New Orleans, LA, United States
New Orleans, LA, United States

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Lofton J.,Macon Ridge Research Station | Mascagni H.J.,Northeast Research Station
Journal of Plant Nutrition | Year: 2016

The influence of soil properties on phosphorus (P) availability of Louisiana alluvial soils is not fully understood. A pot experiment was conducted in 2011 to evaluate the effect of different P fertilizer rate (0, 34, 67, 101 and 134 kg P2O5 ha−1) on corn growth and development on Perry clay and Commerce silt loam (sil) soils and relate Mehlich-3 and Bray-2 soil test P values with yield, total biomass, and P uptake of corn. The Bray-2 P values were six times higher than Mehlich-3 P values for Commerce sil while they were similar for Perry clay. Bray-2 and Mehlich-3 extractable-P of both soils increased with increasing P rate but only corn grown on Perry clay responded to P rate (P < 0.05). Implementation of appropriate testing procedure for estimating plant-available P in soil is an important component of effective P fertilization guidelines for corn. © 2016, © Taylor & Francis.


Godara R.K.,Louisiana State University | Godara R.K.,Northeast Research Station | Williams B.J.,Scott Research Extension Center | Webster E.P.,Louisiana State University | And 2 more authors.
Weed Technology | Year: 2012

Field experiments were conducted in 2006, 2007, and 2008 at the Louisiana State University Agricultural Center's Northeast Research Station near St. Joseph, LA, to evaluate imazosulfuron programs involving rate, application timings, and tank mixes for PRE and POST broadleaf weed control in drill-seeded rice. Imazosulfuron showed residual activity against both Texasweed and hemp sesbania. PRE-applied imazosulfuron at 168 g ai ha -1 and higher rates provided 83 to 93% Texasweed control at 4 WAP. At 12 WAP, Texasweed control with 168 g ha -1 and higher rates was 92%. Hemp sesbania control with 168 g ha -1 and higher rates was 86 to 89% at 4 WAP and 65 to 86% at 12 WAP. Imazosulfuron at 224 g ha -1 applied EPOST provided 84 to 93% Texasweed control and 82 to 87% hemp sesbania control, and it was as effective as its tank mixture with bispyribac-sodium. When applied LPOST, four- to five-leaf Texasweed, imazosulfuron alone at 224 g ha -1 was not effective against Texasweed and hemp sesbania, but did improve weed control when mixed with bispyribac-sodium at 17.6 g ai ha -1. © 2012 Weed Science Society of America.


Griffin J.L.,Louisiana State University | Bauerle M.J.,Louisiana State University | Stephenson III D.O.,Research and Extension Center | Miller D.K.,Northeast Research Station | Boudreaux J.M.,Louisiana State University
Weed Technology | Year: 2013

Availability of soybean with dicamba resistance will provide an alternative weed management option, but risk of dicamba injury to sensitive crops from off-target movement and spray tank contamination is of concern. Research conducted at multiple locations and years evaluated soybean injury and yield response to POST applications of the diglycolamine salt of dicamba. Dicamba was applied at the two to three trifoliate stage (V3/V4) at 4.4, 8.8, 17.5, 35, 70, 140, and 280 g ae ha-1 (1/128 to 1/2 of the recommended use rate of 560 g ae ha-1). Soybean injury 7 d after application was 20% following dicamba at 4.4 g ha-1 and increased to 89% at 280 g ha -1. At 14 d after application, injury for the same rates increased from 39 to 97%. In a separate study, dicamba was applied at first flower (R1) at 1.1, 2.2, 4.4, 8.8, 17.5, 35, and 70 g ha-1 (1/512 to 1/8 of use rate). Soybean injury 7 d following dicamba application was 19% at 1.1 g ha -1 and increased to 64% at 70 g ha-1. For the same rates of dicamba, injury from 7 to 14 d after application increased no more than 4 percentage points. For dicamba rates in common for the timing studies, soybean injury 14 d after treatment was greatest for application at V3/V4, but the negative effect on mature soybean height and yield was greatest for application at R1. For dicamba at 4.4 g ha-1 (1/128th of use rate), soybean yield was reduced 4% when applied at V3/V4 and 10% when applied at R1. For 17.5 g ha-1 dicamba (1/32 of use rate), yield was reduced 15% at V3/V4 and 36% at R1. Based on yield reductions for 4.4 and 17.5 g ha-1 dicamba, soybean at flowering was around 2.5 times more sensitive compared with vegetative exposure.


Godara R.K.,Louisiana State University | Williams B.J.,Scott Research Extension Center | Williams B.J.,Northeast Research Station | Webster E.P.,Louisiana State University
Weed Technology | Year: 2011

Texasweed is an annual broadleaf plant belonging to the Euphorbiaceae family and is an emerging problem in southern U.S. rice fields. Field studies were conducted in 2008 and 2009 to study the effect of flood depth on Texasweed survival and growth. The trearments were five flood depths: 0, 10, 15, 20, and 30 cm and two Texasweed growth stages: two- to three-leaf stage and four- to five-leaf stage. The experiment was conducted in a completely randomized split-plot design with three replications. Flooding conditions were created by placing potted plants in 1.3 m by 0.7 m by 0.7 m polyvinyl chloride troughs. The effect of flood depth on Texasweed growth and fruit production was evaluated using ANOVA and regression analysis. Texasweed plants were able to survive in floods up to 30 cm; however, growth and fruit production were reduced. Increasing flood depths resulted in increased plant height and greater biomass allocation to stem. Texasweed plants produced adventitious roots and a thick spongy tissue, secondary aerenchyma, in the submerged roots and stem, which may play a role in its survival under flooded conditions. The recommended flood depth for rice in Louisiana is 5 to 10 cm. A 10-cm flood in the present study caused about 30 and 15% biomass reduction in two- to three-leaf and four- to five-leaf stage Texasweed, respectively. The results, thus, suggest that flooding alone may not be a viable option for Texasweed management in drill-seeded rice. However, appropriate manipulation of flooding could enhance the effectiveness of POST herbicides. This aspect needs further investigation. © Weed Science Society of America.


Burris E.,Northeast Research Station | Burns D.,Agricultural Center Cooperative Extension Service | McCarter K.S.,161 Agricultural Administration Building | Overstreet C.,02 Life science Bldg | And 2 more authors.
Precision Agriculture | Year: 2010

The objective of this paper is to evaluate Cotton, Gossypium hirsutum L. yield as affected by early season pests infesting alluvial soil within the Commerce-Bruin-Dundee soil series in Louisiana, USA. Novel methodology helped determine the effect of nematicide and selected fertility management practices on cotton lint yield collected from research plots and an on-farm test. In the small plot research test, data collected for thrips, nematodes and yield is analyzed using geo-referenced data points. Yields were significantly better in fumigation and nematicide seed treatments as compared to the non-treated plus high fertility management strategy that contained 144 kg/ha N, but more variation in yield occurred in the fumigation treatment with lower fertility management. In an embedded field trial that included three fertility management strategies (96, 138, 162 kg/ha N) applied with and without fumigation, linear mixed models analysis of co-variance techniques resulted in prescriptions for site-specific management of fumigation and fertilizer whereas conventional analysis could not be used for site-specific management. © Springer Science+Business Media, LLC 2009.


Cook D.R.,Mississippi State University | Rogers Leonard B.,LSU AgCenter | Burris E.,Northeast Research Station | Gore J.,Mississippi State University
Journal of Cotton Science | Year: 2013

Studies conducted during 1996 through 1998 showed that the use of an at-planting insecticide significantly reduced densities of thrips (adults and immature) compared to the non-treated control. In these studies the use of an at-planting insecticide also resulted in significantly greater lint yield compared to the non-treated. Additional studies were conducted during 1999 and 2000 to determine how thrips infestations impact yield. Thrips densities were lower during 1999 and 2000 compared to those observed during 1996 through 1998. Fewer differences in thrips densities were observed between treated and non-treated plots. Analysis of yield components using plant mapping procedures did not detect any differences between the treated and non-treated plots and there were no significant differences in total yield observed. Results from these studies and previous studies indicate that environmental conditions might influence cotton response to thrips infestations. This interaction warrants further study. © The Cotton Foundation 2013.


Griffin J.L.,LSU AgCenter | Boudreaux J.M.,LSU AgCenter | Miller D.K.,Northeast Research Station
Weed Science | Year: 2010

Herbicides used as harvest aids are applied at crop maturity to desiccate weed and crop foliage. Weeds present in the harvested crop can increase moisture content and foreign material, reducing grade and market price. Weeds can also delay the harvest operation and reduce harvest efficiency. Glyphosate can be used to desiccate weeds in glyphosate-resistant crops without concern for crop injury. Carfentrazone and pyraflufen-ethyl used as harvest aids can be effective in desiccating broadleaf weeds in corn and soybean. Paraquat, although effective on grass and broadleaf weeds when applied late season, can cause significant crop injury if applied too early. With expanded production of early maturing soybean cultivars in the mid-South (Arkansas, Louisiana, Mississippi, Missouri bootheel, and west Tennessee), presence of green stems, green pods, or green leaf retention, or combinations of these at harvest has increased. Interest in harvest aids has shifted to use as a crop desiccant. Paraquat also is an effective soybean desiccant, but application timing differs for indeterminate and determinate cultivars. Paraquat applied after soybean seed reached physiological maturity reduced number of green stems, pods, and retained green leaves present, allowing harvest to proceed 1 to 2 wk earlier than nontreated soybean. Seed moisture, foreign material, and seed damage also were reduced when paraquat was applied. © 2010 Weed Science Society of America.

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