Influence of Post Emergence Application of K Salt of Glyphosate on Weed Control and Yield of Transgenic Stacked and Non Transgenic Maize Hybrids in Summer Irrigated Eco systems of Tamil Nadu

Six corn hybrids were studied in field experiments in 1989 and 1990 to identify hybrids and corn plant characteristics that may be valuable in systems using reduced levels of weed control. Four weed control treatments (no-control, cultivation-only, band herbicide-plus-cultivation, and broadcast herbicide) represented main plots and maize hybrids were subplots. Medium-season hybrids with differences in height, early-season vigor, and leafiness were used. There were significant differences among hybrids in leaf angle, leaf width, leaf number, plant height, leaf area index (LAI), plant dry matter (DM) and grain and stover yields. Lower yielding hybrids had grain yields that ranged from 87 to 91% of the highest yielding hybrid. Aboveground corn characteristics were not correlated with weed numbers, weed cover, or weed biomass. A significant interaction between hybrid and weed control for grain yields was observed in 1989, suggesting that some hybrids are more competitive when weed pressure is high.

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Optimization of Spray Fluid for Herbicide Application for Drones in Irrigated Maize (Zea mays L.)

International Journal of Plant & Soil Science ◽

10.9734/ijpss/2021/v33i2130665 ◽

2021 ◽

pp. 137-145

Author(s):

C. Supriya ◽

P. MuraliArthanari ◽

R. Kumaraperumal ◽

A. P. Sivamurugan

Keyword(s):

Zea Mays ◽

Weed Control ◽

Tamil Nadu ◽

Zea Mays L ◽

Block Design ◽

Herbicide Application ◽

Recommended Dosage ◽

Control Efficiency ◽

Randomized Complete Block Design ◽

Weed Control Efficiency

A field experiment was conducted in a randomized complete block design to screen the optimum spray fluid of herbicide application for drone based on visual toxicity and weed control efficiency in maize (Zea mays L.) during the summer season (March 2021) at eastern block farms of Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu. Three herbicide treatments namely Atrazine, Tembotrione and 2, 4-D with recommended dosages, 75% and 125% as pre-emergence herbicides applied on 3 days after, early post-emergence herbicides applied on 15 days after sowing and post-emergence applied on 25 days after sowing respectively. Totally thirty treatments with different spray fluids such as 500, 400, 300, 200, 100, 80, 60, 40, 30 L ha-1 and 20 L ha-1 were replicated three times. The study revealed that T5- Recommended dosage of pre emergence Atrazine – early post emergence Tembotrione – post emergence 2, 4-D (spray fluid 100 L of water ha-1),T6- Recommended dosage of pre emergence Atrazine – early post emergence Tembotrione–post emergence 2, 4-D (spray fluid 80 L of water ha-1), T7- Recommended dosage of pre emergence Atrazine – early post emergence Tembotrione – post emergence 2, 4-D (spray fluid 60 L of water ha-1) and T8- Recommended dosage of pre emergence Atrazine – early post emergence Tembotrione – post emergence 2, 4-D (spray fluid 40 L of water ha-1) produced the best results with respect to phytotoxicity and weed control efficiency. Based on the results it was concluded that the application of spray fluid 80 L ha-1 was optimum for herbicide application through drones with recommended dosage pre emergence Atrazine 1 kg a.i ha-1 on 3 days after sowing – early post emergence Tembotrione 120 g a.i ha-1 on 15-20 days after sowing - post emergence 2, 4-D 1 kg a.i ha-1 on 30 - 35 days after sowing.

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Weed Control in Maize with Gliricidia Intercropping

Planta Daninha ◽

10.1590/0100-83582015000200010 ◽

2015 ◽

Vol 33 (2) ◽

pp. 249-258

Author(s):

L.B. Tavella ◽

P.S.L. Silva ◽

A.L. Monteiro ◽

V.R. Oliveira ◽

P.L.O.F. Siqueira

Keyword(s):

Grain Yield ◽

Weed Control ◽

Weed Management ◽

Gliricidia Sepium ◽

Good Alternative ◽

Production Costs ◽

Integrated Weed Management ◽

Maize Production ◽

Maize Hybrids ◽

Weed Growth

One of the very important components in the organic maize production costs refers to spending on weed control. In this research were assessed the effects of maize hybrids (AG 1051 and BR 205) in an intercropping with Gliricidia (Gliricidia sepium) and mechanical hoeing on weed control. The treatments assessed were: A - maize monocropping + two hoeings (20 and 40 days after sowing); B - maize with one hoeing at 20 days + intercropping with gliricidia sowed after hoeing; C - maize sowing intercropped with gliricidia at the time of maize sowing + hoeing at 40 days; D - maize sowing intercropped with gliricidia at the time of maize sowing without hoeing; E - monocropping maize without hoeing. In the intercroppings, gliricidia was sowed in broadcast seeding with 30 viable seeds m-2. Maize hybrids did not differ in their effects on weed growth and grain yield. Treatments A, B and C have reduced weed growth, compared to treatments D and E. The highest grain yield was obtained with treatment A and the lowest with treatment E. It was concluded that intercropping maize and gliricidia is not a good alternative for an integrated weed management in maize crops in the conditions assessed.

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Interaction between maize phenology and transgenic maize hybrids on stalk rots following European corn borer infestation

African Journal of Plant Science ◽

10.5897/ajps11.245 ◽

2011 ◽

Vol 5 (15) ◽

Author(s):

Motshwari Obopile

Keyword(s):

European Corn Borer ◽

Transgenic Maize ◽

Corn Borer ◽

Maize Hybrids

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ARE GLYPHOSATE AND GLUFOSINATE-AMMONIUM TOTALLY SELECTIVE FOR TRANSGENIC MAIZE CONTAINING THE CP4-EPSPS AND PAT GENES?

Revista Brasileira de Milho e Sorgo ◽

10.18512/rbms2020v19e1154 ◽

2020 ◽

Vol 19 ◽

pp. 14

Author(s):

FÁBIO HENRIQUE KRENCHINSKI ◽

BRUNO FLAIBAM GIOVANELLI ◽

ALFREDO JUNIOR PAIOLA ALBRECHT ◽

LEANDRO PAIOLA ALBRECHT ◽

VINICIUS GABRIEL CANEPPELE PEREIRA ◽

...

Keyword(s):

Seed Germination ◽

Plant Height ◽

Weed Control ◽

Block Design ◽

Transgenic Maize ◽

Yield Losses ◽

Glufosinate Ammonium ◽

Randomized Block Design ◽

Cp4 Epsps

required. Maize with cp4-epsps and pat genes is tolerant to glyphosate and glufosinate-ammonium herbicides and has been a tool used for weed control. However, there is a demand for new studies to assess how tolerant it is and to avoid yield losses. The objective of this study was to assess the selectivity of the 2B810PW hybrid, which has the cp4-epsps and pat genes, subjected to applications of glyphosate (gly) and glufosinate-ammonium (glu), both isolated and combined, at two different rates, during three crop years, in two municipalities in Paraná state. A randomized block design, with four replications, was used. Some measured variables, such as plant height, showed few differences between crop years and locations, while others, like percentage of seed germination and yield, showed no differences (P ≤ 0.05). This demonstrates that the hybrid is resistant to the application of glufosinate-ammonium and glyphosate herbicides, isolated or combined, and these molecules can provide more options for weed control in crops of maize containing the cp4-epsps and pat genes.

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Evaluation of New Herbicide Molecules on Sustainable Weed Management in Transplanted Rice

Madras Agricultural Journal ◽

10.29321/maj.04.000415 ◽

2017 ◽

Vol 104 (4 - 6) ◽

Author(s):

Deiveegan M ◽

◽

Muralikrishnasamy S ◽

Ravichandran S ◽

◽

...

Keyword(s):

Weed Control ◽

Weed Management ◽

Tamil Nadu ◽

Field Experiments ◽

Clay Loam ◽

Control Efficiency ◽

Transplanted Rice ◽

Breeding Station ◽

Weed Control Efficiency ◽

Hand Weeding

Field experiments were conducted during Rabi 2014, at Paddy Breeding Station, Tamil Nadu Agricultural University, Coimbatore to study the effect of pre-emergence / early post emergence herbicides along with hand weeding options on weed control in transplanted rice. The soil of the experimental field was clay loam in texture with pH 8.23. The performance of different pre-emergence application of butachlor 50% EC 1.5 kg a.i. ha-1, flucetosulfuron 10% WG in two doses at 20 g a.i ha-1 and 25 g a.i ha-1, pyrazosulfuron-ethyl 10% WB 75 g a.i ha-1, early post emergence application of penoxsulam + cyhalofop-butyl in two doses at 120 g a.i ha-1 and 135 g a.i. ha-1, bispyribac sodium 10% SC 35 g a.i ha-1 were evaluated along with pre-emergence application of pretilachlor 50% EC 1.0 kg a.i ha-1 + HW at 45 DAT, butachlor 50% EC 1.0 kg a.i ha-1 + HW at 45 DAT in comparison with hand weeding twice at 20 and 40 DAT, unweeded control and weed free check. The test variety used in this experiment was Co (R) 50. The experimental results revealed that weed free check had 100% weed control efficiency (WCE) in all the stages of crop growth. Among the various treatments tested, At 90 DAT, weed control efficiency (WCE) was maximum with early post emergence application of penoxsulam + cyhalofop-butyl135 g a.i. ha-1 (T5) recorded the maximum weed control efficiency of 85.78%. The number of productive tillers m-2 recorded ranged between 441 in T5 and 295 in unweeded control (T11). Grain yield ranged between 7717 kg ha-1 in weed free check (T12) and 5194 kg ha-1 in unweeded control (T11). The maximum straw yield of 9277 kg ha-1 was recorded in weed free check (T12). This was on par with early post emergence application of penoxsulam+ cyhalofop-butyl 135 g a.i. ha-1 (T5) and hand weeding twice at 20 and 40 DAT (T10) with 9206 kg ha-1 and 9019 kg ha-1.

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