(2)the economic benefit of planting Euphoria longan is 12.8 times,7.68 times more than planting Pinus elliottii and crops, the economic benefit of planting Litchi chinensis is 9.02 times,5.41 times more than planting Pinus elliottii and crops.
Longan(Euphoria longan Lam .) yellow pigm ent (R) w ith features of pH 4.52,λRm ax= 370 nm and brightyellow color w as obtained under the optim um extraction condition ofethylalco- holto rind of Longan[100∶4(v/w )],70 ℃and 100 m in .
在乙醇：龙眼果皮＝ 100∶4（v／w ）、70 ℃、100 m in 的最佳条件下，pH 4．52，λRmax＝ 370 nm ，呈鲜黄色。
The dynamic variation in content of cndogenous abscisic acid (ABA ),indoleacetic acid (IAA ),gibberellins (GAs)and isopentenyladenodines (iPAs ) of normal juvenilefruit and dropped fruit was measured with enzyme linked immunosorbent assay (ELLSA)in the course of physiological fruit drop of 'Shuizhang Longan(Euphoria longan).
Effects of Ca and B nutrient on quality and storage of longan fruit were discussed under the condition of lacking of boron nutrient in soil, and spraying three times on leaves and fruits with 1%CaCl2, 0.2%H3BO3, 1%CaCl2+0.2%H3BO3 solutions and water(CK) respectively during the developmental stage of longan aril.
With longan seed as the study material, the extracts of longan seed were studied which the extract solvents were water, absolut alcohol, methanol and 50% methanol, and the inhibition of longan seed extracts on α-glucosidase were also determined.