THE FREQUENCY OF SELF-FERTILE VARIETIES OF PLUMS AND DATA CONCERNING THEIR UTILITY
It may be useful to reduce the number of varieties grown in modern commercial large scale plantations from the point of view of the organization of work and marketing. There are, however, several circumstances limiting this reduction, among others also the conditions of fertilization.
There are several varieties of plums of domestic origin grown in our country, the conditions of fertilization of which are not known.
This is why we started experiments to investigate the conditions of fertilization on a large collection of various varieties of plums whithin the framework of a program set forth to determine the utility of various varieties. The varieties involved in the program belong to the species Prunus domestica L. except of the variety Alutscha which belongs to the species P.cerasifera Ehrh.