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Stability analysis of different winter wheat genotypes in long-term experiment
Published December 16, 2012

Nowadays, due to the climate change, it is becoming increasingly important in the occasionally extreme years that the yield and the quality
parameters of a given winter wheat variety should not fluctuate at all or only slightly under similar agrotechnical conditions as a result of the year effect. In four years (2005–2008) we studied the c...hanges in the wet gluten content, gluten speading and protein content of five wheat genotypes at six fertilization levels.
In the control, it can be observed that the year had a significant effect on the wet gluten content, the protein content of the flour and gluten speading, therefore, a great fluctuation was detected in these qualities of the varieties in the four studied years. At the optimum fertilization levels (N120-150+PK), the varieties Sixtus, Saturus and Lupus showed a much lower fluctuation and more stable values were measured. The most stable variety in the control treatment was Mv Mazurka for all the three quality parameters, while at the optimum fertilization level (N120+PK), the most stable results were obtained for the variety Sixtus as an average of the four years.
When studying the results using Kang’s method for stability analysis, it can be stated that the most stable values of wet gluten content were obtained at the fertilization level of N120+PK under a variable year effect, the varieties gave also the best gluten content values at this level. The most stable protein content values of flour were obtained at the fertilization level of N60+PK. The results showed that the fluctuation of quality parameters as a result of the changing years differed between the different winter wheat varieties due to their differing genotypes, but this fluctuation could be reduced or minimized by a proper fertilization. 

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Evaluation of reaction to plant density of sunflower hybrids by regression and Kang’s stability analysis
Published December 21, 2008

The world production area and the total production of sunflower has significantly been growing. The harvested yield was 23.4 and 21.1 million ha in 2005 and 2001, respectively. The total sunflower seed production has also unexpectedly increased.
Although sunflower is produced on lower quality soils in Hungary, in 2005 the average harvested y...ield was 2.43 t ha-1, which was the highest in the world. 
Sunflower is a typical commercial plant and fits well in the crop structure. Since in terms of acreage the most significant crops are corn and cereals, the partial monoculture cultivation cannot be avoided. Sunflower production is a way to eliminate this problem, therefore it has an important role both in cultivation and ecological points of view.
Accordingly, sunflower has an important role in reducing the monoculture cultivation of some plants, as well as increasing biodiversity. Sunflower well adapts to Hungary’s climatic conditions and its production is easily practicable in our country.
The reaction of sunflower hybrids on crop density change is different. Some hybrids are more some are less sensitive to this parameter. In different crop years, the crop density optimums of the different genotypes are also different. In Hungary, the yield and quality is primarily determined by fungal infections, while viruses and bacteria are less important.
The research was conducted at the Látókép farm and Regional Research Institute of the University of Debrecen, Centre of Agricultural Sciences. The research institute is situated by Road 33,15 km from Debrecen in the Hajdúság. The duration of the experiment was seven years, 10 hybrids were examined in each year.
Two hybrids used every year, Aréna/PR and Alexandra/PR hybrids were tested by Kang’s stability analysis. We found that Alexandra/PR was most balanced at every levels of crop density. Both hybrids performed most stable yield at 65000 ha-1 crop density level and less balanced at 35000 ha-1 crop density level. As a result of improved environmental conditions, the yield increase of Aréna/PR was higher than that of Alexandra/PR.
Our regression analysis found that the maximum yield of Lympil, Louidor, Hysun 321, PR63A82 and PR64A63 hybrids were harvested at 47000-60000 plant ha-1 crop density level. The statistical analysis showed that the highest yield was harvested from Lympil and Hysun 321. As regards the crop yield, the most stable hybrids were Louidor and Lympil. The optimum crop density interval of Rigasol/PR and Larisol (58000 plant ha-1) was wider than that of Diabolo (46000 plant ha-1). The maximum yield of Larisol was higher at the optimal crop density level. As regards yield, Diabol was the most stable hybrid.
The statistical analysis on the stability of the yield of Alexandra/PR and Aréna/PR showed that Aréna/PR is more stable, and its optimal crop density level is lower than that of Alexandra/PR.

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