Tolerance of Early Maturing Corn (Zea mays) Hybrids to DPX-79406

1998 ◽  
Vol 12 (1) ◽  
pp. 41-46 ◽  
Author(s):  
Douglas J. Doohan ◽  
Jerry A. Ivany ◽  
Ronald P. White ◽  
William Thomas
Keyword(s):  
Zea Mays ◽  
Nova Scotia ◽  
Grain Yield ◽  
Prince Edward Island ◽  
Severely Injured ◽  
Corn Hybrids ◽  
Grain Yields ◽  
Early Maturing ◽  
Early Injury

The effect of DPX-79406 was evaluated on eight corn hybrids in 1993 and on 18 hybrids in 1994. Experiments were conducted each year at Charlottetown, Prince Edward Island, and Stewiacke, Nova Scotia. Corn tolerance was similiar between sites but varied from year to year with certain hybrids. Generally, tolerance was hybrid dependent. Most hybrids displayed chlorosis and stunting 7 days after treatment (DAT) but recovered quickly. Injury at 7 DAT ranged from 8 to 64%. Grain yield indicated that ‘Pickseed 2444,’ ‘Pioneer 3921,’ ‘Pioneer 3979,’ and ‘DK 302’ were tolerant to 25 g ai/ha of DPX-79406. Pioneer 3979 and Pickseed 2444 grain yields were reduced with DPX-79406 at 50 g/ha in 1 yr. ‘DK 291’ and ‘DK 235’ were severely injured both years and did not recover appreciably from early injury. Responses of ‘Pioneer 3984’ and ‘Pickseed 2477’ varied from year to year, and they were considered sensitive to DPX-79406. ‘Pioneer 3947,’ ‘Pioneer 3962,’ ‘Pickseed 2290,’ ‘Pickseed 2299,’ ‘DK 220,’ ‘G-4011,’ and ‘N0565’ were tested only 1 yr and were tolerant to both rates of DPX-79406.

scholarly journals INFLUÊNCIA DE FORMAS DE ADUBAÇÃO DE SEMEADURA NA PRODUTIVIDADE DE GRÃOS DE HÍBRIDOS DE MILHO

2019 ◽  
Vol 18 (1) ◽  
pp. 88-98
Author(s):  
GUSTAVO DE CARVALHO PERON ◽  
RENZO GARCIA VON PINHO ◽  
LUIZ ANTONIO YANES BERNARDO JÚNIOR ◽  
VANDER FILLIPE DE SOUZA ◽  
FRANCIELLY DE CÁSSIA PEREIRA ◽  
...  
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Fertilizer Application ◽  
Minas Gerais ◽  
Climatic Conditions ◽  
Joint Analysis ◽  
Crop Season ◽  
Corn Hybrids ◽  
Maize Hybrids ◽  
Grain Productivity

RESUMO - Entender como o manejo de aplicação de fertilizantes interfere no sistema produtivo é primordial para amanutenção do máximo aproveitamento da produtividade dos híbridos. Desta forma, o objetivo com este trabalho foiverificar a influência da forma de adubação de semeadura, feita a lanço ou localizada, na produtividade de grãos de 33híbridos comerciais de milho, em quatro diferentes safras agrícolas. Foram conduzidos quatro experimentos no municípiode Serra do Salitre, em Minas Gerais (MG), nos meses de novembro de 2015 e de 2016, janeiro e fevereiro de 2017 efevereiro de 2017. O delineamento experimental utilizado foi o de blocos completos casualizados com três repetições,com os tratamentos dispostos em esquema fatorial de 33 x 2, sendo 33 híbridos de milho e dois sistemas de adubação desemeadura: a lanço e localizada. Na análise conjunta da produtividade de grãos, ocorreram interações significativas entrehíbridos e safras, e também entre formas de adubação e safras. Apesar da interação significativa, o sistema de adubaçãolocalizada foi superior em ambas as safras avaliadas, considerando nível de significância de 5% pelo teste de Tukey.Mesmo com as condições climáticas menos favoráveis na segunda safra, a adubação localizada mostrou-se mais eficiente.Palavras-chave: adubação localizada, adubação a lanço, segunda safra, Zea mays L.EFFECT OF SOWING FERTILIZATIONON GRAIN PRODUCTIVITY OF MAIZE HYBRIDSABSTRACT - Understanding how the management of fertilizer application affects the production system is essentialto maximize the productivity of the hybrids. The objective of this study was to verify the effect of broadcasting andbanding fertilization on grain yield of 33 commercial maize hybrids in four different crop seasons. Four experimentswere carried out in Serra do Salitre, state of Minas Gerais, Brazil, in November 2015, November 2016, January andFebruary 2017. The experimental design was a randomized complete block with three replications, with treatmentsarranged in a 33 x 2 factorial scheme, 33 corn hybrids and two sowing fertilization forms, broadcast and bandapplication. The joint analysis of grain yield showed significant interactions between hybrids and crop seasons, andalso between fertilization systems and crop seasons. The unfolding of the interaction between the fertilization formsand crop seasons showed that the yield of grains in the band fertilization was superior compared to the broadcastfertilization, regardless the crop season evaluated. Even with the less favourable climatic conditions in the secondharvest, the band fertilization showed to be more efficient when compared to the broadcast fertilization.Keywords: broadcast fertilizer, band fertilizer, second crop, Zea mays L.

scholarly journals Inheritance and combining ability study on drought tolerance and grain yield among early maturing inbred lines of maize (Zea mays L.)

2018 ◽  
Vol 10 (6) ◽  
pp. 115-127 ◽  
Author(s):  
Z. M. M. Issa ◽  
D. Nyadanu ◽  
A. Richard ◽  
A. R. Sangare ◽  
I. I. Adejumobi ◽  
...  
Keyword(s):  
Zea Mays ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Combining Ability ◽  
Zea Mays L ◽  
Inbred Lines ◽  
Early Maturing

Influence of Weed Control on Weed Population in Ridge-till Corn (Zea mays)

Weed Science ◽  
1996 ◽  
Vol 44 (4) ◽  
pp. 903-910
Author(s):  
Gail A. Wicks ◽  
Robert G. Wilson ◽  
Garold W. Mahnken ◽  
Gordon E. Hanson
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Field Studies ◽  
Grain Yields ◽  
Common Lambsquarters ◽  
Weed Population ◽  
Green Foxtail ◽  
Herbicide Treatments ◽  
Corn Grain

Field studies were conducted to determine the influence of annual herbicide treatments plus cultivation on weed populations and corn yields in ridge-till corn during a 3-yr period at Mitchell, NE, and a 7-yr period at North Platte, NE. When the experiment was initiated at North Platte, no weeds were present before corn planting. It took 4 yr before triazine-resistant kochia became a problem before corn planting in plots treated with atrazine, but these were controlled by other operations prior to corn harvest. In the cultivated check, green foxtail densities before harvest increased from 0 in 1985 to 32 plants 100 m−2in 1991. Annual applications of dicamba plus 2,4-D 10 d early preplant followed by cultivation controlled triazine-resistant kochia and velvetleaf, but common lambsquarters, nightshade species, and green foxtail increased. Volunteer corn was controlled with cultivation. After 3 yr at Mitchell, the annual weed population increased 10-fold in the cultivated check. Thus, corn yields were reduced 64% with two cultivations compared with an annual early preplant application of dicamba plus 2,4-D followed by alachlor plus cyanazine PRE and two cultivations. With two cultivations under low annual weed populations at North Platte, grain yield from the cultivated check treatment was not different from annual treatments of herbicides after 7 yr. Metolachlor plus atrazine occasionally caused a reduction in corn grain yields.

scholarly journals Incidence of corn stunt disease in off-season corn hybrids in different sowing seasons

2019 ◽  
Vol 54 ◽  
Author(s):  
Rodrigo Véras da Costa ◽  
Dagma Dionísia da Silva ◽  
Luciano Viana Cota ◽  
Leonardo José Motta Campos ◽  
Rodrigo Estavam Munhoz de Almeida ◽  
...  
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Marked Effect ◽  
Disease Incidence ◽  
Block Design ◽  
The State ◽  
Corn Hybrids ◽  
Corn Stunt ◽  
Randomized Complete Block Design ◽  
Sowing Season

Abstract: The objective of this work was to evaluate the incidence of corn stunt disease and its effects on the grain yield of off-season corn (Zea mays) hybrids in different sowing seasons. The experiment was conducted in three sites in the state of Tocantins, in different sowing seasons, in a randomized complete block design, with 30 hybrids (treatments) and three replicates. Corn stunt disease incidence was assessed at 80 days after emergence, varying between hybrids and sowing seasons, with a marked effect of sowing season. The most resistant hybrids were: MG652 PW, Penta VIP, MG600 PW, NS90 PRO2, LG3040 VIP3, MG580 PW, and Defender VIP. The Fórmula VIP2 hybrid was the most susceptible to corn stunt disease. The incidence of the disease increased in the later sowing seasons, causing significant declines in grain yield. The most productive hybrids were: MG580 PW, SYN 5T78 VIP, 2B810 PRO, MG600 PW, Supremo VIP, 2B512 PW, NS92 PRO2, P30S31 VYH, MG652 PW, Penta VIP, SX5371 VIP3, and LG6036 PRO. Corn hybrids vary greatly in their resistance to corn stunt disease, and, the later the sowing season, the higher the disease incidence and the lower the grain yield.

Methods of Measuring the Impact of the XA17 Gene on Imazethapyr Injury in Corn (Zea mays)

1995 ◽  
Vol 9 (4) ◽  
pp. 676-681 ◽  
Author(s):  
Randall S. Currie ◽  
David L. Regehr
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Dose Response ◽  
Photosynthetically Active Radiation ◽  
Treatment Plant ◽  
Response Curves ◽  
Corn Hybrids ◽  
Active Radiation ◽  
Sensitive Index ◽  
The Impact

Imazethapyr dose response curves were developed under laboratory and field conditions with the imazethapyr-resistant and -susceptible corn hybrids Pioneer 3180IR, IR denoting a hybrid homozygous for the XA17 gene conferring resistance to imazethapyr, and normal Pioneer 3180, respectively, and their F1progeny to establish methods of measuring the presence of the XA17 gene and quantifying its impact. At two field locations, absorption of photosynthetically active radiation was a sensitive index of corn injury caused by imazethapyr. Imazethapyr, at 35 g/ha (one half the labeled rate), reduced absorption of photosynthetically active radiation in Pioneer 3180 by 8.3% at 1 wk after treatment. Plant height also was a sensitive index of injury. The minimum rate at which imazethapyr injury was detected in the Pioneer 3180IR/Pioneer 3180 F1hybrid differed with location. Pioneer 3180IR was not injured by 280 g/ha of imazethapyr. The Pioneer 3180IR/3180 F1hybrid was injured slightly by imazethapyr at 140 g/ha, but recovered within 5 wk after treatment, and grain yield was not reduced by 280 g/ha of imazethapyr. A seedling assay reliably detected differences between progeny of Pioneer 3180IR and Pioneer 3180IR/3180 F1.

scholarly journals Effect of citric acid on the proteolytic activity of Zea mays L.

2011 ◽  
Vol 35 (5) ◽  
pp. 908-915 ◽  
Author(s):  
Mauro Manuel Martinez-Pacheco ◽  
Alberto Flores-Garcia ◽  
Eulalio Venegas-Gonzalez ◽  
Mario Alberto Cepeda-Villegas
Keyword(s):  
Zea Mays ◽  
Citric Acid ◽  
Grain Yield ◽  
Proteolytic Activity ◽  
Soluble Protein ◽  
Serine Proteases ◽  
Zea Mays L ◽  
Flag Leaf ◽  
Corn Hybrids ◽  
Physiological Maturity

Hybrids of Zea mays L. (Buffalo, Falcon, H360 y HV313) were treated with citric acid (2000 ppm). Grain yield, soluble protein and proteolytic activity were monitored when the crop reached physiological maturity. Citric acid was applied before the appearance of the flag leaf, and induced an increase in the grain yield from 4222 to 5780 kg/ha, in the soluble protein from 6.34 to 7.91 mg/mg and into the proteolytic activity from 14.3 to 65.7 µU mg prot-1. This is an increase of 2 to 12 times in the Falcon, H360 and HV313 hybrids, while the Buffalo hybrid responded with less intensity to the treatment with citric acid. In the H360 hybrid treated with citric acid, an increase in the proteolytic activity of aspartyl serine proteases was observed. The results indicate that citric acid differentially induces proteolytic activity and vigor in the corn hybrids analyzed.

Annual Grass Control in Corn (Zea mays) with Primisulfuron Combined with Nicosulfuron

1997 ◽  
Vol 11 (1) ◽  
pp. 171-175 ◽  
Author(s):  
Thomas L. Rabaey ◽  
R. Gordon Harvey
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Annual Grass ◽  
Grain Yields ◽  
Proso Millet ◽  
Field Corn ◽  
Giant Foxtail ◽  
Woolly Cupgrass ◽  
Corn Grain ◽  
Corn Grain Yield

Efficacy of primisulfuron and reduced rates of nicosulfuron on woolly cupgrass, wild-proso millet, and giant foxtail in field corn was evaluated in 1994 and 1995. Nicosulfuron was applied at 18, 27, and 36 g ai/ha alone and with 20 g ai/ha primisulfuron. Woolly cupgrass control from nicosulfuron at 18 and 27 g/ha was less than control from 36 g/ha (79% and 84% vs. 90%, respectively). Woolly cupgrass control was 5% greater when primisulfuron was combined with nicosulfuron at 27 and 36 g/ha than when nicosulfuron was applied alone. Corn grain yields were similar among all nicosulfuron plus primisulfuron treatments applied to control woolly cupgrass in 1994. In 1995, corn grain yield was increased 900 kg/ha when primisulfuron was combined with nicosulfuron at 18 g/ha compared to nicosulfuron applied at the same rate alone. Wild-proso millet control 3 WAT with nicosulfuron at 18 g/ha was less than control with nicosulfuron at 36 g/ha. Wild-proso millet control 8 WAT with nicosulfuron alone was greater than when nicosulfuron at any rate was applied with primisulfuron. No differences in corn grain yields were observed across nicosulfuron rates or combinations with primisulfuron to control wild-proso millet either year. Giant foxtail control and corn grain yield were not affected by nicosulfuron rate or combined applications of nicosulfuron and primisulfuron either year.

Cultivation and Herbicides for Weed Control in Corn

Weed Science ◽  
1968 ◽  
Vol 16 (2) ◽  
pp. 232-234 ◽  
Author(s):  
K. P. Buchholtz ◽  
R. E. Doersch
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Weed Control ◽  
Corn Yield ◽  
Triazine Herbicides ◽  
Grain Yields ◽  
Yield Increase ◽  
Weed Growth ◽  
Corn Grain ◽  
Corn Grain Yield

Corn (Zea mays L.) plots receiving broadcast spray applications of triazine herbicides without cultivation yielded as much as plots receiving the standard two cultivations for weed control. One cultivation resulted in an average 6% increase in corn grain yield on herbicide treated plots. This yield increase probably was due to improved weed control. Weed growth reduced grain yields an average of 1.23 bu/A for each 100 lb/A of dry weeds. In some experiments, increases in corn yield due to improved weed control by cultivation on plots treated with herbicides were less than increases expected based on weed growth reductions. This disparity may have been due to injury to the corn by cultivation.

scholarly journals Performance of Twelve Corn Hybrids and Selections in Three Consecutive Crops on the Same Site in the Same Year.

1969 ◽  
Vol 63 (2) ◽  
pp. 170-179
Author(s):  
A. Sotomayor-Ríos
Keyword(s):  
Zea Mays ◽  
Puerto Rico ◽  
Zea Mays L ◽  
Average Height ◽  
Average Yield ◽  
Bipolaris Maydis ◽  
Corn Hybrids ◽  
F1 Hybrid ◽  
Soil Disinfestation ◽  
Grain Yields

Twelve corn (Zea mays L.) hybrids and selections were planted three times on the same site in the same year at Isabela, Puerto Rico, according to the following schedule: Nov. 5, 1975 (crop 1); April 21, 1976 (crop 2); and Aug. 13, 1976 (crop 3). Average time to midsilk for the 12 entries was similar in crops 1 and 3 (621 and 6 1.6 days, respectively) but was shorter in crop 2 (59.1 days). Average height to the base of the lowest ear for the 12 entries was 87.1, 106.3, and 99.0 cm for crops 1, 2, and 3, respectively. Average test weight was highest (81.2 kg/hl) in crop 1, decreasing to 72.4 and 55.0 kg/hl in crops 2 and 3, respectively. Average severity of leaf blight, caused by Bipolaris maydis (Nisikado) Shoemaker, was similar in crops 1 and 2. Tne best grain yielder in all three crops was hybrid Pioneer 304 C, with yields of 5,975, 4,103, and 3,729 kg /ha in crops 1, 2, and 3, respectively. The average yield for the 12 entries was 4,598, 3,180, and 2,523 kg/ha in crops 1, 2, and 3, respectively. Nematodes in plots were counted and identified after crop 3 was harvested. The nematode most commonly found in the rhizosphere was Pratytenchus zeae. Plots with Pioneer 304 C, the top yielder, had the second lowest nematode count, 480 per 250 cm3 of soil. Plots with PR-3 and the F1 hybrid PRMo2 x PR-3 had the highest nematode counts, 1040 and 1232 per 250 cm3 of soil, respectively. Although soil disinfestation might have resulted in higher yields, this study showed that three corn crops grown on the same site during the same year can produce grain yields of more than 13,000 kg/ha (205 bu/acre).

scholarly journals Heterosis and genetic distance in intervarietal corn hybrids

2019 ◽  
Vol 54 ◽  
Author(s):  
Diego Baretta ◽  
Maicon Nardino ◽  
Ivan Ricardo Carvalho ◽  
Alan Junior de Pelegrin ◽  
Mauricio Ferrari ◽  
...  
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Genetic Distance ◽  
Grain Weight ◽  
Corn Hybrids ◽  
Per Se ◽  
Genetic Dissimilarity ◽  
Topcross Hybrids

Abstract: The objective of this work was to evaluate the performance of intervarietal corn (Zea mays) hybrids with topcross crosses between landrace populations, and to confirm whether genetic dissimilarity between populations is correlated with the heterosis of the intervarietal hybrids in the field. Nine topcross hybrids were evaluated with their tester 'BRS Planalto', and the following landrace populations were used as parents: Argentino Branco, Dente de Ouro, Amarelão, Criolão, Caiano Rajado, Branco Oito Carreiras, Branco Roxo Índio, Cateto Branco, and Argentino Amarelo. The tester 'BRS Planalto' and the topcross hybrids Branco Oito Carreiras x 'BRS Planalto' and Criolão x 'BRS Planalto' showed higher per se potential for grain yield. The topcross hybrid Branco Oito Carreiras x 'BRS Planalto' showed a better performance for number of grains per row, grain weight, and ear diameter, whereas Criolão x 'BRS Planalto' displayed a better performance for the number of grains per row and ear length. Greater estimates of genetic distance did not necessarily result in greater heterosis values and were exclusively correlated with grain ear length. Therefore, it is not possible to predict the effects of high heterosis on grain yield, based on the genetic distance between the populations involved in the crosses.

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