关键词: 杨树, 杨树, 材积, 生长规律

Abstract: Zhangjiakou area which is located along the great wall belongs to semi-arid area with only 350-400 mm average annual precipitation. The contradiction between farmland water shortage and crop water requirement limits agricultural development of the area, therefore, its key measure for agricultural sustainable development to apply and conserve limited rain resources. ‘Zhangzagu’ hybrid millet which is the achievement made by our academy with independent intellectual property rights has been promoted nearly 67.5 million hm2 in arid and semi-arid area in North China. To maximize yield potential of hybrid millet, this experiment took ‘Zhangzagu’ hybrid mille and Hamming brand water retaining agent as test material and used single factor completely random design method to study the effect of seedling transplanting with different radio of water retaining agent and soil on growth characteristics of hybrid millet. Experiment result showed that the most suitable ratio of base material combined water retaining agent and soil was 1:100.