Abstract:

In order to improve the yield and quality of walnut in southern Hebei Taihang Mountains, the experiment of fertilization and irrigation on yield, dried weight, kernel rate and the trunk circumference growth of 7-year-old adult trees of Juglans regia ‘Liaoning 1’ cultivated in field was conducted by orthogonal design. Conclusions were as follows: (1) Irrigation frequency and the irrigation amount were the key factors to walnut yield and dried weight. With the increase of irrigation frequency and irrigation amount, the walnut yield and dried weight were significantly increased. (2) Irrigation amount and the amount of added potassium were the key factors of affected kernel walnut rate; Irrigation amount and added nitrogen fertilizer were critical factors on trunk circumference growth. (3) From a comprehensive appraisal of view, each irrigation at 750~975 m3/hm2 and 2 or 3 times irrigation in a year can be a combination of high walnut yield and dried weight. (4) The walnut kernel rate of different combinations was no significant difference. Therefore, Effects of irrigation on yield and dried weight were greater than that of fertilization. Irrigation was the prerequisites to ensure yield, quality and the tree growth.