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).

RECENT ADVANCES IN MATURITY AND YIELD OF GRAIN CORN HYBRIDS TESTED IN THE MARITIMES

1989 ◽  
Vol 69 (4) ◽  
pp. 1259-1263
Author(s):  
R. P. WHITE ◽  
K. B. McRAE
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Considerable Improvement ◽  
Yield Potential ◽  
Average Yield ◽  
Maritime Provinces ◽  
Corn Hybrids ◽  
Yield Improvement ◽  
Hybrid Corn ◽  
Harvest Maturity

Hybrids evaluated in six regional grain corn (Zea mays L.) trials in the Maritime Provinces of Canada showed considerable improvement in at-harvest grain maturity and some yield improvement between 1981 and 1987. After adjusting for changes in at-harvest maturity between 1981 and 1987, the average yield potential had increased by 4.4% (SE = 1.96). The improvement in at-harvest maturity was on average 3.7% (SE = 0.82), after adjusting for changes in yield, but was greater for hybrids with less than average yield.Key words: Zea mays L., hybrid corn, maturity, yield, hybrid evaluation

scholarly journals Corn Variety Trials on a Eutrustox in Puerto Rico

1969 ◽  
Vol 66 (3) ◽  
pp. 223-234
Author(s):  
G. L. Spain ◽  
S. P. Nightengale ◽  
J. Badillo-Feliciano
Keyword(s):  
Zea Mays ◽  
Puerto Rico ◽  
Zea Mays L ◽  
Northwest Coast ◽  
Grain Yields ◽  
Variety Trials ◽  
Fourth Trial ◽  
Agricultural Experiment

Four corn (Zea mays L.) variety trials were conducted during 1976-78 at the Isabela Agricultural Experiment Substation near the northwest coast of Puerto Rico. The Pioneer brand hybrid X304C ranked highest in three experiments with yields of 9, 782, 3,962 and 8,998 kg/ha of 15.5%-moisture grain, and was second only to X5800 (6,559 kg/ha) in a fourth trial with 5,856 kg/ ha. Other leading hybrids were X304A, X304B, X306B, X105A, H638 and H652. While certain hybrids and local open pollinated varieties yielded significantly less, grain yields among the top ranked entries in each experiment were not significantly different.

Improved photosynthetic characteristics correlated with enhanced biomass in a heterotic F1 hybrid of maize (Zea mays L.)

2021 ◽  
Author(s):  
Rajesh Kumar Meena ◽  
Kanubothula Sitarami Reddy ◽  
Ranjana Gautam ◽  
Surender Maddela ◽  
Attipalli Ramachandra Reddy ◽  
...  
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Photosynthetic Characteristics ◽  
F1 Hybrid

scholarly journals Effect of salt stress on some sweet corn (Zea mays L. var. saccharata) genotypes

2015 ◽  
Vol 67 (3) ◽  
pp. 993-1000 ◽  
Author(s):  
Lydia Shtereva ◽  
Roumiana Vassilevska-Ivanova ◽  
Tanya Karceva
Keyword(s):  
Zea Mays ◽  
Salt Stress ◽  
Zea Mays L ◽  
Sweet Corn ◽  
Growth Parameters ◽  
Dry Weight ◽  
Germination Percentage ◽  
F1 Hybrid ◽  
Salt Stress Condition ◽  
Salinity Levels

An experiment was carried out hydroponically under laboratory conditions to investigate the effect of salt stress on several physiological and biochemical parameters of three sweet corn (Zea mays L. var. saccharata) genotypes: lines 6-13, C-6 (pollen source) and their heterotic F1 hybrid ?Zaharina?. The degree of salinity tolerance among these genotypes was evaluated at three different sodium chloride (NaCl) concentrations: 0 mM, 100 mM, 125 mM and 150 mM. Seed germination, plant growth and biochemical stress determining parameters such as malondialdehyde (MDA), proline content and hydrogen peroxide (H2O2) levels were compared between seedlings of lines and hybrid. The obtained results indicated that both lines and hybrid have similar responses at different salinity levels for all examined traits. All the seedlings? growth parameters, such as germination percentage, root length, shoot length, root and shoot fresh and dry weight, decreased with increasing salinity level. MDA, proline and H2O2 increased at different saline conditions in comparison to the control. Based on the results, of the three genotypes examined, the hybrid Zaharina, followed by line C-6, was more salt-sensitive than line 6-13 in salt stress condition.

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 Identificación y caracterización del agente causal de la pudrición de la raíz y tallo del maíz (zea mays l.)

2017 ◽  
Vol 9 (1) ◽  
pp. 69
Author(s):  
Milly Minaya Huerta ◽  
Eusebio Reyes Huamán
Keyword(s):  
Zea Mays ◽  
Rhizoctonia Solani ◽  
Fusarium Moniliforme ◽  
Zea Mays L ◽  
Exserohilum Turcicum ◽  
Bipolaris Maydis ◽  
Nigrospora Oryzae

<p>El objetivo de la presente investigación fue identificar y caracterizar el agente causal de la pudrición de la raíz y el tallo del maíz. Se ejecutó en dos fases: en campo y en laboratorio. El muestreo se hizo en la provincia de Yungay, localidades de Mancos, Ranrahirca, Huarascucho, Yungay y Cañasbamba. La muestra fue de cinco parcelas por localidad, y cinco muestras por parcela; con un total de 125 muestras entre raíces y tallos; las muestras fueron procesadas mediante las técnicas de cultivo en medio Papa Dextrosa Agar Oxitetraciclina-PDAO. También se procesó semillas de maíz obtenidas de comerciantes con la técnica de cámara húmeda. Desarrolladas las colonias de hongos en el medio de cultivo PDAO se procedió a hacer montajes microscópicos de las estructuras y su caracterización e identificación haciendo uso de claves taxonómicas incluidas en la bibliografía. De las muestras de campo se aisló el hongo <em>Fusarium moniliforme </em>en 60%; también se aislaron <em>Exserohilum turcicum</em>, <em>Nigrospora oryzae</em>, <em>Rhizoctonia solani</em>, y otros hongos de menor importancia: <em>Phoma </em>sp<em>, Penicillium </em>sp<em>, </em>y <em>Bipolaris maydis</em>. En las muestras de semillas se encontró: <em>Cladosporium </em>sp. 53 %, <em>Fusarium moniliforme </em>35%, <em>Phoma </em>sp. 35 %, y <em>Fusarium </em>sp<em>. </em>9%, Concluimos que <em>Fusarium moniliforme </em>es el agente causal principal de la pudrición de la raíz y tallo del maíz en el Callejón de Huaylas.</p>

scholarly journals Nitrogen fertilizer rate for improving inbred maize (Zea mays L.) yield on the semi-arid southern coast of Puerto Rico

2017 ◽  
Vol 101 (2) ◽  
pp. 185-202
Author(s):  
Johanie Rivera-Zayas ◽  
David Sotomayor-Ramírez ◽  
Ricardo Barnes
Keyword(s):  
Zea Mays ◽  
Puerto Rico ◽  
Grain Yield ◽  
Plant Height ◽  
Cover Crop ◽  
Crop Production ◽  
Zea Mays L ◽  
Plant Density ◽  
Fertilizer N ◽  
Semi Arid

Nitrogen (N) is possibly the most limiting nutrient for crop production on the southern semi-arid coast of Puerto Rico. In efforts to improve inbred maize (Zea mays L.) grain yield, fertilizer N is sometimes aggressively managed. In this paper, we report on the results of a field experiment that evaluated the effect of six rates of fertilizer N (0, 34, 68,102,135 and 203 kg N/ha) and of cowpea (Vigna unguiculata cv. Iron-clay), planted as a cover crop during the offseason, on inbred maize grain yield. The soil was Jacaguas series (Loamy-skeletal, mixed, superactive, isohyperthermic Fluventic Haplustolls) on the Dow Agrosciences experimental farm in Santa Isabel, Puerto Rico. Cowpea was planted on 13 July 2013 and incorporated into the soil on 20 September 2013. An inbred maize line was planted on 19 December 2013 and harvested on 19 March 2014 at a plant density of 51,645 plants per hectare. Irrigation was provided via drip system, and fertilizer N was applied at three different stages during the growing season: at emergence, 21 and 37 days after planting. Measurements of plant height, chlorophyll readings using SPAD-502® and GreenSeeker®, and leaf N concentration were used as indicators of treatment response and N sufficiency. The maximum grain yield of 2,918 kg/ha was attained with the fertilizer N rate of 68 kg N/ha. The cowpea cover crop rotation did not affect grain yield (P>0.05). Plant height, and measurements by SPAD-502® and GreenSeeker® provided adequate indicators of crop N sufficiency during the vegetative stages V6 to V12, with optimum values of 149 cm, 46, and 0.67 NDVI, respectively, 52 days after planting with an application of 68 kg N/ ha. Crop response to fertilizer N occurred at a lower rate than in previous studies and those occurring under conventional commercial conditions. Other factors related to fertilizer N management, such as sources, placement and timing of application might be as important for grain yield improvement of inbred maize.

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.    

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