scholarly journals Response of irrigated sunflower (Helianthus annuus L.) hybrids to nitrogen fertilization: growth, yield and yield components

2011 ◽  
Vol 50 (No. 5) ◽  
pp. 205-211 ◽  
Author(s):  
H. Özer ◽  
T. Polat ◽  
E. Öztürk
Keyword(s):  
Helianthus Annuus ◽  
Nitrogen Fertilization ◽  
Yield Components ◽  
Growth Yield ◽  
N Fertilization ◽  
Yield Response ◽  
Sufficient Information ◽  
Helianthus Annuus L ◽  
Application Rates ◽  
Yield And Yield Components

N fertilization has a substantial influence on sunflower (Helianthus annuus L.) seed yield and quality. It was also well established that high-yielding sunflower hybrids had more N requirement than old cultivars such as open-pollinated ones. However, in Turkey, no sufficient information regarding the response of new developed oilseed sunflower hybrids to nitrogen fertilization under irrigated conditions. Therefore, a 2-year study was conducted to determine the effects of nitrogen application rates on the growth, yield, and yield components of two oilseed sunflower hybrids (AS-508 and Super 25) under irrigated conditions. In this study, all plant parameters were significantly influenced by applied nitrogen fertilizer rates. Yield response to nitrogen rates was positive and linear. Our research data indicated that under irrigated conditions N rate of 120 kg/ha was adequate for sunflower production in this region.

EFFECT OF ROW DIRECTIONS ON YIELD AND YIELD COMPONENTS OF SUNFLOWER (Helianthus annuus L.) / EFECTO DE LA DIRECCION DE EXTENSION DE HILERA SOBRE EL RENDIMIENTO Y LOS COMPONENTES DEL RENDIMIENTO DE GIRASOL (Helianthus annuus L.) / EFFET DU SENS DES RANGÉES SUR LE RENDEMENT ET LES COMPOSANTES DU RENDEMENT CHEZ LE TOURNESOL (Helianthus annuus L.)

Helia ◽  
2001 ◽  
Vol 24 (34) ◽  
pp. 137-144
Author(s):  
S. Asad Shafiullah ◽  
M.A. Rana Baitullah ◽  
A.S. Khan Baitullah
Keyword(s):  
Moisture Content ◽  
Helianthus Annuus ◽  
Seed Yield ◽  
Yield Components ◽  
Agricultural Research ◽  
Seed Moisture Content ◽  
Helianthus Annuus L ◽  
Seed Moisture ◽  
Yield And Yield Components ◽  
East West

SUMMARY Effect of different row directions on yield and yield components of sunflower (Helianthus annuus L.) was studied in a field experiment at National Agricultural Research Center, Islamabad, Pakistan, during spring 1991 and 1992. Four row directions, i.e., north-south (NS), east-west (EW), north eastsouth west (NESW) and north west-south east (NWSE) had very little effect on seed yield and other agronomic characters of sunflower. The differences in the mean plant height, head diameter, seed yield, 100-achene weight and fatty acid profile were statistically non-significant. Trends were similar in both years. As an average of the two years, although statistically non-significant, the highest seed yield of 3065 kg/ha was obtained from north east-south west (NESW) row direction and the lowest yield of 2624 kg/ha from east-west (EW) row direction. The most pronounced effect of row direction was noted on seed moisture content. As an average of the two years, the maximum seed moisture content at harvest (21.4%) was obtained from east-west (EW) row direction and the minimum (14.6%) from north-south (NS) row direction. NESW row direction also gave significantly lower moisture content (15.1%) than EW (21.4%) and NWSE (18.1%) row directions. Therefore, using north-south and NESW row directions would help the crop to dry more quickly before harvest and reduce post harvest costs and losses. Seed production fields that require examination of sunflower heads to detect pollen production should be planted in NS rows for efficient roguing to maintain genetic purity. For research plots, EW rows with plot labels on the east end are often preferred, because it is easier to evaluate most plots when all heads face the viewer.

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