EFFECTS OF GRAFTING ROOTSTOCKS, SEASONS AND METHODS ON SPROUTING RATE AND SHOOT GROWTH OF SUGAR APPLE LINE Na16 (Annona squamosa) IN THE NURSERY STAGE

Abstract

The sugar apple line Na16 (Annona squamosa) selected from production by the Fruit and Vegetable Research Institute had a variety of valuable attributes. In order to improve the efficiency of the sugar apple line Na16 production, the study on the influence of grafting rootstocks, seasons and methods to the sprouting rate and growth of grafted plants in the nursery stage was conducted from January 2020 to December 2021. The research results indicated that suitable sugar apple rootstocks included the two varieties Na Dai and Na Bo, and grafting in Ha Noi from January 20 to January 25 found to be most favorable. The sprouting percentage of Na16 plants grafted by side graftingduring this period reached over 90% and the success rate ranged from 73.61 to 75.28%.