Effects of two new dryland farming technologies on growth and fruit bearing of pear jujube trees in hilly regions

Under the condition of non-irrigation,the 9 year-old pear-jujube(Ziziphus jujuba Mill.) trees [grafted on wild jujube(Ziziphus jujuba Mill.var.spinosa(Bunge) Hu ex H.F.Chow.)] was set as study material with different dryland farming technologies,which included water-saving type pruning technology,bamboo-type poly ditch technology and conventional dwarf pruning.And,comparison was made of the effects of each treatment on vegetative growth and reproduction growth of pear jujube trees.The results showed that water-saving pruning and bamboo-type contour ditch,either singly or in combination,could increase significantly the growth leaf area,the area of each leaf and the content of chlorophyll.and increase significantly the number of bearing branchlets and number of flowers.Compared with the control,water-saving pruning(HL) could raise the yield by 83.14%,and bamboo-type poly ditch(CJ) could raise it by 38.44%,while treatment HJ,combined with the HL and CJ technologies,harvested the most and the yield was 155% of the control.In Loess hilly regions in Northern Shaanxi,under the condition of non-irrigation,the water-saving pruning technology could play a main positive role in raising pear jujube yield,especially combining the bamboo-type contour ditch technology.