The Evaluation On Variety Resources Of Black Currant

Twelve varieties of Black Currant inside country and outside in the research were studied from several aspects, such as the observation of the phonological period, flower run off , fruit setting , the growth trend of new branch and the nutrient ingredients in juice and so on .Some regulations will be realized through this study , including the habit of flower opening and fruit setting , the mutual relations between new branch growth and flower opening or fruit setting , the same and difference of flower period length , percent of flower running off and fruit setting ; Study the factors relating with yield ; Measure the contents of the sugar ,acidity, Vc ,color value and distinguish the height of nutrient ingredients in different varieties .The trial rows will be harvested on five separate dates , and on each harvesting determine the degree of fruit maturity , the percent of fruit run-off when waved by hand until no fruit drop , the percent of rotten fruits , and the changing trend of nutrient ingredients on the separate dates, and at last evaluate the optical harvest dates ;The excellent variety will be appraised from fruit characters, fruits flavor, the nutrition in juice , the trait for machine harvest, the yield and the length of optical harvest time , and will be cultivated and popularized as the prior variety in Ji Lin province .The followed conclusions were obtained from the study.The varieties, S2, S3, S4, S5, S6, showed the characters of late flowers , so they could avoid the hurt by low temperature during flower opening.The fruits on the strings after 3 weeks since the flower opened would drop constantly specially the fruits on the top part of strings. This phenomenon was very serious on the varieties of The leaves of S1 were dense when flower opened and fruit set, which maybe protect the strings against sunshine and the top of strings and young fruits did not dry and drop. S1 was the best genotype of fruit setting because the ultimate percent of fruit setting was highest; As far as concern of fruit number and weight, yield depends on the quantities of bearing branches, node number of each branch, flower number of each node, the ultimate percent of fruit setting and theaverage weight of fruitsWhen flower open , fruit set and the new branch grow quickly, pay attention to the management of fertilizer and irrigation; After the harvest the second fastigium of new branch growth did not appear. Only some varieties displayed a short quick growth before harvest.Vitamin C contents of S1, S3 were superior, and the next was S4, S5. Color values of Ben Nevis and S4 were dominant in the third harvest, but S3 was also higher in the forth harvest; The acidities of S1, Ben Lomond , Ben Nevis were higher in appropriate harvests respectively. Higher in sugar contents were Brodrop, Risager , Fertodi, S3,S4,S2,S1. Better in fruit flavor were S3,S4 ,S5 , Risager, Fertodi.The nutrient ingredients showed that their own variational regulations. The contents of Vc decreased constantly from 1 st to 5th harvest; The acidities and color values showed that the highest value appeared at the 3rd or 4th harvest; and the highest sugar content appeared at the 2nd, 3rd, 4th or 5th. harvest.The proper harvesting date for processing was 4th and 8th days after 90% fruits turn to black. However, the harvest date should be different for the different variety. For fresh food, the harvest may be carried out between 8th and 16th day .after 90% black.Comprehensive evaluation : S3 was the best variety ,which was fit for large cultivation , because of the resistant to the low temperature in the flower period ,highest yield , adaptability of machine harvest ,the longer harvest time ,the higher contents of Vc sugar and color value ,and the better flavor.