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166 V. VEUCAN şi colab., Stabilirea dozelor de îngrăşăminte în funcţie de NPK.<br />

300-400 q/ha, dar nu s-a reuşit să se obţină 500 q/lha din cauza soiurilor<br />

şi a elementelor 111eteorologice, care au limitat valorifkarea rezervelor<br />

din soL<br />

3. S-au obţinut prodUJcţii mai mari dedt cele planificate prin calcul,<br />

la \Tariante.Le martor şi N 20 P 20, prin mobilizarea reze,rve'lor potenţiale<br />

ale's'olului, în urma aplicării unor lucrări raţionale în cadrul unui aso'"<br />

lament.<br />

BIBLIOGRlA,FIF:<br />

V'ELIOAfN, V., SALONTtAJI, AL., MUNT,EANU, L., 1970, Cerceităriprivind 7'elaţi:L<br />

îngrăşăminte-producţie la grîu de toamnă. Vucrări ştiinţifiice Ins. A. Cluj:"<br />

Nia!poc'a. Seria AgrkfUltuI1ă, XXVI.<br />

'VELJJCAJN, V., OERiNEA, SANDA, MUT:E'A.NU, L., 1970, Cercetări privind utilizarea<br />

îng:ră;şămintelor de către pOirumb şi îngrăşarea !lui raţională. Lucrări ştiinţifice,<br />

InlSt. Arg. Cluj-Napoica, Seria Agricultură, XXVI.<br />

RESEARCHES ON THE POSSliBILITY TO ESTAJBLISH THE FERTILIZER<br />

LEVELS NECESSARY FOR A CERT!A[N YIELD LEVEL AS A FUNCTION<br />

OF N, P, K SUPiPLY OF THE SOH.<br />

SUMMA.RY<br />

Ferrtilizer le;vels necessary in ardeI' rto obtain potato yields of 200..;...-500 q/ha<br />

as a fun'C'tion of nitrogen, plhosphorus and potassium soi:! supply were eva'lUiated and<br />

applied. AntiiCipaited yields of 300-400 q/ha were obtained with fertilizer apiplkations.<br />

The meiteorologic conditions as well as the ,cropped varieties proved ta be<br />

hmitting f.acrtors in the utilization of soH supp1y, Le. clid not d110W ta obtain yie1ds<br />

as high as ·500 q potata tuhersjha. Yields exceeding the lervels anti!Ciparbed in our<br />

ev,allUa;J;ions (Le. 180-200 qj'ha) were obtained in case of N 20 P 20 and control variants<br />

owirug to a moreeffident utiilizartion of soi[ potential nutrient swrage following<br />

the appUcation of certain saH preparation works in a crop ratation. The soH supply<br />

af different n:uitrients, yielding 'capacity of the potHta V1arieties as well as dimatic<br />

conditions have to be taken inta aocount for establishing fertmizer levels to be<br />

applied an potatoes.<br />

FORSCHUNiGEN BETREiFF'ElND DIE MOGUCHKEIT DER FESTSTELLUNG<br />

DER DOSEN CHEM'ISCHER DUNGEM,ITTEL FUR EIN ESTTMMTEN:<br />

ERNTENIVE'AU IM VERHĂLTNIS ZU DEN N, P, K - RESERVEN<br />

DES !BODENS<br />

ZUSAMME:N'FASSUNG<br />

Es werden die Dosen chemischer Dungemittel berechnet 'Dnd angewallldt, die<br />

erforrlerlich sind, fUm eine KaritoffelproduMion von 200-500 q/ha, im Verha:Ltnis<br />

zu den Stkk:s,toff-, Phosphor- und Kaliumreser;ven des Bodellls, zu erzeugeil1.<br />

Es ist derart măgHch gewesen die gep[ante Produktion von 300-400 qjha<br />

zu erzielen. Die Produktion von 500 q/ha wurde nicht erreicht, und dies wegen

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