapitis occurred concurrently with one or both of the above species. Th'e increase in A. hastaspicula numbers with host size in V. gouldii, s.s., (P<0,05) and in V. panoptes (P<0,05) indicates that there is no effective host immune response. A. hastaspicula numbers were unaffected by concurrent A. levicauda infection. There was a positive correlation between numbers of Abbreviata sp. larvae and A. hastaspicula (P<0.01), and between Abbreviata sp. larvae and A. antarctica (P<0.01), in V. gouldii, s.s. No larvae were seen in the stomach wall of these Varanus, and it is concluded that those which occur commonly in this situation in elapid snakes are probably larvae of A. hastaspicula or A. levicauda, which appear to be unable to mature in these hosts.

scholarly journals Modern calibration of <i>Poa flabellata</i> (Tussac grass) as a new paleoclimate proxy in the South Atlantic

2020 ◽  
Author(s):  
Dulcinea V. Groff ◽  
David G. Williams ◽  
Jacquelyn L. Gill
Keyword(s):  
Relative Humidity ◽  
Isotopic Composition ◽  
Isotope Composition ◽  
Regional Climate ◽  
South Atlantic ◽  
Falkland Islands ◽  
Global Changes ◽  
The South ◽  
Positive Correlation ◽  
Paleoclimate Records

Abstract. Terrestrial paleoclimate records are rare in the South Atlantic, limiting opportunities to provide a prehistoric context for current global changes. The tussock grass, Poa flabellata, grows abundantly along the coasts of the Falkland Islands and other sub-Antarctic islands. It forms extensive peat records, providing a promising opportunity to reconstruct high-resolution regional climate records. The isotopic composition of leaf and root tissues deposited in these peats has the potential to record variation in precipitation, temperature, and relative humidity over time, but these relationships are unknown for P. flabellata. Here, we investigate the isotopic composition of P. flabellata plants and precipitation and explore seasonal relationships with temperature and humidity across 4 study locations in the Falkland Islands. We reveal that inter-seasonal differences in carbon and oxygen stable isotopes of leaf α-cellulose of living P. flabellata significantly correlated with monthly mean temperature and relative humidity. The carbon isotope composition of leaf α-cellulose (δ13Cleaf) records the balance of CO2 supply through stomata and the demand by photosynthesis. The positive correlation between δ13Cleaf and temperature and negative correlation between between δ13Cleaf and relative humidity suggest that photosynthetic demand for CO2 relative to stomatal supply is enhanced when conditions are warm and dry. Further, the positive correlation between δ13Cleaf and δ18Oleaf (r = 0.88, p 

Sign in / Sign up

Export Citation Format

Share Document