Researches Of The Compositive Effect Of Humic Acid Fertilizer On The Ginkgo Biloba Seeding

Today, the value of the ginkgo biloba is being recognized by human beings step by step, especially its medicinal value. The extract of ginkgo biloba has been used at preventing and treating the disease of cardiovascular system and cerebrovascular system, and it has a miraculous effect. The flavonids and ginkgolides are the main components of the extract of ginkgo biloba. Up to now, the synthetic mechanism of the flavonids and ginkgolides is not very clear, so we can not prosecute man-made control. At present, the methods which increase the content of the two medicinal substances are the planting, fertilizing and irrigating etc.In this thesis ,the effect of the Humic Acid Fertilizer(HAF) was studied about the growth of ginkgo biloba ? the content of foliar flavonids and the quantity of the microorganism in the soil. The results were as follows:1. There was a significant quadric relationship between the content of ginkgo biloba leaf flavonoids and the dosage of HAF. The regression equation was as following: yHAF=8.1527+ 0.0245.X-0.00006A:2, 7?=0.9788*.Under this equation, the best academic dosage of HAF was 215kg per hm2. At the same nutrient, the content of foliar flavonids which treated by HAF was increased 5.5 percent in average than that treated by CF. There was a significant different between HAF2 and CFa treatment.2. There was a evident increase of the foliar chlorophyll content by using fertilizer. And it had a significant quadric relationship between the content of chlorophyll and the dosage of HAF and CF. The content of chlorophyll a was increased 11.4 percent in average at HAF treatment than CF treatment; the content of chlorophyll b was increased 11.8 percent. The value of chlorophyll a/b declines firstly and then rised under the increasing dosage of HAF and CF.3. The activity of P can be improved by using HAF. There was a sharp increase of the available-P content under HAF treatment, and the highest content was as 3.76 times as the CK. However the content of available-P had no difference between the CF treatment and the CK. With equal-nutritional quantity, the content of available-P was obviously higher which treated by HAF than that by CF. Moreover, the content of foliar-P of ginkgowas significant enhanced which treated by HAF. From all of these, we can conclude that the utilization ratio of P can be obviously enhanced by using HAF.4. The activity of microorganism in the soil can be improved by fertilizing HAF, and the different microorganism represented different result. The activity of bacterium was improved at the highest level, and then the fungi, the ray fungi at the last. There was a significant positive correlation between the quantity of the fungi and the content of available-N, and available-P, and available-K in the soil. The quantity of bacterium and the content of available-N, and available-P manifested a significant positive correlation. And it is positive correlation between the ray rungi and the content of available-N, and available-K.5. The etiolation symptom of the ginkgo leaf can be effective meliorated by using HAF. At the late, there was a serious etiolation symptom at the treatment of CK and the CF4. But this symptom was at low-level by using HAF. And there was scarcely any etiolation symptom at the treatment of HAF 2 and...