Walnut Clonal Evaluation And Selection For Chengdu Plain Cultivation

Over the past decade, introduction and cultivation the northen walnut varieties in Sichuan and Chongqing is large-scale. Like Xiangling,8518, LuGuang,Liao, ShanLin series and other northern early-fruiting walnut varieties. Due to the warm and humid climate of the northern region, many seriously problems hampered the healthy development of the walnut industry like poor adaptability, weak growth potential, serious diseases, and low yield. Walnut breeding in Sichuan started late,and lack of varieties adapt for humid climate of the Sichuan Basin.It is hard to meet the needs of walnut industrial development. For breeding fine varieties with good ecological adaptability of humid climate and on the basis of the early work in the native plus-tree selection, cloning and clonal test, this study evacuated about 69 native walnut clones for its’ ecological adaptability of humidity climate, early-fruiting capability and nuts quality. there are some fine clones with ecological adaptability, early-fruiting ability and good nuts quality.Then combined with flowering investigation configure to filter out the pollination clones corresponding for fine clones. The main conclusions are as follows:(1) Subject clones adaptability in the Chengdu Plain humid climate varies large. Particular in the surviving rate, diameter, crown width. Most of the local walnut showed good adaptability, but there are also a small number of clones to low survival rate, weak growth potential and poor adaptability. By surviving rate and adaptability evaluation a number of adaptive good clones ffilter out for further screening.(2) Tested clones are significant different in the early-fruiting ability. In the 69 subject clones, there are 30 in fruition; A large number of different clones of differences. After the evaluation of early-fruiting ability, binding the early evacuation results further filtered out eight fine clones.(3) There are significant differences in nut quality. Indexes like shell thickness, difficulty to take kernal, kernal-rate and the taste. As reference index like nut size, fruit weight, fat and protein content of the. further screened three clones 65,100.199 as cultivars Clones.(4) Flowering time lasts from March 17 to April 15,over 28 day.There are 19 clones for male first type, with 12 clones of female first type; There are 2 homogamy clones.(5) Through adaptivity, early-fruiting, nut quality evaluation and selection step by step, combined with flowering investigation, this study finally selected 3 main cultivars Clones:65,100,199; 3 pollination clones 169,52,105.