A total of 96 hybrids from four maturity groups (FAO 200, 300, 400, 500) were tested in two years (2006, 2007) at two locations in Hungary (Martonvásár, Szarvas). Considerable differences were found between the years for the grain yield per hectare and for the grain quality parameters. In 2006 record yields were achieved at both locations, averaging 11.61 t/ha in Martonvásár and 12.20 t/ha in Szarvas, due primarily to well-timed irrigation in Martonvásár and to good rainfall supplies in Szarvas. In 2007 both locations suffered from drought, with less rainfall than average during the critical months of the vegetation period, which was partially compensated for by irrigation in Martonvásár, giving a yield average of 5.96 t/ha, while the hybrids grown in Szarvas had a yield average of 5.06 t/ha. The grain quality parameters exhibited a close correlation with the grain yield in the individual FAO maturity groups. Hybrids of the flint type, which have a short vegetation period, had high protein and oil contents, but the yield averages were low due to the slower rate of starch incorporation. Hybrids of the dent type have a longer vegetation period and more intense carbohydrate accumulation, but low protein and oil contents. In wet years and locations there was a higher rate of starch accumulation, while dry years are favourable for protein and oil accumulation. The Bravais correlation coefficient was calculated between the yield and the grain quality parameters (averaged over years, locations and varieties). A positive, moderately strong correlation (0.68) was found between the yield and the starch content, a negative, moderately strong correlation (−0.52) between the yield and the protein content, and a loose negative correlation (−0.19) between the yield and the oil content.
Bálint, A. (1977): A fehérjeképződés genetikája. (Genetics of protein formation.) pp. 107–122. In: Bálint, A. (ed.), Gazdasági növényeink produkciógenetikája . (Production genetics of crops.) Akadémiai Kiadó, Budapest.
Bálint A. , '', in Gazdasági növényeink produkciógenetikája , (1977 ) -.
Berényi, D. (1945): A kukorica termelése és összefüggése az időjárással . (Maize production and its relationship with the weather.) Alföldi magvető. Debrecen. pp. 134–173.
Berényi D. , '', in A kukorica termelése és összefüggése az időjárással , (1945 ) -.
Gyenesne-Hegyi, Z., Kizmus, L., Záborszky, S., Marton, L. C. (2001): Trends in the protein and oil contents and thousand kernel mass of maize under various ecological conditions. Növénytermelés , 50 , 385–394.
Marton L. C. , 'Trends in the protein and oil contents and thousand kernel mass of maize under various ecological conditions ' (2001 ) 50 Növénytermelés : 385 -394 .
Gyenesné-Hegyi, Z., Pók, I., Illés, O., Szőke, C., Kizmus, L., Marton, L. C. (2002): Effect of growing site, plant density and year on the yield components of maize hybrids. Növénytermelés , 51 , 425–435.
Marton L. C. , 'Effect of growing site, plant density and year on the yield components of maize hybrids ' (2002 ) 51 Növénytermelés : 425 -435 .
Hegyi, Z., Pók, I., Szőke, C., Pintér, J. (2007): Chemical quality parameters of maize hybrids in various FAO maturity groups as correlated with yield and yield components. Acta Agron. Hung. , 55 , 217–225.
Pintér J. , 'Chemical quality parameters of maize hybrids in various FAO maturity groups as correlated with yield and yield components ' (2007 ) 55 Acta Agron. Hung. : 217 -225 .
Hegyi, Z., Spitkó, T., Szőke, C., Rácz, F., Berzy, T., Pintér, J., Marton, L. C. (2005): Studies on the adaptability of maize hybrids under various ecological conditions. Cereal Res. Comm. , 33 , 689–696.
Marton L. C. , 'Studies on the adaptability of maize hybrids under various ecological conditions ' (2005 ) 33 Cereal Res. Comm. : 689 -696 .
Josipovic, M., Jambrovic, A., Plavsic, H., Liovic, I., Sostaric, J. (2007): Responses of grain composition traits to high plant density in irrigated maize hybrids. Cereal Res. Comm. , 35 , 549–552.
Sostaric J. , 'Responses of grain composition traits to high plant density in irrigated maize hybrids ' (2007 ) 35 Cereal Res. Comm. : 549 -552 .
Menyhért, Z. (1979): Kukoricáról a termelőknek . (About maize for farmers.) Mezőgazdasági Kiadó. Budapest.
Menyhért Z. , '', in Kukoricáról a termelőknek , (1979 ) -.
Mertz, E. T. (1992): Quality protein maize . AACC. St. Paul. p. 294.
Mertz E. T. , '', in Quality protein maize , (1992 ) -.
Pásztor, K., Győri, Z. (1991 ): Nagy lizintartalmú kukoricahibridek aminosavösszetételének változása . (Changes in the amino acid composition of maize hybrids with high lysine contents.) A DATE Tudományos Közleményei. Debrecen. XXX. pp. 117–133.
Győri Z. , '', in Nagy lizintartalmú kukoricahibridek aminosavösszetételének változása , (1991 ) -.
Pásztor, K., Győry, Z., Szilágyi, S. (1998): Changes in the protein, starch, ash, fibre and fat contents of maize parental lines and their hybrids. Növénytermelés , 47 , 271–278.
Szilágyi S. , 'Changes in the protein, starch, ash, fibre and fat contents of maize parental lines and their hybrids ' (1998 ) 47 Növénytermelés : 271 -278 .
Pepó, P., Kovács, A., Tóth, S., Bódi, Z. (2007): Investigation of maize hybrids based on direct and reciprocal crosses. Cereal Res. Comm. , 35 , 913–916.
Bódi Z. , 'Investigation of maize hybrids based on direct and reciprocal crosses ' (2007 ) 35 Cereal Res. Comm. : 913 -916 .
Polerecky, O. (1976): Yield and yield components of newly-bred high-yielding grain maize hybrids. Rostlinna Vyroba , 22 , 1021–1027.
Polerecky O. , 'Yield and yield components of newly-bred high-yielding grain maize hybrids ' (1976 ) 22 Rostlinna Vyroba : 1021 -1027 .
Prokszáné Paplogó, Z., Széll, E., Kovácsné Komlós, M. (1995): The effect of N-fertilisation on the yield and on several traits of maize under different seasonal effects on meadow silty soil. Növénytermelés , 44 , 33–42.
Kovácsné Komlós M. , 'The effect of N-fertilisation on the yield and on several traits of maize under different seasonal effects on meadow silty soil ' (1995 ) 44 Növénytermelés : 33 -42 .
Quaranta, F., Fornara, M., Mazzon, V. (2001): Maize with limited water supply: comparative tests between 68 hybrids of class 400 and 500. Informatore-Agrario , 57 , 55–58.
Mazzon V. , 'Maize with limited water supply: comparative tests between 68 hybrids of class 400 and 500 ' (2001 ) 57 Informatore-Agrario : 55 -58 .
Sprague, G. F. (ed.) (1977): Corn and Corn Improvement . American Society of Agronomy, Madison, Wisconsin.
'', in Corn and Corn Improvement , (1977 ) -.
Svecnjak, Z., Varga, B., Grbesa, D., Pospisil, M., Macesic, D. (2007): Environmental and management effects on grain quality of maize hybrids. Cereal Res. Comm. , 35 , 1117–1120.
Macesic D. , 'Environmental and management effects on grain quality of maize hybrids ' (2007 ) 35 Cereal Res. Comm. : 1117 -1120 .
Zinselmeier, C., Westgate, M. E., Schussler, J. R., Jones, R. J. (1995): Low water potential disrupts carbohydrate metabolism in maize ( Zea mays L.) ovaries. Plant Physiology , 107 , 385–391.
Jones R. J. , 'Low water potential disrupts carbohydrate metabolism in maize (Zea mays L.) ovaries ' (1995 ) 107 Plant Physiology : 385 -391 .