scholarly journals Spatial Modelling and Spread of Corn Stunt and Maize Bushy Stunt in Corn Hybrids (Zea mays)

2019 ◽  
Vol 3 (8) ◽  
pp. 126-132
Author(s):  
Érica de Castro Costa ◽  
Walter Baida Garcia Coutinho ◽  
Cleberly Evangelista dos Santos ◽  
Flavia Maria dos Santos ◽  
Karolinny de Souza Almeida ◽  
...  
Keyword(s):  
Zea Mays ◽  
Spatial Modelling ◽  
Corn Hybrids ◽  
Corn Stunt

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.

Differential Butylate Injury to Corn Hybrids

Weed Science ◽  
1973 ◽  
Vol 21 (3) ◽  
pp. 194-196 ◽  
Author(s):  
T. H. Wright ◽  
C. E. Rieck
Keyword(s):  
Zea Mays ◽  
South Carolina ◽  
Field Experiments ◽  
Laboratory Studies ◽  
Corn Hybrids ◽  
Corn Hybrid

Injury to corn (Zea maysL.) fromS-ethyl diisobutylthiocarbamate (butylate) was investigated with respect to hybrid. Field experiments in 1971 at Dillon and Clemson, South Carolina, established that the corn hybrid ‘Coker 71’ was more tolerant to butylate than ‘Pioneer 511A’. Also established as being tolerant and sensitive to butylate were the hybrids ‘Pioneer 3030’ and ‘PAG 644’, respectively. Laboratory studies with14C-butylate showed that the resistant hybrid ‘Pioneer 3030’ took up less14C-butylate and metabolized more to14CO2than did ‘PAG 644’.

scholarly journals DEVELOPMENT OF CORN HYBRIDS (Zea mays) UNDER INOCULATION OF DIAZOTROPHIC BACTERIA AND NITROGEN FERTILIZATION

2019 ◽  
Vol 17 (1) ◽  
pp. 71
Author(s):  
João Paulo Kruger Reznick ◽  
Volnei Pauletti ◽  
Daniel Malheiro Nascimento ◽  
Marcus Vinicius Cremonesi
Keyword(s):  
Zea Mays ◽  
Experimental Design ◽  
Factorial Design ◽  
Chlorophyll Content ◽  
Nitrogen Fertilization ◽  
Azospirillum Brasilense ◽  
Dry Mass ◽  
Diazotrophic Bacteria ◽  
Corn Hybrids ◽  
Leaf Chlorophyll

<br /><table class="data" width="100%"><tbody><tr valign="top"><td class="value">The aim of this work was to evaluate the development of corn genotypes under the effect of inoculation with <em>Azospirillum brasilense</em> in association with nitrogen fertilization. The experimental design was completely randomized in a factorial design (5x2x2) with three replications. Five corn hybrids were used, combined with two doses of nitrogen (N) (without N and with 100 kg ha<span>-1</span> N) and with two inoculation levels of <em>A.brasilense</em> (without and with inoculation). Plant stature and stem diameter at stadiums V8 and R1, leaf chlorophyll content at stadium R1 and dry mass at stadium R2 were evaluated. It was observed that when there was variation in the evaluated parameters, this was due to the different genetic materials and mainly due to the application of N. Inoculation with <em>A.brasilense</em> was not effective in altering the corn development.</td></tr></tbody></table>

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 Effect of different drip irrigation depths on the damage of Spodoptera frugiperda (Lepidoptera: Noctuidae) in corn hybrids (Zea mays L.)

2019 ◽  
Vol 11 (2) ◽  
pp. 42-47
Author(s):  
Iracema Raquel Santos BEZERRA ◽  
João Pedro Ferreira BARBOSA ◽  
Rafael Lima Vieira dos SANTOS ◽  
Rafael de Almeida LEITE ◽  
Dacio Rocha BRITO ◽  
...  
Keyword(s):  
Zea Mays ◽  
Spodoptera Frugiperda ◽  
Drip Irrigation ◽  
Zea Mays L ◽  
Corn Hybrids ◽  
Lepidoptera Noctuidae

O milho (Zea mays L.) é uma das culturas de maior importância econômica mundial, entretanto, existem locais com baixos índices pluviométricos que deixam essa cultura sujeita ao déficit hídrico. Para amenizar este problema usa-se irrigação, podendo-se citar a de gotejamento como mais eficiente. No entanto, pragas diminuem a produtividade dessa cultura, principalmente a Spodoptera frugiperda. Assim, à medida que novos híbridos são produzidos, surge a carência de analisar a suscetibilidade deles às pragas. Com isso, objetivou-se neste trabalho, analisar o efeito da aplicação de irrigação por gotejamento em diferentes lâminas nos danos de S. frugiperda em híbridos de milho. A pesquisa foi realizada no Polo Tecnológico Agroalimentar de Arapiraca, com semeadura manual com 5 linhas de 5 m por parcela, sendo essas linhas separadas 0,80 m entre as mesmas e 0,10 m entre plantas. O delineamento experimental foi em blocos casualizados com três repetições dispostas em arranjo fatorial 4x3. Foram avaliadas todas as plantas das parcelas, exceto da bordadura. Os dados foram transformados em √x e submetidos a ANOVA pelo teste F no software SISVAR, havendo significância, realizou-se teste de Tukey e regressão linear. Somente os híbridos diferiram pelo teste F entre os tratamentos, o híbrido Janor foi o que obteve menor média de dano. Conclui-se que houve diferença significativa quantos aos danos de S. frugiperda em híbridos, todavia não foi encontrada diferença entre as lâminas de irrigação por gotejamento nem sua interação com os híbridos.

scholarly journals Tolerance of Eight Sweet Corn (Zea mays L.) Hybrids to Pyroxasulfone

HortScience ◽  
2008 ◽  
Vol 43 (1) ◽  
pp. 170-172 ◽  
Author(s):  
Sarah R. Sikkema ◽  
Nader Soltani ◽  
Peter H. Sikkema ◽  
Darren E. Robinson
Keyword(s):  
Zea Mays ◽  
Plant Height ◽  
Weed Management ◽  
Zea Mays L ◽  
Sweet Corn ◽  
Corn Hybrids ◽  
Field Corn

Pyroxasulfone is an experimental herbicide for use in field corn (Zea mays L.) and soybean that may have potential for weed management in sweet corn. Tolerance of eight sweet corn hybrids to pyroxasulfone applied preemergence (PRE) at rates of 0, 209, and 418 g·ha−1 a.i. were studied at two Ontario locations in 2005 and 2006. Pyroxasulfone applied PRE at 209 and 418 g·ha−1 caused minimal (less than 3%) injury in Harvest Gold, GH2041, GH9589, GSS9299, GG214, GG446, GG763, and GG447 sweet corn hybrids at 7, 14, and 28 days after emergence. Pyroxasulfone applied PRE did not reduce plant height, cob size, or yield of any of the sweet corn hybrids tested in this study. Based on these results, pyroxasulfone applied PRE at the rates evaluated can be safely used for weed management in Harvest Gold, GH2041, GH9589, GSS9299, GG214, GG446, GG763, and GG447 sweet corn.

scholarly journals Seed yield of simple and tri-linear corn (Zea mays L.) hybrids for the mexican humid tropics

2021 ◽  
Vol 70 (2) ◽  
Author(s):  
Mauro Sierra Macías ◽  
Flavio A. Rodríguez Montalvo ◽  
Alejandro Espinosa Calderón ◽  
Margarita Tadeo Robledo ◽  
Noel Orlando Gómez Montiel ◽  
...  
Keyword(s):  
Zea Mays ◽  
Seed Yield ◽  
Zea Mays L ◽  
Block Design ◽  
Female Parent ◽  
Initial Population ◽  
Corn Hybrids ◽  
Randomized Block Design ◽  
Seed Yields ◽  
Genetic Combination

The objective of the work was to evaluate the agronomic performance and seed yield of tropical corn (Zea mays L.) of single and tri-linear crosses. In the spring-summer of 2015 and 2016, two essays were established in the states of Veracruz and Tabasco, Mexico. In the first essay, a group of 12 single crosses was evaluated, and in the second, a group of 18 tri-linear crosses was evaluated. In both essays, the treatments were distributed under a completely randomized block design with three replicates in 5 m long, two-row plots and 0.8 m between rows, with an initial population density of 62.500 plants ha-1. Within the simple cross trial, hybrids HE-3W, COMERCIAL 1, LT-164xLT-165, and HE-1W presented seed yields above the general mean (3384 kg ha-1). Within this outstanding group is the LT-164xLT-165 cross, which participates as a female parent in the formation of the recently released commercial hybrid H-567. In the tri-linear crosses essay, a group of varieties and hybrids including H-567, (LT-164xLT-165) xLT-156, (LT-164xLT-165) xLT-155, (LT-154xLT-155) xLT-165, VS-536, H-520, VS-563, (LT-154xLT-155) xLT-170, (LT-171xLT-172) xLT-156, (LT-164xLT-165) xLT-164, and (LT-171xLT-172) xLT-170 recorded seed yields of 6669.8, 6515.4, 6498.6, 6431.1, 6260, 6024.7, 5935.4, 5664.3, 5580.8, and 5527.1 kg ha-1, respectively. The LT-154, LT-155, and LT-156 lines are common as a male and female parent, suggesting a good genetic combination. The prevailing environmental conditions during the development of the experiments did not significantly influence the productivity of the crosses. There is genetic variability that can be used to continue developing lines, open pollination varieties, and corn hybrids.    

Tolerance of Corn (Zea mays) Lines to Clomazone

Weed Science ◽  
1989 ◽  
Vol 37 (4) ◽  
pp. 622-628 ◽  
Author(s):  
David W. Keifer
Keyword(s):  
Zea Mays ◽  
Growth Temperature ◽  
Limited Range ◽  
Soil Composition ◽  
Corn Hybrids ◽  
Absolute Level ◽  
Relative Tolerance ◽  
The Absolute ◽  
Susceptible Group ◽  
Single Symmetrical Peak

Corn hybrids and inbreds were ranked for their relative tolerance to soil-incorporated clomazone, as assessed by the level of discoloration injury in the greenhouse. Inbred W117 was the most tolerant corn line tested. Some corn lines were affected similarly by clomazone. Inbred A619 was in the most susceptible group. Clomazone injury to A619 (susceptible) and W117 (tolerant) corn was similar when the clomazone rate was 10-fold greater on W117 than on A619. The distribution of corn lines on a sensitivity scale was of limited range; the distribution of hybrids on this scale was a single symmetrical peak. Changing the growth temperature or soil composition would change the absolute level of corn injury caused by a rate of clomazone but did not change the relative ranking of the corn lines in the test. A subset of the greenhouse-tested corn lines also was evaluated in several field locations. The tolerance of corn in a given field was highly (P<0.005) correlated with tolerance in the greenhouse; however, the absolute levels of injury differed among locations. The tolerance of- hybrids of known pedigree was highly (P<0.0002) correlated with the tolerance of the parent inbreds, indicating this trait was inherited.

Magnitude of Imazethapyr Resistance of Corn (Zea mays) Hybrids with Altered Acetolactate Synthase

Weed Science ◽  
1995 ◽  
Vol 43 (4) ◽  
pp. 578-582 ◽  
Author(s):  
Randall S. Currie ◽  
Chae S. Kwon ◽  
Donald Penner
Keyword(s):  
Zea Mays ◽  
Resistance Gene ◽  
Laboratory Study ◽  
Acetolactate Synthase ◽  
Corn Hybrids ◽  
The Public ◽  
Field Corn

A laboratory study was conducted to evaluate the magnitude of imazethapyr resistance of field corn hybrids with altered acetolactate synthase (ALS) by comparing the responses of ALS extracted from homozygous and heterozygous resistant corn to nicosulfuron, primisulfuron, and imazethapyr. ALS isolated from Pioneer 3162 IR, Pioneer 3180 IR, Pioneer 3377 IR, and Ciba 4393 RSC hybrids was much more resistant to inhibition by these herbicides than ALS from the hybrids Pioneer 3162, Pioneer 3180, Pioneer 3377, and Ciba 4393, and the public inbred LH 74. Corn hybrids heterozygous for the Pioneer resistance gene were intermediate in response to the herbicides. ALS from ICI 8532 IT was resistant to imazethapyr but not to primisulfuron or nicosulfuron. The level of resistance of ALS from ICI 8532 IT was similar to that of ALS from Pioneer 3162 IR x Pioneer 3162 and Pioneer 3180 IR x Pioneer 3180 crosses that were also heterozygous for the resistance gene.

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