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For to define more accurately the precocity group of some maize hybrids depending on vegetation conditions from maize growing area, different researches analyzed the number of leaves as invariable factor dependent on hybrid. In this writing we offer dates about number of leaves for ten maize hybrids cultivated in experimental field from Varieties Testing Centre, Targoviste. Differences between hybrids were clearly and for this reason we can classify these hybrids in two precocity groups (medium early or late).

In this work, five maize hybrids were analyzed in terms of productivity elements (number of rows of grains on the cob, mass of 1000 grains, yield in grains, production per hectare) cultivated in the pedoclimatic conditions offered by Targoviste's Plain. The analyzed hybrids were Caussade, Clariti, KWS Kamelias, KWS Kinemas, Pioneer P0017, KWS 2376, hybrids of FAO 320-390 precocity group. The Pioneer P0017 hybrid was chosen as a control variant because of the frequent cultivation in the area. The study was conducted during the agricultural year 2017 in Băleni, Dâmbovița County. The results obtained highlighted values between 14 and 18 rows of grains on the cob, the mass of 1000 grains presented values between 332.7 and 435.7 grams, and the yield in grains 87.16 and 89.9%. Regarding the production of grains per hectare, the analyzed hybrids achieved high levels of this parameter, namely from 9590 to 12846 kg of grains / hectare. [ABSTRACT FROM AUTHOR]