Introduced cultivars of green jujube (Zizyphus mauritianaAaink) were cultivated in greenhouses at Chaoyang, north China's Liaoning Province and Changping, Beijing. Contrast trials about biological and photosynthetic characteristics, leaf nutrition and biological properties of pollen were carried out. Relevant planting, training, pruning and propagation methods were studied. The cultivars suitable to be cultivated in greenhouses in Northern China were selected. The corresponding agronomic techniques and prop...