Critical Time for Soybean Seedling Emergence Force

1980 ◽  
Vol 23 (4) ◽  
pp. 0831-0835 ◽  
Author(s):  
Megh R. Goyal ◽  
Leland O. Drew ◽  
Gordon L. Nelson ◽  
Terry J. Logan
Keyword(s):  
Seedling Emergence ◽  
Critical Time ◽  
Soybean Seedling

Soybean seedling emergence at high temperatures

1988 ◽  
Vol 109 (1) ◽  
pp. 139-140 ◽  
Author(s):  
S. U. Wallace
Keyword(s):  
High Temperatures ◽  
Seedling Emergence ◽  
Soybean Seedling

scholarly journals Electrical conductivity of the seed soaking solution and soybean seedling emergence

2004 ◽  
Vol 61 (2) ◽  
pp. 164-168 ◽  
Author(s):  
Roberval Daiton Vieira ◽  
Angelo Scappa Neto ◽  
Sonia Regina Mudrovitsch de Bittencourt ◽  
Maristela Panobianco
Keyword(s):  
Electrical Conductivity ◽  
Water Content ◽  
Seedling Emergence ◽  
Soybean Seed ◽  
Accelerated Aging ◽  
Seed Vigor ◽  
Soybean Seedling ◽  
Seed Soaking ◽  
Laboratory Conditions ◽  
Field And Laboratory Conditions

Vigor of soybean [Glycine max (L.) Merrill] seeds can be evaluated by measuring the electrical conductivity (EC) of the seed soaking solution, which has shown a satisfactory relationship with field seedling emergence, but has not had aproper definition of range yet. This work studies the relationship between EC and soybean seedling emergence both in the field and laboratory conditions, using twenty two seed lots. Seed water content, standard germination and vigor (EC, accelerated aging and cold tests) were evaluated under laboratory conditions using -0.03; -0.20; -0.40 and -0.60 MPa matric potentials, and field seedling emergence was also observed. There was direct relationship between EC and field seedling emergence (FE). Under laboratory conditions, a decreasing relationship was found between EC and FE as water content in the substrate decreased. Relationships between these two parameters were also found when -0.03; -0.20 and -0.40 MPa matric potentials were used. EC tests can be used successfully to evaluate soybean seed vigor and identify lots with higher or lower field emergence potential.

scholarly journals EFFECTS OF DOUBLE V-SHAPED OPENERS WITH FURROW COMPACTION FUNCTION ON SEEDBED CHARACTERISTICS AND SOYBEAN EMERGENCE UNDER DOUBLE ROW RIDGE CULTIVATION TECHNIQUE

2020 ◽  
Vol 60 (1) ◽  
pp. 311-322
Author(s):  
Jiaxin Zheng ◽  
Jiameng Fang ◽  
Yuqing Zhao ◽  
Yong Zhao ◽  
Zhi Yang ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Seedling Emergence ◽  
Soil Physical Properties ◽  
Seedling Height ◽  
Emergence Time ◽  
Soybean Seedling ◽  
Double Row ◽  
Cultivation Technique ◽  
Compaction Force ◽  
Greenhouse Tests

Based on the technical characteristics of double-row ridge planting, a double V-shaped opener with the furrow compaction function was designed. This opener with the sliding knife and profiling mechanism was capable of furrow opening, compacting and profiling, and thereby created excellent seedbeds with tight bottom and soft soils. Through sunlight greenhouse tests, the effects of the double V-shaped opener on seedbed characteristics and soybean emergence were studied under the compaction forces of T1 (0 N), T2 (500 N), T3 (600 N) and T4 (700 N). The furrow compaction planting significantly affected the seedbed characteristics and soybean emergence and could preserve soil moisture in seedbeds. Under the semiarid condition, the average emergence time under T2 was 0.79 day earlier than under T1, and the emergence rates under T2, T3 and T4 were significantly raised. The seedling height uniformity under T2 was 5.34% higher than under T1. The average emergence time ranked from early to later as T3<T4<T2. The deep seeding uniformity, the emergence uniformity and the average seedling height were all improved as the furrow compaction force was enlarged within 500-700 N. Furrow compaction could preserve soil moisture in seedbeds, and the seedbed soil physical properties and soybean seedling emergence were optimized under the furrow compaction force of 600-700 N.

Moisture and Soybean Seedling Emergence

1981 ◽  
Vol 24 (6) ◽  
pp. 1432-1435 ◽  
Author(s):  
Megh R. Goyal ◽  
Gordon L. Nelson ◽  
Leland O. Drew ◽  
Thomas G. Carpenter ◽  
Terry J. Logan
Keyword(s):  
Seedling Emergence ◽  
Soybean Seedling

Effect of Herbicides on Seedling Emergence Force

Weed Science ◽  
1971 ◽  
Vol 19 (2) ◽  
pp. 182-184 ◽  
Author(s):  
O. C. Burnside
Keyword(s):  
Glycine Max ◽  
Seedling Emergence ◽  
Soybean Seedling ◽  
Soybean Seedlings ◽  
Average Maximum ◽  
Stimulation Of

A method is described to quantitatively record the upward force of an emerging seedling that exhibits epigeal germination. A soybean [Glycine max (L.) Merr.] seedling showed an average maximum emergence thrust of 434 g at 8 to 10 days after planting. Herbicides can be grouped into those that inhibit, have no effect, or stimulate the upward thrust exerted by an emerging soybean seedling. At the rates studied, the herbicide 4-amino-3,5,6-trichloropicolinic acid (picloram) showed the greatest inhibition and 3-amino-2,5-dichlorobenzoic acid (chloramben) the greatest stimulation of emergence force of soybean seedlings.

Soybean Seedling Emergence Influenced by Days of Soil Water Stress and Soil Temperature

1996 ◽  
Vol 88 (4) ◽  
pp. 657-661 ◽  
Author(s):  
Theodore C. Helms ◽  
Edward Deckard ◽  
Robert J. Goos ◽  
John W. Enz
Keyword(s):  
Water Stress ◽  
Soil Temperature ◽  
Soil Water ◽  
Seedling Emergence ◽  
Soybean Seedling ◽  
Soil Water Stress

scholarly journals Junglerice (Echinochloa colona L.) seedling emergence model as a tool to optimize pre-emergent herbicide application

2021 ◽  
Author(s):  
Gabriel Picapietra ◽  
Horacio A. Acciaresi
Keyword(s):  
Weed Control ◽  
Production Systems ◽  
Seedling Emergence ◽  
Critical Time ◽  
Weed Suppression ◽  
Economic Losses ◽  
Buenos Aires Province ◽  
Herbicide Application ◽  
Control Cost ◽  
Management Tools

Junglerice (Echinochloa colona), one of the worst and most problematic weeds in the world, causes large economic losses as a result of yield loss and control cost increase. Taking into account that this weed emerges in approximately five months from September to January, and considering that reducing herbicide use is key in the current intensification of agricultural production systems, the present study was carried out under the hypothesis that there should be an optimal moment for pre-emergent herbicide application to achieve maximum weed control effectiveness and efficiency. Experiments were therefore carried out from August 2016 to January 2021 in Pergamino, Buenos Aires province, Argentina, using a double-logistic emergence model of junglerice seedlings. Bicyclopyrone plus s-metolachlor, clomazone, and pyroxasulfone plus saflufenacil were applied at different times between 92 and 478 growing degree days (GDD). Single applications between 348 and 399 GDD were observed to reduce junglerice seedling emergence by 85-99%, depending on the herbicide used. Such a seedling emergence reduction could, in combination with a competitive crop and within a sustainable production system, be a convenient strategy to provide significant weed suppression in the field. The overall results from the present study lead to the conclusion that using predictive models for pre-emergent herbicide applications ensures a more effective use of herbicides and reduces the amounts of herbicides used as well as the risks of selecting herbicide-resistant junglerice populations. Highlights - Weed occurrence indirectly increases the number of herbicide applications in Argentina. - Reducing the number and volume of herbicide applications contributes to mitigating environmental impact in the short term. - There is a critical time during weed emergence in which chemical control via herbicide application is most effective. - Seedling emergence models are useful management tools to predict critical timing for weed control.

Seed Vigor, Soilborne Pathogens, Preemergent Growth, and Soybean Seedling Emergence

Crop Science ◽  
2002 ◽  
Vol 42 (2) ◽  
pp. 451-457 ◽  
Author(s):  
Brigitte Hamman ◽  
D. B. Egli ◽  
Gwen Koning
Keyword(s):  
Seedling Emergence ◽  
Seed Vigor ◽  
Soilborne Pathogens ◽  
Soybean Seedling
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