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yield and grain quality. Cereal Res. Commun. , 34 , 669–672. Sikora S. Contribution of breeding to increasing soybean grain yield and grain quality

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, T.M., Kotecha, A., Reinbergs, E., Song, L.S.P., Fejer, S.O. 1986. Diallel analysis of grain yield in barley using doubled haploid lines. Plant Breed. 97 :129–137. Fejer S

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. 1996 36 1590 1595 Passioura, J.B. 1977. Grain yield, harvest index, and water use of wheat. Journal of the Australian

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Blanche, S.B., Utomo, H.S., Wenefrida, I., Myers, G.O. 2009. Genotype × environment interactions of hybrid and varietal rice cultivars for grain yield and milling quality. Crop Sci. 49 :2011–2018. Myers G

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Kondora, C., Szabó, M., Máté, A., Szabó, G. (2000): Adaptability of winter wheat varieties based on their grain yield results. Acta Agron. Hung. , 48 , 203–207. Szabó G. Adaptability

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Eight different tillage systems were compared in soybean production on one experimental field (chernozem) located in the Baranya region of Croatia over a 4-year period (2001/2002, 2002/2003, 2003/2004, 2004/2005). The dry conditions experienced in 2003 exacerbated the effects of NT and CWNS on the soybean yield. The most stable grain yield was obtained using CSNW and CSDW in all four experimental years. DH, CH and CWDS did not result in any significant reduction in crop yield compared to CT. There was no clear trend regarding the applied tillage systems and grain yield components. The greatest effects on soybean yield and yield components were due to climatic conditions. Different tillage systems had a significant effect on the soybean grain yield and yield components in the four experimental years. The largest differences in stem height were determined between CSNW and NT. The number of pods per plant, the hectolitre mass and the grain yield were significantly lower under NT than under the other tillage systems. The number of fertile nodes of soybean and the number of branches per plant in the experimental years had approximately the same values for all the tillage systems. To sum up, the results achieved with DH, CH, CSDW, CWDS and CSNW were on par with each other and slightly better than CT, and these systems could represent adequate replacements for conventional tillage. No tillage could not be considered as the most favourable for soybean growing.

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