STUDIES ON RAISING FRUIT YIELD AND IMPROVING QUALITY OF JUJUBE BY RARE EARTH ELEMENT

The comparison experiment of spraying 300 ppm rare earth solution, 15 ppm gibberellin solution and water on jujube (Zizyphus jujuba Mill.) during blossoming period was conducted in 1988 and 1989. As a result of the studies, the average yields per tree in the treatment sprayed with 300 ppm rare earth, 15 ppm gibberellin and water are 35.3kg, 28.2kg and 18.5kg respectively. Rare earth can also improve the fruit quality. Sucrose and vitamin C content of the fruits in the treatment with 300 ppm rare earth is more than that in the treatment with 15 ppm gibberellin and water, sucrose and vitamin C content of the fruits in the treatment with 300 ppm rare earth, 15 ppm gibberellin and water are 8.842g/100g and 330.20mg/100g, 8.049g/100g and 307.92mg/100g, 8.078g/100g and 309.20mg/100g respectively. It is profitable to apply rare earth to jujube, the input to profit is approximately 1:62.3.