Diurnal Leaf Movement Effects on Spray Interception and Glyphosate Efficacy

1999 ◽  
Vol 13 (3) ◽  
pp. 466-470 ◽  
Author(s):  
Jason K. Norsworthy ◽  
Lawrence R. Oliver ◽  
Larry C. Purcell
Keyword(s):  
Nitrate Solution ◽  
Potassium Nitrate ◽  
Time Of Day ◽  
Ipomoea Lacunosa ◽  
Sesbania Exaltata ◽  
Pitted Morningglory ◽  
Potassium Nitrate Solution ◽  
Hemp Sesbania ◽  
Sida Spinosa ◽  
Prickly Sida

Time of day at which a herbicide is applied can affect efficacy, and variability may be attributed to leaf angles at application. Spray interception by hemp sesbania (Sesbania exaltata), sicklepod (Senna obtusifolia), and prickly sida (Sida spinosa) under day and night conditions was quantified by measuring interception of a 2-M potassium nitrate solution. Following the night application, interception by prickly sida, hemp sesbania, and sicklepod was reduced 17, 67, and 70%, respectively. In a second study in the greenhouse, glyphosate was applied to hemp sesbania, pitted morningglory (Ipomoea lacunosa), prickly sida, and sicklepod at 6:00 and 11:00 A.M. and 4:00 and 9:00 P.M. Control of all species was dependent on the time of day treated, with night applications generally being less effective.

Efficacy of Acifluorfen on Broadleaf Weeds. Times and Methods for Application

Weed Science ◽  
1982 ◽  
Vol 30 (5) ◽  
pp. 520-526 ◽  
Author(s):  
Steve D. Lee ◽  
Lawrence R. Oliver
Keyword(s):  
Field Tests ◽  
Alkyl Aryl ◽  
Sesbania Exaltata ◽  
Pitted Morningglory ◽  
Cucurbita Texana ◽  
Comparable Control ◽  
Hemp Sesbania ◽  
Sida Spinosa ◽  
The One ◽  
Prickly Sida

In field tests, common cocklebur (Xanthium pensylvanicumWallr.) was controlled at the one- and two-leaf stages with 0.3 kg/ha acifluorfen {5-[2-chloro-4-(trifluoromethyl)phenoxy]-2-nitrobenzoic acid}. Four-leaf common cocklebur required 1.1 kg/ha for comparable control. Acifluorfen at 0.6 and 0.8 kg/ha controlled 96 and 90% of entireleaf morningglory [Ipomoea hederacea(L.) Jacq. var.integriuscula] atone- and two-leaf stages, respectively, but control was reduced as plants aged. Dark applications (2100 h) were more effective than those at sun-up (0600 h) or midday (1200 h) in control of hemp sesbania [Sesbania exaltata(Raf.) Cory], pitted morningglory (Ipomoea lacunosaL.), and smooth pigweed (Amaranthus hybridusL.). Hour of application had no significant influence on control of common cocklebur or prickly sida (Sida spinosaL.). An increase in surfactant (80% alkyl aryl polyoxyethylene glycols) concentration enhanced acifluorfen control of entireleaf morningglory and Texas gourd [Cucurbita texana(A.) Gray] at the 0.3-kg/ha rate applied 2 weeks after emergence. Soybean [Glycine max(L.) Merr.] injury was increased with the 1.1-kg/ha rate when surfactant concentration was increased from 0.5 to 0.75%. Increasing the spray volume increased pitted morningglory control but decreased hemp sesbania control. In the growth chamber, better control of pitted morningglory and common cocklebur was obtained at high (35 C day, 26 C night) than at low temperatures (27 C day, 18 C night) when plants were treated 1 week after emergence.

Influence of Time of Planting and Distance from the Cotton (Gossypium hirsutum) Row of Pitted Morningglory (Ipomoea lacunosa), Prickly Sida (Sida spinosa), and Redroot Pigweed (Amaranthus retroflexus) on Competitiveness with Cotton

Weed Science ◽  
1980 ◽  
Vol 28 (5) ◽  
pp. 568-572 ◽  
Author(s):  
G. A. Buchanan ◽  
J. E. Street ◽  
R. H. Crowley
Keyword(s):  
Gossypium Hirsutum ◽  
Amaranthus Retroflexus ◽  
Fresh Weight ◽  
Weed Species ◽  
Ipomoea Lacunosa ◽  
Redroot Pigweed ◽  
Weed Growth ◽  
Pitted Morningglory ◽  
Sida Spinosa ◽  
Prickly Sida

Influence of time of planting and distance from the cotton row of pitted morningglory (Ipomoea lacunosaL.), prickly sida (Sida spinosaL.), and redroot pigweed (Amaranthus retroflexusL.) on yield of seed cotton (Gossypium hirsutumL. ‘Stoneville 213’) was determined on Decatur clay loam during 1975 through 1978. Weed growth was measured in 1977 and 1978. Seeds of the three weed species were planted 15, 30, or 45 cm from the cotton row at time of planting cotton or 4 weeks later. Weeds planted 4 weeks after planting cotton grew significantly less than did weeds planted at the same time as cotton. When planted with cotton, redroot pigweed produced over twice as much fresh weight as did prickly sida or pitted morningglory. The distance that weeds were planted from the cotton row did not affect weed growth in 1978, but did in 1977. The distance that weeds were planted from the cotton row did not affect their competitiveness in any year as measured by yield of cotton. However, in each year, yields of cotton were reduced to a greater extent by weeds planted with cotton than when planted 4 weeks later. In 3 of 4 yr, there were significant differences in competitiveness of each of the three weed species with cotton.

Weed Seed Germination Under Simulated Drought

Weed Science ◽  
1973 ◽  
Vol 21 (4) ◽  
pp. 322-324 ◽  
Author(s):  
C. S. Hoveland ◽  
G. A. Buchanan
Keyword(s):  
Weed Seed ◽  
Weed Species ◽  
Pennisetum Typhoides ◽  
Ipomoea Lacunosa ◽  
Sesbania Exaltata ◽  
Simulated Drought ◽  
Sorghum Sudangrass ◽  
Sida Spinosa ◽  
Prickly Sida ◽  
Better Than

Seeds of five crop and 17 weed species were germinated with 0, 3, 6, and 10-bar water solutions of polyethylene glycol to simulate drought. With simulated drought, most weed species germinated better than soybeans (Glycine maxL. ‘Hampton 266A’) but were not equal to pearlmillet [Pennisetum typhoides(Burm.) Stapf. and C. E. Hubb ‘Millex 23’] or sorghum-sudangrass [Sorghum bicolor(L.) Moench xS. sudanense(Piper) ‘SX-16’]. Prickly sida (Sida spinosaL,), sicklepod (Cassia obtusifoliaL.), andIpomoea lacunosaL. were the most tolerant weed species to simulated drought. Four species were intermediate in tolerance and four species germinated poorly under simulated drought. Hemp sesbania [Sesbania exaltata(Raf.) Cory] was the least tolerant and was similar to soybean.

Uptake, translocation, and metabolism of sulfentrazone in peanut, prickly sida (Sida spinosa), and pitted morningglory (Ipomoea lacunosa)

Weed Science ◽  
2005 ◽  
Vol 53 (4) ◽  
pp. 446-450 ◽  
Author(s):  
Walter E. Thomas ◽  
Shawn C. Troxler ◽  
W. David Smith ◽  
Loren R. Fisher ◽  
John W. Wilcut
Keyword(s):  
Plant Species ◽  
Plant Part ◽  
Ipomoea Lacunosa ◽  
Pitted Morningglory ◽  
Harvest Timing ◽  
Sida Spinosa ◽  
Prickly Sida

Studies were conducted to evaluate uptake, translocation, and metabolism of root-absorbed14C-sulfentrazone in peanut, prickly sida, and pitted morningglory. Peanut absorbed more than five and three times greater14C-sulfentrazone than pitted morningglory and prickly sida, respectively. All plant species translocated appreciable amounts (≥ 39%) of radioactivity to the leaves. The three plant species had some capacity to metabolize14C-sulfentrazone. At 3 h after treatment, 7, 29, and 71% of the radioactivity in the shoots of peanut, prickly sida, and pitted morningglory, respectively, was sulfentrazone. Sulfentrazone levels in the shoots at 3 and 6 h after treatment correspond to reported tolerance levels, with peanut being the most tolerant of the three species, whereas prickly sida and pitted morningglory are moderately tolerant and completely susceptible to sulfentrazone, respectively. Levels of metabolites varied among species, plant part, and harvest timing. On the basis of these data, tolerance in peanut is largely due to its ability to rapidly metabolize sulfentrazone.

The Effects of Naturally Occurring Phenolic Compounds on Seed Germination

Weed Science ◽  
1982 ◽  
Vol 30 (2) ◽  
pp. 206-212 ◽  
Author(s):  
Robert D. Williams ◽  
Robert E. Hoagland
Keyword(s):  
Chlorogenic Acid ◽  
Amaranthus Retroflexus ◽  
Hydroxybenzoic Acid ◽  
Weed Species ◽  
Allelopathic Potential ◽  
Sesbania Exaltata ◽  
Hydrocinnamic Acid ◽  
Hemp Sesbania ◽  
Sida Spinosa ◽  
Prickly Sida

Caffeic acid, chlorogenic acid, coumarin,p-coumaric acid, ferulic acid, fumaric acid, gallic acid, hydrocinnamic acid,p-hydroxybenzoic acid, juglone, and pyrocatechol were examined for effects on germination of nine crop and weed species: cotton (Gossypium hirsutumL.), cantaloupe (Cucumis meloL.), corn (Zea maysL.), sorghum [Sorghum bicolor(L.) Moench], hemp sesbania [Sesbania exaltata(Raf.) Cary], sicklepod (Cassia obtusifoliaL.), velvetleaf (Abutilon theophrastiMedic), prickly sida (Sida spinosaL.), and redroot pigweed (Amaranthus retroflexusL.). Germination tests with 10-3and 10-5M solutions were conducted under controlled conditions in petri dishes at 25 C in the dark. At 10-3M, coumarin, hydrocinnamic acid, juglone and pyrocatechol inhibited germination, butp-hydroxybenzaldehyde andp-hydroxybenzoic acid were not effective and others had intermediate effects. There was little effect by any compound at 10-5M. Chlorogenic acid,p-hydroxybenzaldehyde, and pyrocatechol, each combined with coumarin, inhibited germination. The combination of coumarin plusp-hydroxybenzaldehyde had an additive effect on hemp sesbania and prickly sida, inhibiting germination to a greater extent than either compound alone. The lack of inhibitory action at the higher concentration of some of these chemicals suggests they may not exhibit a high allelopathic potential.

Interactions of Diphenylether Herbicides with Chlorimuron and Imazaquin

1992 ◽  
Vol 6 (2) ◽  
pp. 345-351 ◽  
Author(s):  
M. Todd Wesley ◽  
David R. Shaw
Keyword(s):  
Field Experiment ◽  
High Rate ◽  
Pitted Morningglory ◽  
Hemp Sesbania ◽  
Prickly Sida ◽  
Antagonistic Interactions

Field experiment were conducted to determine interactions of chlorimuron or imazaquin with fomesafen, lactofen, or acifluorfen on three-leaf and eight-leaf common cocklebur, hemp sesbania, pitted morningglory, and prickly sida. Antagonism was the most common interaction with common cocklebur, and was most severe with chlorimuron combined with fomesafen or acifluorfen, whereas lactofen did not antagonize common cocklebur control. Reductions in control were greater when low rates of chlorimuron were used. On three-leaf prickly sida, control synergistically increased when imazaquin was combined with fomesafen or acifluorfen, but the majority of these combinations were additive on eight-leaf prickly sida. Three-leaf pitted morningglory control synergistically increased when 36 g ai ha–1imazaquin was combined with 210 g ai ha–1fomesafen or 110 or 220 g ai ha–1lactofen. With eight-leaf pitted morningglory, synergism occurred when 2 g ai ha–1chlorimuron was combined with the high rate of any diphenylether herbicide tested, and when 36 g ha–1imazaquin was combined with 110 g ha–1lactofen or 210 g ai ha–1acifluorfen; however, at higher rates of chlorimuron or imazaquin, several antagonistic interactions occurred. Hemp sesbania was controlled over 90% by all combinations, and no interactions occurred.

Adsorption of nitrate, chloride and sulfate by some highly weathered soils from south-wast Queensland

Soil Research ◽  
1979 ◽  
Vol 17 (2) ◽  
pp. 271 ◽  
Author(s):  
AS Black ◽  
SA Waring
Keyword(s):  
Nitrate Solution ◽  
Potassium Nitrate ◽  
Stepwise Multiple Regression ◽  
Relative Importance ◽  
Sulfate Adsorption ◽  
Potassium Nitrate Solution ◽  
Red Earth ◽  
The Mean ◽  
Highly Weathered Soils ◽  
Soil Groups

Soil was collected from a number of sites and depths to 300 cm within four great soil groups (krasnozem, red earth, xanthozem, podzolic). Nitrate, chloride and sulfate adsorption were determined at the soil pH. Various soil properties likely to influence the magnitude of adsorption were determined, and their relative importance to adsorption was assessed using stepwise multiple regression. The subsoils of all four soil groups adsorbed nitrate ranging up to 0.47 mmoles/100 g from 0.005 M potassium nitrate solution. The mean adsorption for soil groups decreased in the order krasnozem, xanthozem, red earth and podzolic. Chloride and sulfate adsorption was largely equivalent to that of nitrate. The variations in adsorption between and within great soil groups could be attributed to changes in organic matter, smectite minerals, hydroxy aluminium, surface area and pH.

scholarly journals Effects of Seed Treatments and Planting Depth on Emergence of Sea Buckthorn Species

1999 ◽  
Vol 9 (2) ◽  
pp. 213-216 ◽  
Author(s):  
Thomas S.C. Li ◽  
Douglas A. Wardle
Keyword(s):  
Plant Height ◽  
Room Temperature ◽  
Nitrate Solution ◽  
Growing Season ◽  
Potassium Nitrate ◽  
Seed Treatments ◽  
Planting Depth ◽  
Potassium Nitrate Solution ◽  
Average Plant ◽  
Average Plant Height

The influence of seed treatments and planting depth on the percentage of seed emergence of Hippophae rhamnoides L. `Indian-Summer', H. tibetana Schlecht., H. neurocarpa Liu & He, H. salicifolia D. Don, and H. rhamnoides subsp. rhamnoides, sinensis, turkestanica, and mongolica were studied. Surface seeding had higher percentages of seed emergence and more rapid completion of emergence compared to a 1- or 2-cm (0.4- or 0.8-inch) seeding depth. Seeds soaked in water or potassium nitrate solution at room temperature emerged in higher percentages. Average plant height of the eight species and subspecies varied significantly at the end of first growing season.

scholarly journals Investigation of Inhibitor Polyphosphate Properties for Rotating Steel Disk Electrode in Potassium Nitrate Solution

2016 ◽  
Vol 2 (2) ◽  
pp. 167
Author(s):  
E.A. Dorokhova ◽  
B.D. Burkitbaeva ◽  
I.B. Melsitova ◽  
T.Z. Ahkmetov ◽  
V.I. Kapralova
Keyword(s):  
Experimental Data ◽  
Protective Effect ◽  
Steel Surface ◽  
Nitrate Solution ◽  
Potassium Nitrate ◽  
Disk Electrode ◽  
Experimental Conditions ◽  
Inhibiting Action ◽  
Steel Disk ◽  
Potassium Nitrate Solution

<p>Inhibition properties of a number of glass-like polyphosphates on 65J steel were investigated using the gravimetry and methods potassium nitrate solution polarization curves in a 0,1M (pH=6,05). The possibilities<br />of optimum experimental conditions were considered as well. Basing on the experimental data the inhibition coefficient and protective effect were found. The inhibiting action of polyphosphates, apparently, is due to the formation of inhomogeneous protecting film on the steel surface.</p>

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