Joint Effects of Acifluorfen Applications and Soybean Thrips (Sericothrips variabilis) Feeding on Soybean (Glycine max)

Weed Science ◽  
1988 ◽  
Vol 36 (5) ◽  
pp. 667-670 ◽  
Author(s):  
Randy M. Huckaba ◽  
Harold D. Coble ◽  
John W. Van Duyn
Keyword(s):  
Glycine Max ◽  
Seed Yield ◽  
Sodium Salt ◽  
Growth Parameters ◽  
Soybean Seed ◽  
Field Studies ◽  
Interactive Effects ◽  
Root Weight ◽  
Shoot Weight ◽  
Soybean Thrips

Field studies were conducted during 1983 and 1984 to determine the single and interactive effects of trifluralin, soybean thrips, and the sodium salt of acifluorfen on soybean. Increased soybean injury was observed in 1983 when acifluorfen at 0.6 kg ai/ha was applied to soybeans infested with soybean thrips versus plants where soybean thrips were controlled. Soybean injury measured by percent defoliation and visual injury ratings was reduced when thrips were controlled versus soybeans where thrips were not controlled with carbaryl at 0.9 kg ai/ha in 1983. Soybean thrips alone did not reduce soybean seed yield in this study. Acifluorfen reduced soybean photosynthetic rate, shoot weight, root weight, and seed yield. Trifluralin had no effect on soybean growth parameters measured in this study.

Soybean (Glycine max) and Rotational Crop Response to PPI Chlorimuron, Clomazone, Imazaquin, and Imazethapyr

1994 ◽  
Vol 8 (2) ◽  
pp. 224-230 ◽  
Author(s):  
Ronald F. Krausz ◽  
George Kapusta ◽  
Joseph L. Matthews
Keyword(s):  
Glycine Max ◽  
Seed Yield ◽  
Wheat Yield ◽  
Soybean Seed ◽  
Field Studies ◽  
Corn Yield ◽  
Crop Response ◽  
Crop Tolerance ◽  
Height Reduction ◽  
Rotational Crop

Field studies were conducted from 1989 to 1992 to evaluate soybean and rotational crop tolerance to PPI applications of chlorimuron (23 to 140 g ai/ha), clomazone (560 to 3360 g/ha), imazaquin (70 to 420 g/ha), and imazethapyr (53 to 310 g/ha). Soybean injury was evident only in 1989. Soybean height reduction 45 d after application increased linearly with increasing rates of chlorimuron, imazaquin, and imazethapyr. Chlorimuron at 140 g/ha and imazaquin at 420 g/ha reduced soybean height 120 d after planting. None of the herbicides influenced soybean density. Chlorimuron and imazaquin reduced soybean seed yield linearly as rates increased. None of the herbicides reduced subsequent wheat yield. Corn height reduction increased as the rate of imazaquin and imazethapyr increased. Imazethapyr and imazaquin caused 2 to 40% and 1 to 12% height reduction at 30 d after planting, respectively. Imazethapyr at 310 g/ha applied the previous year reduced corn height at 120 d after planting. There were no differences in corn density. Imazaquin and imazethapyr at 420 and 310 g/ha, respectively, applied the previous year reduced corn yield.

Weed Control for Soybean (Glycine max) Planted in a Stale or Undisturbed Seedbed on Clay Soil

1992 ◽  
Vol 6 (1) ◽  
pp. 119-124 ◽  
Author(s):  
Larry G. Heatherly ◽  
C. Dennis Elmore ◽  
Richard A. Wesley
Keyword(s):  
Glycine Max ◽  
Weed Control ◽  
Seed Yield ◽  
Clay Soil ◽  
Soybean Seed ◽  
Field Studies ◽  
No Till ◽  
Seed Yields ◽  
Made In

Field studies were conducted for three consecutive years to determine if PRE and/or POST herbicides were needed in addition to preplant foliar-applied glyphosate and POST cultivation for maximum seed yield of irrigated and nonirrigated soybean planted in stale and undisturbed seedbeds on clay soil. Soybean seed yields following the use of PRE and POST herbicides alone or in combination were similar in all years, and exceeded seed yield following the use of glyphosate plus POST cultivation only. Plantings made in no-till and fall-till seedbeds produced similar seed yields when both PRE and POST herbicides were used. These results indicate that glyphosate plus cultivation was not adequate for soybean in stale seedbed plantings, and that either PRE or POST herbicides, but not both, were required for maximum seed yield.

Sicklepod (Senna obtusifolia) Control in Soybean (Glycine max) with Imazaquin and Metribuzin Combinations

1996 ◽  
Vol 10 (1) ◽  
pp. 78-84 ◽  
Author(s):  
Robert E. Etheridge ◽  
Edward C. Murdock ◽  
Gregory S. Stapleton ◽  
Joe E. Toler
Keyword(s):  
Glycine Max ◽  
Seed Yield ◽  
Soil Type ◽  
Soybean Seed ◽  
Field Studies ◽  
Weed Biomass ◽  
Senna Obtusifolia ◽  
Untreated Check ◽  
Sequential Treatments ◽  
Yield Responses

Field studies were conducted in 1993 and 1994 to evaluate sicklepod control with combinations of imazaquin + metribuzin at lower than normal use rates. Soybean was seeded in late-May to early-June each year and imazaquin and metribuzin were applied PPI alone at 0.75 and 1x and 0.5, 0.75, and 1x their registered rates, respectively, and in factorial combinations of their 0.5 and 0.75x rates. The registered (1x) rates for imazaquin and metribuzin on this soil type are 0.14 and 0.43 kg/ha, respectively. Several standard sequential treatments and flumetsulam + trifluralin PPI at 0.06 + 0.70 and 0.07 + 0.95 kg/ha were included for comparison. Sicklepod control and soybean seed yield responses differed between 1993 and 1994. In 1993, the combinations of imazaquin + metribuzin averaged 90% control 6 wk after planting (WAP) and soybean seed yield increased 75% compared to the untreated check. Imazaquin + metribuzin at their respective 0.5x rate was as effective as any treatment evaluated. In 1994, sicklepod control was generally lower with all treatments. Soybean seed yield was reduced due to sicklepod interference with soil-applied treatments alone. However, imazaquin + metribuzin at their respective 0.75x rate provided sicklepod control levels and reductions in weed biomass similar to those observed with flumetsulam + trifluralin at 0.07 + 0.95 kg/ha and the sequential treatments, and increased soybean seed yield 19% compared to the untreated check.

Interactions Between Soybean (Glycine max) Cultivars and Selected Weeds

Weed Science ◽  
1988 ◽  
Vol 36 (6) ◽  
pp. 770-774 ◽  
Author(s):  
David W. Monks ◽  
Lawrence R. Oliver
Keyword(s):  
Glycine Max ◽  
Seed Yield ◽  
Soybean Seed ◽  
Growing Season ◽  
Field Studies ◽  
Palmer Amaranth ◽  
The Other ◽  
Weed Species ◽  
Competitive Effects ◽  
Soybean Cultivars

Competition of weeds was characterized by determining the distance down the soybean row that a weed affects soybean biomass and yield. Field studies were conducted for 2 yr to compare competitive effects of common cocklebur, johnsongrass, Palmer amaranth, sicklepod, and tall morningglory on ‘Forrest’ and ‘Centennial’ soybeans. The weeds did not significantly reduce soybean biomass for 6 weeks after emergence. Palmer amaranth, common cocklebur, and tall morningglory had the greatest biomass by 6 weeks after emergence. However, only competition from common cocklebur and Palmer amaranth measurably reduced soybean biomass during the growing season. Biomass of Forrest and Centennial soybeans was reduced when these cultivars were growing within 12.5 and 50 cm of common cocklebur, respectively. Johnsongrass, sicklepod, and tall morningglory grew more slowly than the other weeds and had no measurable competitive effects on soybean biomass. Soybean competition reduced biomass of all weeds 90 to 97%. Soybean cultivar influenced the level and duration of competitiveness depending on the weed species present. Biomass of both soybean cultivars was reduced when they were growing within 50 cm of Palmer amaranth. Soybean seed yield was reduced when soybeans were growing within 25 cm of common cocklebur and Palmer amaranth and also when they were growing within 12.5 cm of tall morningglory. Sicklepod had no effect on soybean seed yield.

scholarly journals Impact of endomycorrhizal fungi and other bioinoculants on growth enhancement of Glycine max (L.) Merrill

2012 ◽  
Vol 4 (1) ◽  
pp. 111-116
Author(s):  
Alpa Alpa ◽  
Neetu Neetu ◽  
Anju Tanwar ◽  
Ashok Aggarwal ◽  
K.K. Gupta
Keyword(s):  
Glycine Max ◽  
Arbuscular Mycorrhizal Fungi ◽  
Mycorrhizal Fungi ◽  
Growth Parameters ◽  
Trichoderma Viride ◽  
Arbuscular Mycorrhizal ◽  
Growth Enhancement ◽  
Root Weight ◽  
Glycine Max L ◽  
Shoot Weight

In the present investigation, the contributions of two indigenous arbuscular mycorrhizal fungi (Glomus mosseae and Acaulospora laevis), along with Trichoderma viride and Bradyrhizobium japonicum on growth parameters of Soybean, Glycine max (L.) Merrill were investigated. The results obtained indicated the dependence of soybean on mycorrhizal symbiosis. The different growth parameters increased significantly after 120 days of inoculation in comparison to control. Among all the growth parameters studied, plant height (162±3.34), fresh shoot weight (31.26±1.45), dry shoot weight (3.52±0.05), fresh root weight (4.07±0.56), dry root weight (1.03±0.03), root length (49.0±4.47) and leaf area (32.58±1.70) were highest in the combination of G. mosseae + A. laevis + T. viride + B. japonicum but arbuscular mycorrhizal (AM) spore number (95.2±3.19) and percent mycorrhizal root colonization (93.26±3.96) were maximum in single inoculation of G. mosseae. Second most effective results were observed in the plants treated with G. mosseae alone. Thus the presence of arbuscular mycorrhizal fungi (AMF) and other bioinoculants in rhizosphere of soybean had positive effect on the different growth parameters.

scholarly journals Effects of Combined Application of Cow Manure And Inorganic Nitrogen Fertilizer on Growth, Yield and Nitrogen Uptake of Black Rice

Akta Agrosia ◽  
2018 ◽  
Vol 21 (2) ◽  
pp. 55-60
Author(s):  
Marwanto Marwanto ◽  
Nasiroh Nasiroh ◽  
Bambang G. Mucitro ◽  
Merakati Handajaningsih
Keyword(s):  
Growth Parameters ◽  
N Uptake ◽  
Fertilizer Application ◽  
N Fertilizer ◽  
Root Weight ◽  
Cow Manure ◽  
Black Rice ◽  
Inorganic N ◽  
Yield Attributes ◽  
Shoot Weight

The beneficial effects of manure on soil properties, growth, and crop productivity have promoted its use for replacing the application of N fertilizer. However, it is not well understood to what extent N fertilizer was able to be substituted by cow manure. Accordingly, this pot experiment aimed to compare the effect of inorganic N fertilizer application alone with that of the combined use of inorganic N fertilizer with cow manure based on the same amount of total N on growth parameters, yield attributes, and nitrogen (N) uptake of black rice. The experiment was conducted under a screen house condition in Agriculture Faculty, Bengkulu University located at 15 meters altitude above sea level during the summer season of 2015. There were six treatments viz. T1 = 100% N from urea + 0% N from cow manure (0.52 g N + 0.00 g cow manure) pot-1, T2 = 80% N from urea  + 20% N from cow manure  (0.42 g N + 9.55 g cow manure) pot-1, T3 = 60% N from urea + 40% N from cow manure (0.31 g N  + 19.10 g cow manure) pot-1, T4 = 40% N from urea + 60% N from cow manure (0.21 g N + 28.65 g cow manure) pot-1, T5 = 20% N from urea + 80% N from cow manure (0.10 g N+ 38.20 g cow manure) pot-1, and T6 = 0% N from urea + 100% N from cow manure (0.00 g N  + 47.75 g cow manure) pot-1. The amount of inorganic N fertilizer in the form of urea and cow manure applied was calculated based on the recommended rate of 115.00 kg ha-1 for N fertilizer and 10.50 ton ha-1 for cow manure. These treatments were arranged in a Completely Randomized Design and repeated three times. The results showed that the treatments significantly (P ?0.005) affected growth parameters as measured by plant height, the number of leaves, fresh shoot weight, fresh root weight, dry shoot weight, dry root weight, yield attributes as determined by the total number of tillers, the total number productive tillers, grain yield per pot, and N uptake. The highest values for all these variables were obtained in the treatment receiving recommended rate of urea only (100% N from urea + 0% N from cow manure as equivalence) and the lowest in the treatment receiving a100% N from cow manure (0% N from urea + 100% N from cow manure). However, combined treatments of cow manure and inorganic N fertilizer such as 80% N from urea  + 20% N from cow manure, 60% N from urea + 40% N from cow manure 40% N from urea + 60% N from cow manure showed a parity statistically with the treatment receiving 100% N from urea only in maintaining the values for all these variables. Overall, the combined use of inorganic N fertilizer (urea) and cow manure as an equivalence promoted growth and yield of black rice by improving N uptake. Keywords: integrated nutrient management, soil chemical property, Nitrogen uptake, combined fertilizer application, black rice

Use of Seedling Growth Parameters to Classify Soybean (Glycine max) Cultivar Sensitivity to Sulfentrazone

1999 ◽  
Vol 13 (3) ◽  
pp. 530-535 ◽  
Author(s):  
Zhaohu Li ◽  
Robert H. Walker ◽  
Glenn Wehtje ◽  
H. Gary Hancock
Keyword(s):  
Glycine Max ◽  
Seedling Growth ◽  
Root Length ◽  
Reduction Method ◽  
Growth Parameters ◽  
Field Evaluation ◽  
Relative Sensitivity ◽  
Field Studies ◽  
Laboratory Studies ◽  
Length Reduction

Hypocotyl and root length reduction of soybean (Glycine max) seedlings when seeds were exposed to sulfentrazone during germination were used as indices to classify cultivar response to soil-applied sulfentrazone. Seeds of ‘Stonewall’ (sulfentrazone tolerant) and ‘Asgrow 6785’ (sulfentrazone sensitive) were imbibed and allowed to germinate in 0, 1, 5, 10, and 50 ppm aqueous sulfentrazone solutions for 4 d. Hypocotyl and root lengths were reduced in both cultivars, but the reductions were greater for Asgrow 6785 than for Stonewall. Subsequently, the relative sensitivity of 28 cultivars to sulfentrazone was independently determined by two variations of the hypocotyl reduction method (both conducted in the laboratory) and by traditional full-season field evaluation. Results from laboratory and field studies were in agreement for cultivars distinctly sensitive or tolerant to sulfentrazone. However, cultivars with intermediate tolerance in laboratory studies produced variable responses in the field.

Differential Response of Soybean (Glycine max) Cultivars to AC 263,222

1991 ◽  
Vol 5 (2) ◽  
pp. 430-433 ◽  
Author(s):  
Marshall B. Wixson ◽  
David R. Shaw
Keyword(s):  
Glycine Max ◽  
Root Length ◽  
Genetic Basis ◽  
Differential Response ◽  
Hydroponic Culture ◽  
Root Weight ◽  
Ac 263,222 ◽  
Shoot Weight ◽  
Common Parent ◽  
Length Reduction

Thirty soybean cultivars were grown in a hydroponic culture to observe differential tolerance to AC 263,222. Root length was reduced with 1.1 mM AC 263,222 in 18 of the 30 cultivars. ‘Bedford’, ‘Asgrow 5403’, and ‘Asgrow 6297’ were cultivars with a root length reduction of 30% or more, whereas roots of ‘DPL 506’, ‘RA 606’, and ‘Coker 6727’ were reduced less than 7%. Root weight was reduced in only 10 of the 30 cultivars. Asgrow 6297, ‘Bragg’, and ‘Narow’ root weights were reduced more than 20%. Shoot weight was reduced in 23 cultivars, and ‘Coker 6955’, ‘Braxton’, ‘Coker 485’, ‘Epps', and Coker 6727 shoots were reduced more than 25%. The most tolerant cultivars were ‘Centennial’, RA 606, ‘Tracy M’, ‘Johnston’, and ‘Hartz 7126’. The most sensitive cultivars to AC 263,222 with all response variables measured were Bedford, Asgrow 6297, Asgrow 5403, Coker 6955, Narow, Bragg, and Braxton. These cultivars all have ‘Jackson’ as a common parent. This suggests a genetic basis for AC 263,222 sensitivity in soybean.

Wild Oat (Avena fatua) Competition in Soybean (Glycine max)

Weed Science ◽  
1981 ◽  
Vol 29 (4) ◽  
pp. 410-414 ◽  
Author(s):  
Duane P. Rathmann ◽  
Stephen D. Miller
Keyword(s):  
Glycine Max ◽  
Seed Yield ◽  
Seed Weight ◽  
Soybean Seed ◽  
Avena Fatua ◽  
Wild Oat ◽  
Soybean Yield

The effects of various densities and durations of wild oat (Avena fatuaL.) competition in soybean [Glycine max(L.) Merr. ‘Evans’] were determined in the field during a 2-yr period. Season-long competition by densities of 1, 3,9, and 30 wild oat plants/m of row reduced soybean seed yield an average of 6, 17, 32, and 51%, respectively. An infestation of 30 wild oat plants/m of row did not reduce soybean yield if the period of competition was limited to 4 weeks after crop emergence; however, yields were reduced 29, 50, 63, 58, and 63% when wild oat competed for 5, 6, 7, and 8 weeks, or season long, respectively. Wild oat competition reduced soybean pods per plant and seeds per plant more than seeds per pod or seed weight.

Effect of Imazaquin and Chlorimuron Plus Metribuzin on Sicklepod (Cassia obtusifolia) Interference in Soybean (Glycine max)

1991 ◽  
Vol 5 (1) ◽  
pp. 206-210 ◽  
Author(s):  
David R. Shaw ◽  
Marshall B. Wixson ◽  
Clyde A. Smith
Keyword(s):  
Glycine Max ◽  
Seed Yield ◽  
Dry Matter ◽  
Soybean Seed ◽  
Cassia Obtusifolia ◽  
Soybean Yield ◽  
Herbicide Treatment ◽  
Herbicide Treatments ◽  
Herbicide Use

Three experiments evaluated sicklepod interference with soybean with and without preplant incorporated applications of chlorimuron plus metribuzin or imazaquin. Sicklepod density, weed-free period, and weedy period were examined. In the absence of herbicides, soybean seed yield was reduced with 2 sicklepod plants row m-1, whereas 8 plants row m-1were necessary to reduce yield when herbicides were used. Herbicide use also increased soybean yield at higher sicklepod densities. Chlorimuron plus metribuzin reduced sicklepod dry matter at 8 plants row m-1. To maintain soybean yield, a weed-free period of 4 wk after emergence was required, regardless of treatment. Both herbicide treatments resulted in increased soybean yield at the zero and two wk weed-free periods; however, they did not affect soybean yield when the weed-free period was 4 wk or more. Imazaquin reduced sicklepod density when plots were left weedy full-season, and further reductions were noted with chlorimuron plus metribuzin. A sicklepod weedy interval of 8 wk reduced soybean yield when untreated, but either herbicide treatment extended that interval to 16 wk.

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