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4CONTENTSPraf. dr. dac. GII. VALUŢĂ 71. FODOR, CECILIA BRETAN, LUCIA DRAGOMIR and N. GRĂDINARU:Variability af some characters in potato hybrid vegetative populationsand their suitability ta selection undeI' diHerent pedodimatic conditions. 9fI. GROZA: Mutagenesis as a toci in potato brecding where the first aim isa high yielding ability . . . . . . . . . . . 21ADRIANA PLĂMĂDEALA:Results in testing field resistance to Phytaphthora 37S. MUREŞAN and 1. NEGUŢI: Yield formation dynamics and quality ofsome early potato varieties . 45II. GROZA: Experiments with potata varieties carried in the private hillyzone . 55S. MAN and C. DRAICA : Studies an decreasing the spreading of the virus Yand leaf-roU in potato fields for seed praduction . 65GII. DINA: Technology of cropping early potata . . . . . . . 771. SIMIONESCU, L. SĂPLĂCAN, T. STĂNILĂ and D. HAGIANU: Ta improvetechnology of potato cropping an fields an slopes by mechanizationby a few passages. . . . . . . 89VL. IONESCU-ŞIŞEŞTI, F. CANŢAn, A. CREŢU, FL. MĂRACINEANU,1. MĂZĂREANU, Z. NAGY, C. NEGUŢI and D. SCURTU: Synthesisan research for potata irrigation. . . . . . . . . 101L. REICHBUCH, 1. IGNĂTESCU and GH. IACOB: New details concerningthe relation between fertilization and potato behaviour ta Phytophthorainfestans (Mont.) de Bary and Alternaria sp. . . . . . . 115T. BAICU, M. NĂDEJDE and IULIA ENE: Preliminary results an controllingPhytophthara infestants (Mont) de Bary by new fungicides ofsmaU volnme type 131EM. ROMAŞCU and N. STAICU : A nematode (Hexamermis sp.) parasite anColorado beetle (Leptinotarsa decemlineata Say). ... 1451. CEAUŞESCU, GH. TUŞA and M. BERINDEI : Potato production for humancansumption. . . . . . . . . . . . . . 151r: CEAUŞESCU, 1. MĂNOIU and M. BERINDEI : Seed potato multiplicatianin fields outside closed zones . 163GH. OLTEANU and GH. PAMFIL: For improving the method of measuringfoliage area an potato plants 177RUMANIAN POTATO BIBLIOGRAPHY (1969-1975) 187