THE RESPONSE OF EIGHT CORN (Zea mays L.) HYBRIDS TO ZERO TILLAGE IN MANITOBA

1983 ◽  
Vol 63 (3) ◽  
pp. 753-757 ◽  
Author(s):  
D. A. WALL ◽  
E. H. STOBBE
Keyword(s):  
Zea Mays ◽  
Soil Temperature ◽  
Zea Mays L ◽  
Differential Response ◽  
Zero Tillage ◽  
Tillage Practice ◽  
Plant Populations ◽  
Corn Hybrids ◽  
Delayed Emergence ◽  
Soil Temperatures

Studies were undertaken in 1980 and 1981 to determine whether selected corn hybrids varied in suitability for zero tillage cropping in Manitoba. Zero tillage resulted in reduced maximum soil temperatures at all depths examined. Delayed emergence, silking and maturity, and reduced plant dry weights and final plant populations were observed under zero tillage. The hybrids exhibited a differential response to tillage practice in the weight of grain produced per ear.Key words: Corn hybrids, zero tillage, soil temperature

scholarly journals The Effect of Tillage Treatments on Soil Temperature at Planting and on Corn (Zea mays L.) Yield

2001 ◽  
pp. 40-44
Author(s):  
Miklós Pakurár ◽  
László Lakatos ◽  
János Nagy
Keyword(s):  
Zea Mays ◽  
Soil Temperature ◽  
Zea Mays L ◽  
Time Period ◽  
Soil Temperatures ◽  
Time Periods ◽  
Time Required ◽  
Corn Hybrid

The effect of soil temperature was evaluated on the yield of the Occitan corn hybrid at a depth of 5 cm. We examined this effect on the time required from planting to emergence for three average durations: five, ten and fifteen days, all calculated from the day of planting. Winter plowing (27 cm), spring plowing (23 cm), disc-till (12 cm) treatments and 120 kg N per hectare fertilizer were applied. As a result of our analysis, we determined the post planting optimum soil temperatures for various time periods. The average soil temperature for a time period of 15 days post planting is the most usable for determining actual yields, followed by ten days, with five days proved to be the least usable (winter plow R2 = 0.86, spring plow R2 = 0.87, disc-till R2 = 0.64).

EFFECT OF SOIL WATER AND TEMPERATURE ON CORN (Zea mays L.) ROOT GROWTH DURING EMERGENCE

1986 ◽  
Vol 66 (1) ◽  
pp. 51-58 ◽  
Author(s):  
H. W. CUTFORTH ◽  
C. F. SHAYKEWICH ◽  
C. M. CHO
Keyword(s):  
Root Growth ◽  
Soil Temperature ◽  
Water Content ◽  
Soil Water ◽  
Zea Mays L ◽  
Rate Sensitivity ◽  
Corn Hybrids ◽  
Soil Water Stress ◽  
Soil Temperatures ◽  
Water Contents

Root growth between germination and emergence for the corn hybrids Pioneer 3995, Northrup King 403 and Pride 1108 was studied. Soil temperatures of 15, 19, 25 and 30.5 °C and a range of soil water contents were used. Decreases in soil temperature and water content both decreased root growth rate. Sensitivity to water content decreased with decreasing soil temperature. All three hybrids responded to soil temperature in the same way. By contrast, Pioneer 3995 was less sensitive to soil water stress than was Northrup King 403, while Pride 1108 was the most sensitive. Key words: Soil water, soil temperature, root growth (early), corn

THE EFFECT OF TILLAGE ON SOIL TEMPERATURE AND CORN (Zea mays L.) GROWTH IN MANITOBA

1984 ◽  
Vol 64 (1) ◽  
pp. 59-67 ◽  
Author(s):  
D. A. WALL ◽  
E. H. STOBBE
Keyword(s):  
Soil Temperature ◽  
Crop Residues ◽  
Zea Mays L ◽  
Marked Effect ◽  
Zero Tillage ◽  
Previous Crop ◽  
Soil Temperatures ◽  
Lower Maximum ◽  
Strip Tillage ◽  
Tillage Operations

The degree of tillage, presence of previous crop residues and the timing of tillage operations had a marked effect on soil temperatures. Zero tillage and the retention of the previous crop residues tended to depress the maximum soil temperatures at the 5.0-cm depth. Removal of crop residues from zero tillage plots resulted in an increase in maximum soil temperatures. Fall tillage resulted in lower maximum and higher minimum soil temperatures than where tillage was performed in the spring. Soil temperatures in the row were warmer than those recorded in the inter-row area of both the zero tillage and rotovated strip tillage treatments.Key words: Tillage, crop residues, soil temperature, corn

Effects of Helminthosporium maydis race T toxin on protoplasts of resistant and susceptible corn (Zea mays)

1975 ◽  
Vol 53 (5) ◽  
pp. 427-431 ◽  
Author(s):  
L. E. Pelcher ◽  
K. N. Kao ◽  
O. L. Gamborg ◽  
O. C. Yoder ◽  
V. E. Gracen
Keyword(s):  
Zea Mays ◽  
Cytoplasmic Streaming ◽  
Zea Mays L ◽  
Differential Response ◽  
Plant Tissues ◽  
Volume Increase ◽  
Intermediate Response ◽  
Extensive Degradation ◽  
Corn Inbred ◽  
Leaf Protoplasts

Leaf protoplasts from resistant (N, C, and S cytoplasm) and susceptible (T cytoplasm) corn inbred W182B (Zea mays L.) exhibited a differential response after exposure to Helminthosporium maydis race T toxin. The volume of untreated protoplasts increased twofold during the first 24 h after isolation and by 48–72 h, most protoplasts exhibited an extensive network of cytoplasmic strands and the chloroplasts were distributed throughout the cytoplasm by cyclosis. However, susceptible protoplasts exposed to ≥2 μg toxin/ml failed to increase in volume and cytoplasmic streaming was rarely observed. By 72 h there was extensive degradation and collapse of susceptible protoplasts exposed to toxin. Resistant protoplasts exposed to up to 100 μg toxin/ml exhibited a twofold volume increase and were indistinguishable from untreated protoplasts. Susceptible protoplasts exposed to 0.1 μg toxin/ml also appeared unaffected, but at 1.0 μg toxin/ml an intermediate response was observed. The differential response to H. maydis race T toxin of protoplasts from resistant and susceptible corn correlates well with those effects observed in intact plant tissues and may serve to explain further the mode of action of the toxin on susceptible corn cells.

DESEMPENHO PRODUTIVO DO MILHO HÍBRIDO SIMPLES EM FUNÇÃO DE ESPAÇAMENTOS ENTRE FILEIRAS E POPULAÇÕES DE PLANTAS

2017 ◽  
Vol 16 (3) ◽  
pp. 426
Author(s):  
MAURICIO FUMAGALLI ◽  
IVAN VILELA ANDRADE FIORINI ◽  
ROGERIO ALESSANDRO FARIA MACHADO ◽  
HELCIO DUARTE PEREIRA ◽  
CASSIANO SPAZIANI PEREIRA ◽  
...  
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Northern Region ◽  
Space Distribution ◽  
Row Spacing ◽  
Conventional System ◽  
Thousand Grain Weight ◽  
Plant Populations ◽  
Mato Grosso ◽  
Hybrid Maize

 RESUMO - O objetivo desta pesquisa foi avaliar o desempenho produtivo do milho submetido a diferentes espaçamentos entre fileiras e populações de plantas, nas condições da segunda safra de 2010, em Ipiranga do Norte, na região norte de Mato Grosso. O experimento foi implantado no dia 26 de janeiro, com o híbrido simples Pioneer 30S31, em sistema convencional de preparo do solo após a colheita da soja precoce. O delineamento experimental utilizado foi em blocos casualizados em esquema de parcelas subdivididas com quatro repetições. Os tratamentos foram representados por três espaçamentos entre fileiras de 0,5; 0,7 e 0,9 m nas parcelas principais e quatro populações de 50.000, 60.000, 70.000 e 80.000 plantas ha-1 nas subparcelas. Todos os parâmetros avaliados foram influenciados pelas populações de plantas. Os espaçamentos entre fileiras influenciaram o número de fileiras de grãos, a massa de mil grãos e a produtividade de grãos do milho. Ocorreu interação significativa entre os fatores de estudo para todos os componentes de produção, exceto quanto ao comprimento de espigas. O aumento das populações até 80.000 plantas ha-1, associado à redução do espaçamento entre fileiras, resultou na combinação mais eficiente com maior produtividade de grãos. Com o aumento do espaçamento entre fileiras, a população ótima ficou abaixo de 70.000 plantas ha-1 nos espaçamentos de 0,7 e 0,9 m entre fileiras.Palavras-chave: Arranjo de plantas, densidade de plantas, distribuição espacial, Zea mays L. MAIZE PRODUCTIVY PERFORMANCE OF SIMPLE HYBRID IN FUNCTION OF THEROW SPACING AND PLANT POPULATIONS  ABSTRACT - The objective of this study was to evaluate the maize productivy performance under different row spacing and plant populations, in conditions of off-season, crop year 2010, in Ipiranga do Norte, in the northern region of the State of Mato Grosso, Brazil. The experiment was implanted on 26 January, with a simple hybrid maize Pioneer 30S31, in a conventional system, after soybean crop. The experimental design was randomized blocks in split plots with four replications. The treatments were three row spacing between rows of 0.5, 0.7 and 0.9 m in main plots and four populations of 50.000, 60.000, 70.000 and 80.000 plants ha-1 in subplots. Plant populations influenced all parameters. The spacing between rows influenced the number of rows of grain, the thousand-grain weight and yield grains. The interaction was significative between row spacing and plant populations for all parameters, except for ear length. The increase in populations to 80.000 plants ha-1, associated with a reduced spacing between rows, proved to be the most effective resulting in highest grains yield. With increasing spacing between rows, the optimum population was below 70.000 plants ha-1 in the row spacing’s of 0.7 and 0.9 m between lines. Keywords: Plant arrangement, plants density, space distribution, Zea mays L. 

Response of fodder maize to different levels of nitrogen undervarious planting methods

2016 ◽  
Author(s):  
Rupinder Kaur Jassal ◽  
Avtar Singh ◽  
J. S. Kang ◽  
Thakar Singh
Keyword(s):  
Zea Mays ◽  
Seed Yield ◽  
Zea Mays L ◽  
Conventional Tillage ◽  
Zero Tillage ◽  
Nitrogen Levels ◽  
Planting Methods ◽  
Stover Yield ◽  
Planting Method ◽  
Different Levels

The experiment was conducted to find out the planting method and nitrogen level for enhancing the seed yield of fodder maize (Zea mays L.). The treatment comprised of three planting methods as zero tillage (ZT), conventional tillage (CT) and bed planting (BP) and four nitrogen levels (0, 100, 125 and 150 kg N/ha). Successive increase of 25kg N/ ha has significantly increased the seed and stover yield of maize with which significantly higher values of plant height, stover yield and shelling percentage was obtained.

COMPARISON OF MORPHOLOGY AND POROSITY OF A SOIL UNDER CONVENTIONAL AND ZERO TILLAGE

1987 ◽  
Vol 67 (3) ◽  
pp. 445-456 ◽  
Author(s):  
M. J. SHIPITALO ◽  
R. PROTZ
Keyword(s):  
Zea Mays ◽  
Organic Carbon ◽  
Zea Mays L ◽  
Soil Surface ◽  
Zero Tillage ◽  
Soil Morphology ◽  
Soil Taxonomy ◽  
No Till ◽  
Oriented Parallel ◽  
Earthworm Activity

Effects of tillage on soil morphology and porosity were investigated in plots planted to corn (Zea mays L.) for seven consecutive years. Micromorphometric analyses indicated that Ap horizons of no-till plots had approximately half the macroporosity (pores ≥ 200 μm equivalent circular diameter) of those of conventionally tilled plots. Loss of macroporosity was characterized by a decrease in mean pore size and a tendency for pores to become elongated, less tortuous, and oriented parallel to the soil surface. Obvious zoological activity, which consisted mainly of burrowing earthworms, resulted in two to nine times more bioporosity in a no-till pedon than in a conventionally tilled pedon. Earthworm activity also contributed to the formation of 5-cm-thick B & A horizon and a more uniform distribution of organic carbon than in the conventionally tilled pedon. These differences in morphology are reflected in the classification under Soil Taxonomy but not under the Canadian System. We speculate that zoological activity may serve to counteract the reduction in macroporosity in the Ap of the no-till pedon. Key words: Bioporosity, earthworms, micromorphometric analysis, zoological activity

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