EFFECT OF PLANT DENSITY AND SOIL FERTILITY ON THE PERFORMANCE OF NONOIL SUNFLOWER

1986 ◽  
Vol 66 (3) ◽  
pp. 801-804
Author(s):  
G. H. GUBBELS ◽  
W. DEDIO
Keyword(s):  
Soil Fertility ◽  
Key Words ◽  
Helianthus Annuus ◽  
Plant Density ◽  
Helianthus Annuus L ◽  
Plant Densities

The nonoil sunflower (Helianthus annuus L.) cultivar Sundak was grown at four plant densities and two soil fertility levels for 3 yr in the Morden, Manitoba area. Fertilizer increased achene yield in 2 of the 3 yr and increased achene size in 1 of the 3 yr. Achene size and weight decreased with increase in plant density. Achene yield reached a maximum at approximately 30 000 plants ha−1.Key words: Nonoil sunflower, Helianthus annuus L., plant density, soil fertility

EFFECT OF PLANT DENSITY AND SOIL FERTILITY ON OILSEED SUNFLOWER GENOTYPES

1986 ◽  
Vol 66 (3) ◽  
pp. 521-527 ◽  
Author(s):  
G. H. GUBBELS ◽  
W. DEDIO
Keyword(s):  
Soil Fertility ◽  
Helianthus Annuus ◽  
Plant Height ◽  
Field Experiments ◽  
Plant Density ◽  
Helianthus Annuus L ◽  
Plant Densities ◽  
Oil Concentration ◽  
Growth Habits ◽  
Delayed Flowering

Field experiments were conducted in the 1979 to 1982 seasons to determine the response of sunflower (Helianthus annuus L.) genotypes with different growth habits to different plant densities at two levels of soil fertility in the Morden, Manitoba area. Treatments included hybrids and an open-pollinated cultivar, no fertilizer and 250 kg ha−1 of 27-14-0 and plant densities of 30 000, 45 000, 60 000 and 75 000 plants ha−1. Hybrids and open-pollinated cultivar responded similarly to the fertility and plant density levels. An increase in plant density did not affect yield, but slightly delayed flowering time, increased plant height, test weight and oil concentration and decreased achene weight. A plant density of about 45 000 plants ha−1 was required to ensure optimum yield.Key words: Sunflower, Helianthus annuus L., plant density, soil fertility

RESPONSE OF EARLY-MATURING SUNFLOWER HYBRIDS TO ROW SPACING AND PLANT DENSITY

1990 ◽  
Vol 70 (4) ◽  
pp. 1169-1171 ◽  
Author(s):  
G. H. GUBBELS ◽  
W. DEDIO
Keyword(s):  
Key Words ◽  
Helianthus Annuus ◽  
Plant Height ◽  
Oil Content ◽  
Plant Density ◽  
Growth Habit ◽  
Row Spacing ◽  
Normal Height ◽  
Early Maturing ◽  
Plant Densities

Two early-maturing sunflower hybrids, Sunwheat 101 and MRS 34, with shorter than normal height and a narrower growth habit were grown at 30- and 60-cm row spacings and three plant densities at each row spacing in the 1986 and 1987 seasons at Morden, Manitoba. There were no differences in achene yield or oil content between row spacings. Plant height and oil content of achenes increased with increase in plant density, while achene weight decreased. Achene yield of both hybrids increased as plant density increased from 55 000 to the 74 000 plants ha−1 density, then remained relatively constant to 148 000 plants ha−1.Key words: Oilseed sunflower, Helianthus annuus L., plant row spacing, plant density

EFFECT OF PLANT DENSITY AND ROW SPACING ON AGRONOMIC PERFORMANCE AND ECONOMIC RETURNS OF NONOILSEED SUNFLOWER IN SOUTHEASTERN SASKATCHEWAN

1985 ◽  
Vol 65 (3) ◽  
pp. 501-509 ◽  
Author(s):  
N. W. HOLT ◽  
R. P. ZENTNER
Keyword(s):  
Helianthus Annuus ◽  
Seed Size ◽  
Seed Yield ◽  
Plant Density ◽  
Row Spacing ◽  
Agronomic Performance ◽  
Economic Returns ◽  
Helianthus Annuus L ◽  
Large Seed ◽  
Plant Densities

Years, locations and planting density are significant factors that influence the agronomic performance of Sundak nonoilseed sunflower (Helianthus annuus L.) in southeastern Saskatchewan. As plant densities of sunflower were increased from 37 500 to 75 000 plants/ha at Indian Head from 1975 to 1977, achene (seed) yield and test weight increased linearly with density while percentages of roasting and dehulling seed categories decreased. Row spacings of 30–90 cm affected plant height and seed yield and size, but absolute amounts were not large. Based on 1984 prices of four seed-size categories, highest gross economic returns were favored by the higher plant densities. In a second test at Indian Head and Oxbow in 1979 and Areola in 1980, a range of plant densities from 22 900 to 76 400 plants/ha did not significantly affect seed yield or gross economic returns. However, yield and returns tended to be greatest for 50 000-60 000 plants/ha. Percentages of large seed decreased as plant population increased. Because markets generally favor the large-seed size categories and the price differentials among seed size categories tend to increase, plant densities of 40 000 to 50 000 plants/ha might better be recommended to allow for years with greater price differentials.Key words: Nonoilseed sunflower, Helianthus annuus L., plant density, row spacing, seed size, economic returns

EFFECT OF PLANT DENSITY AND SEEDING DATE ON EARLY- AND LATE-MATURING SUNFLOWER HYBRIDS

1989 ◽  
Vol 69 (4) ◽  
pp. 1251-1254 ◽  
Author(s):  
G. H. GUBBELS ◽  
W. DEDIO
Keyword(s):  
Helianthus Annuus ◽  
Plant Height ◽  
Oil Content ◽  
Field Experiments ◽  
Plant Density ◽  
Helianthus Annuus L ◽  
Seeding Date ◽  
Plant Densities

Field experiments were conducted in 1983, 1984 and 1986 to determine the response of Sun M 20 (early) and 894 (late) sunflower (Helianthus annuus L.) hybrids to three plant densities (30 000, 45 000 and 60 000 plants ha−1) at two seeding dates (18–24 May and 13–16 June). With increase in plant density, achene yields followed the same trends in each seeding date for both hybrids. Yields were similar at the 30 000 and 45 000 plant densities, but lower at the 60 000 density. Plant height and oil content of achenes increased while achene weight decreased with increase in plant density. Plant height was greater but achene weight, oil content and achene yield were lower in the late than the early seeding.Key words: Sunflower, Helianthus annuus L., plant density, seeding date

EFFECT OF PLANT DENSITY ON THE AGRONOMIC PERFORMANCE OF SUNFLOWER ON DRYLAND

1984 ◽  
Vol 64 (3) ◽  
pp. 599-605 ◽  
Author(s):  
N. W. HOLT ◽  
S. J. CAMPBELL
Keyword(s):  
Helianthus Annuus ◽  
Seed Weight ◽  
Oil Content ◽  
Seed Oil ◽  
Plant Density ◽  
Agronomic Traits ◽  
Agronomic Performance ◽  
Head Diameter ◽  
Helianthus Annuus L ◽  
Days To Maturity

This study investigated the influence of plant density on several agronomic traits of four sunflower (Helianthus annuus L.) cultivars grown at Indian Head and Saskatoon, Saskatchewan in the semiarid prairies. At populations of 40 000–85 000 plants∙ha−1, plant density had no significant effect on seed yield. The increase in percentage oil content with increase in plant density (44.3–45.6%) was small but significant. As plant density was increased, days to flower, height and test weight increased while days to maturity, head diameter and average seed weight decreased. Cultivars × density interactions were generally not significant. Environment (five location-years) had a significant effect on all variables, and environments × cultivar interactions were significant for most of these. Results of this experiment indicated that testing of sunflower lines at several locations in the growing area would be necessary for best assessment but one plant density, suitable to that area, could be used.Key words: Sunflower, plant density, seed, oil, seed size, Helianthus annuus L.

Identification of bacteria isolated from roots of sunflower (Helianthus annuus) cultivated in a French soil

1991 ◽  
Vol 37 (12) ◽  
pp. 971-974 ◽  
Author(s):  
Jacques Fages ◽  
Benoit Lux
Keyword(s):  
Key Words ◽  
Helianthus Annuus ◽  
Azospirillum Lipoferum ◽  
Agrobacterium Radiobacter ◽  
Gram Negative ◽  
Helianthus Annuus L ◽  
Nitrogen Fixers ◽  
Identification Of Bacteria

The bacterial microflora of the rhizoplane and roots of sunflower (Helianthus annuus L.) grown in a French soil was examined. Gram-negative, oxidative isolates were dominant, among which Agrobacterium radiobacter and Pseudomonas vesicularis were the most common. Only 4 of the 45 isolates were nitrogen fixers (acetylene reducers), and they all belonged to the Azospirillum lipoferum species. Key words: sunflower, rhizoplane, Gram-negative isolates.

scholarly journals CRESCIMENTO E TEORES RELATIVOS DE CLOROFILA EM PLANTAS DE GIRASSOL SUPLEMENTADAS COM ALGAS MISTAS, Hypnea pseudomusciformis OU Ulva fasciata

Nativa ◽  
2020 ◽  
Vol 8 (4) ◽  
pp. 533-537
Author(s):  
Paulo Ovídio Batista de Brito ◽  
Gabriela De Sousa Ferreira ◽  
Francisco Ícaro Carvalho Aderaldo ◽  
Joana D'arck Farias Braga ◽  
Janacinta Nogueira De Souza ◽  
...  
Keyword(s):  
Plant Growth ◽  
Key Words ◽  
Helianthus Annuus ◽  
Production Costs ◽  
Viable Alternative ◽  
Sunflower Seeds ◽  
Organic Fertilization ◽  
Ulva Fasciata ◽  
Helianthus Annuus L ◽  
Volume Em

O trabalho objetivou analisar os efeitos da utilização das algas Hypnea pseudomusciformis, Ulva fasciata, e de algas mistas coletadas na Praia do Pacheco, Caucaia-CE sobre o crescimento de girassol (Helianthus annuus L.) avaliando-se: variáveis de crescimento e teores relativos de clorofila. O trabalho foi conduzido em casa de vegetação. As sementes de girassol foram semeadas em baldes de plástico com capacidade para cinco litros. O experimento foi dividido em oito tratamentos: areia (100% do volume em areia); areia + 100% da recomendação de nitrogênio (RN) em húmus; 100% da RN em algas mistas, 50% da RN em algas mistas; 100% da RN em Hypnea pseudomusciformis, 50% da RN em Hypnea pseudomusciformis, 100% da RN em Ulva fasciata e 50% da RN em Ulva fasciata. A utilização de algas arribadas ocasionou melhoria nas variáveis de crescimento analisadas em relação às plantas crescendo em substrato com areia ou areia + húmus. Os melhores resultados foram observados a 50% da RN em algas mistas. Dessa forma, a utilização de algas arribadas como fertilizantes apresentou-se como uma alternativa viável, gerando diminuição dos custos de produção. Palavras chave: Helianthus annuus L.; fertilização orgânica; macroalgas.   GROWTH AND RELATIVE CHLOROPHYLL LEVELS IN SUNFLOWER PLANTS SUPPLEMENTED WITH MIXED ALGAE - Hypnea pseudomusciformis OR Ulva fasciata   ABSTRACT: The work’s aim was to analyze the effects of the use of Hypnea pseudomusciformis, Ulva fasciata, and mixed algae, collected at Pacheco Beach, Caucaia-CE on sunflower (Helianthus annuus L.) plants evaluating: growth variables and relative chlorophyll levels. The work was conducted under greenhouse conditions. Sunflower seeds were sown in five-liter plastic buckets. The experiment was divided in eight treatments: sand (100% of the volume in sand); sand + 100% of nitrogen  recommendation (NR) in humus; 100% of NR in mixed algae, 50% of NR in mixed algae; 100% of NR in Hypnea pseudomusciformis, 50% of NR in Hypnea pseudomusciformis, 100% of NR in Ulva fasciata and 50% of NR in Ulva fasciata. The use of "arribadas algae" caused improvement in plant growth variables analyzed in comparison to plants growing on sand or sand + humus substrate. The best results were observed at 50% of NR in mixed algae. Thus, the use of "arribadas algae" as fertilizers presented itself as a viable alternative, generating reduction of production costs. Key words: Helianthus annuus L.; organic fertilization; macroalgae.

Heterosis and prediction of achene oil content in sunflower hybrids from parental lines

1993 ◽  
Vol 73 (3) ◽  
pp. 737-742 ◽  
Author(s):  
Walter Dedio
Keyword(s):  
Key Words ◽  
Helianthus Annuus ◽  
Multiple Regression ◽  
Oil Content ◽  
Regression Equations ◽  
Helianthus Annuus L ◽  
Kernel Oil ◽  
Oil Components ◽  
Parental Lines ◽  
Kernel Content

Oil content of the sunflower achene is determined by its components, namely kernel content and kernel oil content. The object of this study was to determine the heterosis and relative contributions of the parents to the achene oil, kernel oil and kernel content of the hybrid. Multiple regression equations showed that the two parents contribute equally to the achene oil content of the hybrids. Heterosis was observed in the kernel oil content and kernel content as well as the achene oil content. A heterotic effect of 47 g kg−1 over the mid-parent value was observed for achene oil content. For the achene oil components, heterotic effect of 44 g kg−1 was obtained for kernel oil content and 24 g kg−1 higher for kernel content. Key words: Sunflower, achene oil content, kernel oil content, kernel content, Helianthus annuus L., heterosis

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