The Investigating Optimal Selection And Grafting Studies On Walnut Resources Of Shimian County

Walnut (Juglans regia L.) also known as walnuts, walnut, Juglans light of temperate tree species. Nutritional value is extremely rich, its trunk, root, branch, leaf, flower has certain use value, also has the very high ecological benefit. Asbestos is the Sichuan Province walnut advocate produce one of divisions, its germplasm resources utilization to a certain extent in the local walnut industry development, and local economic development. Therefore, the walnut resource of Shimian County was choosed as the object of investigation to investigate walnut resource optimization and study on grafting technique. The results were as follows:1 County walnut resource gross and structure distribution(1)By the end of 2010, the county a total of 2600 hectares planted asbestos walnut, with an annual output of 890.105 tons of fruit trees walnut,51041 strains,601891 strains did not hang strains,32 strains of plus trees; The vast majority of artificial seedling, the main cultivars of Xinjiang early fruit, Yangbi, Shannon bell, fragrance and "Chuan early hybrid" series of precocious walnut;(2) Already built tree scion nursery 20.64 hectares, annual output spikes strips 3000 or so, far from being able to meet the desired improved varieties;(3) Has high grafting walnut area of 133 hectares, the survey results showed that the Shimian County need high grafting modification for a total area of 1640 hectares, and the imperative to transform2 County tree plant characteristicsPlus Tree features mainly local asbestos:Appearance was in the groove, punctate; Fruit top, Fruit basal flat; The fruit color light, fruit surface was smooth,shell seal completely, the suture line; Nut could be easily removed, yellow, texture clear white kernel, full; The flavor was sweet; The next more degradation in; Breeding and can be promoted.3 Shimian County Walnut Grafting grafting technique.(1) The altitudes range in this research has no influence on survival rate of graft success, but still manifest a higher survival rate in medium altitude(1400m). The reduce or increase of the altitude makes the survival rate a downward trend. Different altitude have marked impact on the amount of growth and fruit. Lower or higher altitude depresses the reproductive growth of walnuts.(2) Compare with cut grafting method,grafting methods of split and then bark tongue access have significant advantage of survival rate and amount of growth and fruit.This two kinds of grafting methods have a wide range of variation, which shows the grafting method have a large room for improvement.(3) From the point of introduction of breed,Chuan zao land Yanyuan zao both have their own advantages. In comparision, Chuan zaol ripe earlier and Yanyuan zao have stronger adaptability;(4) After the graft survival rate, growth, fruiting amount of variation margin are large, indicating that affected large external uncontrollable factors, management and environmental controls need to be strengthened in the grafting process;In summary, Shimian county has rich resources of walnuts, but the resources are lack of development and utilization. Improvement of grafting method and technology, marketing dominant breeds, deep processing of walnuts and fully develop and use the existing walnuts resources in Shimian are very necessary. This investigation supplies certain scientific basis for the development, utilization and improvement for walnuts resources in Shimian.