Research on Early-bearing and High-yielding Technique of Date Tree

The experimental plantation of 20.7 ha was established with seedlings of 2-year-old for research on early-bearing and high-yielding technique of Zizyphus jujuba in 1987 in Jishan County,Shanxi Province.The integrated measures (mainly conical brachysm cultivation) were applied.The results showed that the measures could remarkably increase the fruit yield.In the third year after planting,the mean yield of fresh fruit was 878 kg/ha in the plantation with a density of 360 trees/ha and 3113 kg/ha in the plantation with a density of 1245 trees/ha.In the fourth year after planting,the mean yield of the plantation with the density of 360 trees/ha,1940 kg/ha,was 4 times over that of the control,and the mean yield of the plantation with the density of 1245 trees/ha,7595 kg/ha,was 8 times over that of the control.The ratios of input to output were 1:7 and 1:13 respectively.