Yield Components Of Sunflower Research Articles

Effects of Nitrogen and Rapeseed Residues on Grain Yield and Yield Components of Sunflower (Helianthus annuus L.) and Weed Growth

ABSTRACT- Crop residue is applied to amend soil properties and increase crop yield. In this study, the effects of rapeseed residues and different rates of nitrogen on grain yield and yield components of sunflower and weed dry matter were investigated. The experiment was conducted at the Experimental Farm of College of Agriculture, Shiraz University, located at Badjgah, Shiraz, Iran in 2007-2008 and 2008-2009 growing seasons. Treatments were nitrogen levels (150, 300 and 450 kg urea ha-1) as main plot and rates of residue rapeseed (25%, 50%, 75%) and without residues included weed free (R0) and weedy check (R1) as sub plot. The experimental design was a split plot based on randomized complete block in four replications. Results showed that the lowest weed biomass, highest grain yield and yield components of sunflower were obtained at 150 and 450 kg N ha-1, respectively. Compared to weedy conditions, the lowest weed biomass (2847.58 kg ha-1) and the highest yield (4087.67 kg ha-1) of sunflower were obtained at 75 and 25 % residue, respectively. Optimum rates of nitrogen fertilizer and rapeseed residue to guarantee maximum grain yield and optimum suppression of weeds were 450 kg ha-1and 25%, respectively. Generally, to increase sunflower yield and suppress weeds, it is recommended to integrate cultural practices with use of 450 kg urea ha-1 fertilizers and left over 25% of rapeseed residue, was the best treatment.

Influence of Foliar Applied Nitrogen on Reproductive Growth of Sunflower (<i>Helianthus annuus</i> L.) under Water Stress

Nitrogen is a major nutrient involved in plant growth and yield. Plants cannot get the nutrients from the soil medium under water stress condition to testify foliar application in stress condition to fulfil plant need for better performance. In this regard, a field study was conducted to evaluate the effect of foliar-applied nitrogen (0, water and 1% urea) on sunflower (cv. Hysun-33) under normal and water stress at reproductive stage. Two soil applied nitrogen levels control (0 kg·ha-1) and recommended dose (115 kg·ha-1). Supplemental foliar application of nitrogen in the form of urea significantly increased the growth, yield and yield components of sunflower under water stress. The increase in yield with 1% urea spray was recorded up to 1.37 t·ha-1 in comparison to water spray (1.07 t·ha-1) and no spray (1.00 t·ha-1). While maximum values of all factors were obtained where 1% urea spray with soil applied nitrogen was used in both stresses as well as in non-stress condition. Therefore, reasonable yield can be achieved by applying foliar application of urea (1%) as a supplemental source to soil applied nitrogen under water stress.

Can methanol foliar application improve the productive performance of sunflower under water deficit stress

In order to investigate the effect of water deficit stress and methanol foliar application on yield and yield components of sunflower (Helianthus annuus L), an experiment was conducted in the split plot form based on Completely Randomized Block Design with three replications during growing seasons of 2011-2012. Treatments were water deficit stress in four levels: a1: severe stress (25% FC irrigation), a2: mild stress (50% FC irrigation), a3: fair stress (75% FC irrigation) and a4: normal irrigation (100% FC irrigation) and the foliar application of methanol in six levels [b1:0, b2:7, b3:14, b4:21, b5:28 and b6:35 (v/v)]. The analysis of variance showed significant effect of interaction between water deficit stress and methanol foliar application on plant height, stem and head diameter, empty and full seed number (p<0.01). The results showed that foliar application with 21% (v/v) methanol and normal irrigation produced 35% more plant height, 65% more head diameter. Besides, the results also proved that 14% (v/v) methanol foliar application in normal irrigation had the highest stem diameter (34 cm).furthermore, the lowest empty seed number (248) and the highest full seed number (1611) were observed for 7% (v/v) methanol and normal irrigation.

Effect of Planting Dates and Plant Spacing on Growth, Yield and Yield Components of Sunflower (Helianthus annuus L.) in Iraqi Kurdistan Region

A field study was conducted in spring of 2011, at Kanipanka and Bakrajo, in the province of Sulaimani to evaluate the impact of planting dates and spacing on growth and yield of oilseed sunflower (Helianthus annuus L.), variety "Flame". The experiment comprised of three planting dates (March15th, 30th and April15th), and three-plant spacing (15, 20, and 25 cm). Seed yields obtained from earlier planting date and narrow plant spacing were significantly higher. The results also showed that the early planting date March15th has a significant positive effect on plant height, stem diameter, head size, and seed weight than the late planting date April15th as an average of both locations. The interaction between planting dates and plant spacing as an average of both locations, showed that March15th planting date and 25 cm plant spacing had significantly higher 1000 seed weight and seed weight per plant, while the highest seed yield gained by the interaction of March 15th and plant spacing 15cm. Percentage seed oil content collected as an average of both locations was significantly higher from plants with late planting date April 15th at 20 cm plant spacing. All the studied characters except seed oil percentage shows higher significant values at Kanipanka location due to the favorable agro- climatic condition compared to Bakrajo location.

Impact of Nitrogen and Plant Growth Promoting Rhizobacteria on yield and yield components of sunflower in a glasshouse environment

The effects of Nitrogen (N) and Plant Growth Promoting Rhizobacteria (PGPR) on growth and development of sunflower (Helianthus annuus L. var. Hysun-33) grown in the greenhouse under a natural environment were studied. The N-use efficiency of a sunflower crop grown under three N rates (N1 = 0 kg ha−1, N2 = 120 kg ha−1, and N3 = 240 kg ha−1) and three PGPR levels (R1 = 0 kg ha−1, R2 = 30 kg ha−1, and R3 = 60 kg ha−1) were investigated. The maximum amount of N resulted in higher total dry matter production per plant and the effect was prominent from 34 days after sowing (DAS). Seed yields differed significantly among different sunflower crops especially at limiting N supply, with significant shifts according to the N level. N uptake was an important parameter for yield at all N rates. The 240 kg N ha−1 treatments provided the maximum yield, while the oil contents in these treatments of higher yield showed a lower oil content (%). Harvest index was also significantly correlated to yield across N rates; however, its importance depended much on environmental conditions as well. It can be inferred from the study that sunflower crop is well-supplied with respect to growth, development, yield and yield components, to enhance N efficiency and depends very much on the N supply. All the parameters gave maximum results with the increment of N while PGPR regimes had no prominent impact on the sunflower crop, the target environment, and the target yield level grown under a specified controlled glasshouse environment.

Analysing and modeling the relationship between yield and yield components in sunflower under different planting dates

The relationships between planting dates and yield and it's components in sunflower was evaluated through orthogonal polynomial regression analysis. Five field experiments were conducted during the summer season of 2011 to study the effect of five planting dates and three oilseed sunflower genotypes and their interactions on yield and yield components of sunflower. The highest seed yield, oil yield, plant height, head diameter, 1000-seed weight, seed yield plant-1 and oil content were obtained at the earliest planting date (1st May). The evaluated genotypes differed significantly for all the studied traits. Sakha 53 cultivar was the best cultivar in seed yield, oil yield, plant height, head diameter, thousand seed weight and seed yield plant plant-1 followed by Giza 102 and Pioneer hybrid 63M02, respectively. Orthogonal polynomial regression analysis revealed that, yield and yield components were significantly affected by planting date in linear responses. Multiple linear regression analysis indicated that seed yield plant-1, head diameter and thousand seed weight were the most important variables contributing toward higher seed yield (kg ha-1). Finally, it can be concluded that planting sunflower cultivar Sakha 53 on 1st May was recommended for maximizing seed and oil yields per unit area under the environmental conditions of this study. Key words: Sunflower, planting date, genotype, regression analysis, yield, yield components.

Yield and yield components of imidazolinone-resistant sunflower (Helianthus annuus L.) are influenced by pre-emergence herbicide and time of post-emergence weed removal

With an increase in the use of imidazolinone (IMI)-resistant sunflower, it is important to determine the influence of weed interference and herbicide presence on seed yield and yield components of sunflower. The objective of this study was to determine the effect of different periods of weed presence on seed yield and yield components of IMI-resistant sunflower grown with and without pre-emergence (PRE) herbicide. Field studies were conducted in 2008 and 2009 at three locations in Serbia and one location in Nebraska, USA. A four-parameter log-logistic model described relationship between the crop yield and yield components to increasing duration of weed presence. Sunflower yield and yield components varied between years and among locations. Increasing periods of weed interference decreased yield and yield components of sunflower; however, the reductions were greater without PRE herbicide compared to the PRE herbicide treated plots. The length of time weeds could remain in the crop grown without PRE herbicide ranged from 14 to 26 days after emergence (DAE), which corresponded to the V3 (three leaves) to V4 growth stages on the basis of the 5% acceptable yield loss level. The duration of time that weeds could remain in the crop grown with PRE herbicide ranged from 25 to 37 DAE, which corresponded to the V6–V8 growth stages of sunflower. Practical implication of this study is that post-emergence weed control in IMI-resistant sunflower grown with PRE herbicide can be delayed approximately by two weeks compared to the crop grown without PRE herbicide.

Response of Sunflower to Nitrogen Application and Water in Northern Brazil Alfisol

Decline in crop yield has been a problem in Northern Brazil region due to inherent low fertility status of the soils and water deficit of different crops. In order to study the effects of nitrogen and available soil water levels on growth and yield components of sunflower, an experiment was carried out from March to June 2010 in a semi-controlled greenhouse condition of the Federal University of Campina Grande, Paraiba, Brazil using Alfisol soil. The treatments were arranged as a completely randomized design, in a 4×4 factorial experiment (four nitrogen levels and four available soil water levels), in triplicates, total of 48 experimental units. The nitrogen levels in kg/ha were 0; 60; 80 and 100 which was added as urea; the available soil water levels were 55; 70; 85 and 100%. The results of this research indicate that nitrogen had a significant effect only on leaf area at 40 DAS and % achenes viable. The effect of available soil water on sunflower cv. Embrapa 122/V-2000 biometry and the yield showed that there were significant differences, on average, in all growth traits (stem height and diameter) at 40 and 60 DAS, in leaf number at 40 DAS, in leaf area at 40 and 60 DAS and in all production traits. The biometry and yield response to available soil water of different crops is of major importance in production planning. In this study, the maximum biometry and yield response factor of sunflower was determined at 100 % of available soil water.

ВЛИЯНИЕ НА РЕГУЛИРАНИЯ ВОДЕН ДЕФИЦИТ ВЪРХУ СТРУКТУРНИТЕ ЕЛЕМЕНТИ НА ДОБИВА ПРИ СЛЪНЧОГЛЕДА І. ОТМЯНА НА ПОЛИВКИ ПО ФАЗИ

ВЛИЯНИЕ НА РЕГУЛИРАНИЯ ВОДЕН ДЕФИЦИТ ВЪРХУ СТРУКТУРНИТЕ ЕЛЕМЕНТИ НА ДОБИВА ПРИ СЛЪНЧОГЛЕДА І. ОТМЯНА НА ПОЛИВКИ ПО ФАЗИ

ВЛИЯНИЕ НА РЕГУЛИРАНИЯ ВОДЕН ДЕФИЦИТ ВЪРХУ СТРУКТУРНИТЕ ЕЛЕМЕНТИ НА ДОБИВА ПРИ СЛЪНЧОГЛЕДА IІ. ЕДНОКРАТНА ПОЛИВКА ПРЕЗ ЕДНА ОТ ФЕНОФАЗИТЕ

ВЛИЯНИЕ НА РЕГУЛИРАНИЯ ВОДЕН ДЕФИЦИТ ВЪРХУ СТРУКТУРНИТЕ ЕЛЕМЕНТИ НА ДОБИВА ПРИ СЛЪНЧОГЛЕДА IІ. ЕДНОКРАТНА ПОЛИВКА ПРЕЗ ЕДНА ОТ ФЕНОФАЗИТЕ

English

Sunflower (Helianthus annus&nbsp;L.) having high degree of adaptability under wide range of climatic conditions, allow the crop to be productive in broad range of environments. Field experiments in autumn were laid out at Pir Mehr Ali Shah, Arid Agriculture University Rawalpindi, Pakistan for two years (2007 and 2008), to document the effect of growing degree days (GDD) on the performance of sunflower hybrids. Four sunflower hybrids, Alisson-RM, Parasio-24, MG-2 and S-278 were planted in randomized complete block design with four replications during autumn season. The data on growing degree days accumulation during autumn and their effect on achene, oil&nbsp; yield and yield components of sunflower like number of achenes per head, hundred achenes weight, biological and achene yield was recorded. All these agronomic characters as well as oil characteristics were influenced by prevailing temperature. GDD collected during autumn season was&nbsp;thesame for both years of study. Amongst hybrids, the hybrid MG-2 showed the maximum values for all the agronomic as well as oil parameters during the autumn season. At&nbsp;the late planting of sunflower during autumn season, crop completes its life cycle in short duration and accumulates less heat units, thus, achene and oil yield along with yield attributes are affected accordingly. &nbsp; Key words:&nbsp;&nbsp;Growing degree days (GDD), yield and yield components, sunflower.

Effects of foliar micronutrient application on osmotic adjustments, grain yield and yield components in sunflower (Alstar cultivar) under water stress at three stages

In order to study the effects of foliar micronutrient application under water stress, at three stages of growth, on prolinee and carbohydrate concentration, grain yield and yield components of sunflower (Alstar cultivar), a field experimental in split plot design with three replications was conducted in 2007. Alstar cultivar was comprised under water stress at three stages of growth (heading, flowering and grain filling) as main plot and seven micronutrient treatments, Fe, Zn, Mn, Fe+Zn, Fe+Mn, Zn+Mn and Fe+Zn+Mn, as sub-plots. Results showed that water stress at three stages of growth significantly decreased grain yield, biological yield, 1000 weight seeds, cap diameter and cap weight of sunflower (Alstar cultivar). The impact of water stress was more pronounced when applied at grain filling. Use of foliar micronutrient increased grain yield in water stress on the other hand, use of Mn foliar application had the highest positive effect on yield components and grain yield. Free prolinee and total soluble carbohydrate concentration were increased under water stress, at all of the three stages of growth. The highest concentration of these two components was found on the flowering stage. Key words: Water stress, micronutrient, grain yield, osmotic adjustment, sunflower.

Line X tester analysis for yield components in sunflower and their correlations with seed yield (Helianthus annuus L.)

The creation of new sunflower hybrids with high genetic potential for seed yield on the basis of interspecies hybridization requires a possession of the information about the mode of inheritance and the combining abilities of the created inbreed lines for the total seed number per head and the mass of 100 seeds. Apart from this the research of interdependence between yield components and seed yield allows the defining of traits which have the biggest influence on the yield formation. Significant differences were found among the A lines, Rf testers and their F1 hybrids in total seed number per head and the mass of 100 seeds. Analysis of variance of the combining abilities revealed highly significant differences for GCA and SCA. Highly significant positive value GCA was demonstrated by A-line NS-GS-5 for both traits. Hybrid NS-GS-5xRHA-R- PL-2/1 has the highest significant value SCA for both traits. The main role in inheritance of the total seed number per head and the mass of 100 seeds is played by non additive component of the genetic variance which is confirmed by the GCA/SCA relation in F1 generation that is less than one (0.11, 0.24). Rf-testers had the highest average contribution in the expression of the total seed number per head (55.8%) while for the mass of 100 seeds a more significant contribution was given by A-line (70.6%). A strong positive interdependence has been determined between seed yield and total seed number per head (0.376

Production of Sunflower and Biomass Depending on Available Soil Water and Nitrogen Levels

In order to study the effects of nitrogen and available soil water levels on growth and yield components of sunflower (cv. Embrapa 122 / V-2000), an experiment was carried out from November 2009 to October 2010 in the Agricultural Engineering Department of the Federal University of Campina Grande, Campina Grande, Paraiba, Brazil. The treatments were arranged as a completely randomized design, in a 4×4 factorial experiment (four nitrogen levels and four available soil water levels), with three replications, totaling 48 experimental units. The nitrogen (N) levels in kg ha were: 0; 60; 80 and 100 added as urea; the available soil 1 water (AW) levels were 55; 70; 85 and 100%. In conclusion, this study showed that the application of nitrogen fertilizer levels and available soil water levels led to significant increase in growth and production traits except for the dry weight of 1000 seeds.

Combining Ability and Heterosis for Yield and Yield Components in Sunflower

Field experiments were carried out during 2005-2007 in order to study the genetic structure of a hybrid sunflower population, to identify the parents and crosses showing superior general and specific combining ability and finally to evaluate F1 hybrid vigour. Six artificial hybrids were created using 3 CMS and 2 restorer lines in sunflower (Helianthus annus L.) According to the results, the ratios of GCA:SCA variance were lower than 1 for plant height and head diameter in the both years; for number of seeds per head and 1000 seed weight in 2007 and for seed yield in 2006. For all these characters, non-additive effects were more effective than the other types of polygenetic effects. The additive gene actions were significant for 1000 seed weight and number of seeds per head in 2006 and for plant height and seed yield in 2007, since the ratios of GCA:SCA variances for these characters were greater than 1. The parental lines CMS 10 and RHA 10 proved to be good combiners having the highest positive GCA effect in yield and certain yield components. The crosses CMS 10 x RHA 03, CMS 01 x RHA 10, CMS 10 x RHA 10 and CMS 23 x RHA 10 might be considered as promising hybrid combinations in terms of seed yield . The values of heterosis and heterobeltiosis values ranged from 109.8 to 218.3% for seed yield. All of the tested hybrids showed positive and significant heterobeltiosis for seed yield.

Interactive Effects of Potassium and Phosphorus on Phenology and Grain Yield of Sunflower in Northwest Pakistan

Potassium (K) and phosphorus (P) applications improve growth, increase yield and yield components of sunflower ( Helianthus annuus L.) on K and P deficient soils in Northwest Pakistan. A field experiment was conducted using sunflower cv. Hysun-33 at the New Developmental Research Farm of KPK Agricultural University, Peshawar, Pakistan, during summer 2006. The experimental design was a randomized complete block in split plot arrangements, with six levels of K (0, 25, 50, 75, 100, and 125 kg K ha −1) as main plots and four levels of P (0, 45, 90, and 135 kg P ha −1) as sub-plots with three replications. Sunflower yield and yield components responded positively to K and P fertilization but the magnitude of response varied with the levels of K and P. Days to flowering and maturity, grains per head, 1000-grain weight, shelling percentage, and grain yield increased tremendously in the K and P-fertilized plots as compared to the control with no K and P applied. The combined application of 100 kg K and 45 kg P ha −1 significantly increased yield components, grain yield, harvest index, and shelling percentage of sunflower, suggesting that 100 kg K ha −1 in combination with 45 kg P ha −1 could maximize productivity of sunflower planted after wheat on the K and P deficient soils in the study area.

Investigation of yield and yield components of sunflower (Helianthus annuus L.) cultivars in the ecological conditions of Berlin (Germany)

SUMMARY Sunflower is an important oilseed crop because of its wide adaptability, suitability to mechanization, low labor needs and high protein and oil contents. The present study aimed to investigate the relationship between growing degree days and yield and yield components in different sunflower hybrids and to identify environmental factors and crop characteristics that affect grain yield in sunflower without irrigation in Berlin environmental conditions. The study was conducted in the experiment fields at the Crop Science Department of the Agriculture and Horticulture Faculty of Humboldt University during 2010. The experiment was laid out in a randomized block design, with four blocks of plots of eight Turkish cultivars (Sanbro, Tarsan, DKF-2525, TR-3080, EDR- 08-01, EDR-08-02, EDR-08-03, EDR-08-04) and two German cultivars (Pegasol, NK Delfi). It was determined that the differences among all the sunflower cultivars were statistically significant for plant height, stem diameter, head diameter, 1000 seed weight, dry matter, harvest index, seed yield per plant, seed yield, leaf number, GDD (Growing Degree Daysand sun radiation. The highest mean stem diameter, harvest index and 1000 seed weight were obtained from Pegasol. NK-Delfi had the highest mean head diameter and consequently the highest seed yield (3,876.6 kg ha-1), followed by DKF-2525 and Sanbro (3,498.7 and 3412.9 kg ha-1, respectively). The sunflower cultivars required between 127 and 137 days, 2,263.57°C GDD and 927.54 h sunshine radiation from planting to maturity, as the mean of all the cultivars. Generally, the seed yields of the Turkish candidate genotypes were lower than those of the other sunflower cultivars. The seed yield of these genotypes can be improved with another agriculture method. The rainfall and cold weather in May slowed the growth of sunflower and also the rainfall and cold weather in August delayed maturity. The dry and hot weather in June and July created stress on plants. In terms of seed yield, NK-Delfi, DKF-2525, Sanbro, and Pegasol proved to be suitable sunflower cultivars to be grown in Berlin.

EFFECT OF INTERCROPPING SUNFLOWER WITH PEANUT UNDER DIFFERENT RATES OF NITROGEN FERTILIZATION ON YIELD COMPONENTS OF BOTH CROPS.

Two field experiments were carried out at Agricultural Research Stations in Ismailia Governorate during 2005 and 2006 seasons to study the effect of six intercropping patterns ,sunflower was planted on other side of the second ridge of peanut at 20, 40 and 60 cm apart between hills and thinned on one , two , and three plants / hill respectively to give 50 % of its pure stand , and on the third ridge of peanut at 20 , 40 and 60 cm a part between hills respectively and thinned on one , two and three plants / hill to give 33 % of its pure stand and three nitrogen fertilizer levels (40 ,50 , and 60 kg N / fed ) on growth , yield and yield components and seed oil % of peanut and sunflower . A split – plot design was used with three replications. The main obvious results of this study can be summarized as follows. Peanut: The results revealed that plant height, number and weight of pods /plant and pods yield / fed of peanut were significantly affected by different intercropping patterns in both seasons, whereas number of branches / plant ,shilling % and seed oil % were not significantly affected in both seasons; and weight of 100 seeds were significantly affected in the second season only. Intercropping patterns 100 % peanut +33 % sunflower gave the highest value for yield of peanut in both seasons. All studied characters of peanut were significantly affected by increasing N fertilizer levels from 40 to 50 up to 60 kg N / fed in both seasons, except numbers of branches/ plant were not significantly affected in the first season. Interaction between intercropping patterns and N fertilizer levels significantly affected on number of pods / plant and weight of seeds / plant in both seasons, weight of pods / plant and pods yield/ fed in the second season. Sunflower: All studied characters of sunflower were significantly affected by intercropping patterns in both seasons, except numbers of leaves / plant and seed oil% were not significantly in both seasons, whereas stem diameter was significantly affected in the first season only. Intercropping pattern 100 % peanut + 50 % sunflower gave the highest value for yield of sunflower in both seasons. Growth, yield and yield components of sunflower as well as seed oil% were significantly affected by increasing N fertilizer levels from 40 to 50 up to 60 kg N / fed in both seasons, except number of leaves / plant was not significantly affected. Interaction between intercropping patterns and N fertilizer levels significantly affected number of seeds / head, seed yield /fed and oil % in both seasons and head diameter in the second season only. Competitive relationship : Results revealed also that intercropping pattern of 100 % peanut +50 % sunflower (planting sunflower on the second ridge of peanut at 20 cm apart between hills and thinned on one plant / hill) recorded the highest values for Land Equivalent Ratio (LER), which reached 1.48 and 1.57 in the first and second seasons, respectively, Relative Crowding Coefficient (RCC) achieved advantageous by intercropping pattern in both seasons. Sunflower crop was the dominant in all intercropping patterns and peanut was the dominated in both seasons. Intercropping patterns 100 % peanut + 50 % sunflower on the second ridge at 20 cm between hills and thinned on one plant/ hill achieved the highest value for total income in both seasons being 28.85 and 33.03 % compared to peanut alone in the first and second seasons , respectively .

Combining Ability Analysis of Yield and Yield Components in Sunflower

Combining Ability Analysis of Yield and Yield Components in Sunflower

Combining ability for oil content and its correlations with other yield components in sunflower (helianthus annuus l)

Oil yield is a major characteristic of each sunflower hybrid (Skoric et al 2005). To be able to develop new high-oil sunflower hybrids by the method of interspecific hybridization, it is necessary to have information on mode of inheritance and combining abilities of inbred lines used. When selecting prospective lines as components of future hybrids, it is important to know correlations between yield components on one side and oil content on another. Seven new divergent cytoplasmic male sterile lines (A) developed by interspecific hybridization, three Rf-restorer lines used as testers and 21 F1 hybrids have been subjected to the line × tester analysis. Significant differences have been obtained in mean values for all characteristics under study. Significant differences were found between A lines and R lines on one side and their F1 hybrids on the other in oil content, plant height, head diameter, total number of seeds per head, 1000-seed weight and seed yield per plant. The line NS-GS-4 exhibited a highly significant positive GCA value for oil content. The line NS-GS-5 had a highly significant negative GCA value for oil content. The hybrid NS-GS-6 × RHA-R-PL-2/1 had a highly significant positive SCA value for oil content. Non-additive component of genetic variance played the main role in the inheritance of oil content, as indicated by the analysis of variance of combining abilities and the analysis of components of genetic variance. Further confirmation was the ratio GCA/SCA for oil content in the F1 generation which was smaller than unity (0.33). The highest average contribution to the expression of oil content (77.3%) was exhibited by the A lines. Highly significant negative correlations were found between oil content on one side and head diameter, total number of seed per head, 1000-seed weight and seed yield per plant on the other.