Longnan City in Gansu Province is the largest base of olive production in China. In the olive orchard locating in Wudu District of Longnan City, thirty trees were sampled each of three cultivars, ‘Leccino’, ‘Chenggu32’, ‘Ezhi8’, with monoconical and vase training system. After planted with density of 5×6 m in 1992, each sample tree was investigated to determine the yield fresh fruit in five different years. The results of survey and analysis showed that there were significant differences of fruit yield among 5 years and 3 cultivars. Different canopy shapes yielded some effect on fruit setting rate and yield of different cultivars in different years. During first fruiting period in the fourth/sixth year after planting, fruit setting rate and yield of ‘Leccino’ with monocone were more 6.7% and 0.15 kg than those with vase and those of ‘Ezhi8’ and ‘Chenggu32’ with vase were more 20%, 10% and 0.18 kg, 0.09 kg than those with monocone. With the increase of tree age, fruit set and yield of ‘Leccino’ and ‘Ezhi8’ with vase was more than those of monocone. In 2011, average yields per tree of ‘Leccino’ and ‘Ezhi8’ with vase were more 13.35 kg and 6.85 kg than those with monocone. And the highest yield per tree of ‘Leccino’ with vase was 75 kg, more 16 kg than that of monocone. Fruit trees with yield over 35 kg of ‘Leccino’ and 25 kg of ‘Ezhi8’ with vase accounted for 80% and 46.7%, more 40% and 30.01% than those of monocone. It was concluded that vase training system would produce higher yield of ‘Leccino’ and ‘Ezhi8’ and its effect and advantages were gradually prominent with increase age. As for ‘Chenggu32’, monocone got a slightly higher yield than that of vase and in 2011 fruit trees with yield over 15 kg accounted for 25%, more 8.34% than vase. The difference between two training system of this cultivar was not obvious.
Aiming at meet the demand for poplar seedling in current nursery production, in this study, the stem cuttings of 1-year-old shoot and branch cuttings in middle and apical positions of 9 year-old P.×euramericana (Dode) Guineir cv.‘Neva’tree were used to conduct the propagation trial in nursery. The middle and base parts of stem and branch were taken as cuttings in this trial for comparison of survival and juvenile growth. The results showed that the survival, base diameter and height of cuttings followed the order of stem of 1-year-old shoot > branches in middle position of 9 year-old trees > branches in apical position of 9-year-old trees. The survival and growth of cuttings in space of 0.6 m×0.9 m were better than those of 0.5 m×0.6 m. The difference of sprout numbers in stool beds between the spaces of 0.5 m×1.2 m and 0.5 m×0.6 m was not significant but the base diameter and length of sprouts in space of 0.5 m×1.2 m were greater. The results further confirmed the rule that for propagation of‘Neva’, 1-year-old stem cutting survived and grew better than branch cuttings of the older trees and large planting space. It is recommended to establish fine stool bed to sprout stem cuttings with adaptable spaces in order to guarantee the quality of cuttings.