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Using of chemical means in detrimental rodents control is an important way for diminution of rodent’s populations and their damages. In this paper we have identified all methods for application of these chemical means in deratization practice. Methods for raticides application are:using of spraying;using of toxic baits;poisoning of watering sources;the gasification of galleries.

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).