| In this paper, dongkui red bayberry was selected as experimental material. Study on root-control technology,the rule of water requirement and the effect of different microbial fertilizers. The aim is providing scientific basis for root-control seeding of Myrica rubra and the application of efficient cultivation techniques. The nutrition growth, photosynthesis, physiological and biochemical characteristics of Myrica, which treated respectively with different measures were studied by the experimentation of the root-control,different control in moisture grads and different quantity of different microbial fertilizers . The results are as follows:1. Root-control seedlings were grown better than ordinary container seedlings, and each indixs with significant difference. (1) Height and biomass of root-control seedlings were increased respectively 27.5% and 69.9% than ordinary container seedlings. (2) The content of chlorophyll, soluble sugar and starch were increased respectively 31.5%, 24.6%, 29.8% than ordinary container seedlings. (3) Diurnal changes of Pn of dongkui presents two peaks bouth root-control seedlings and ordinary container seedlings. root-control seedling had higher LSP and lower LCP, and photosynthetic active using radiation which was wider than normal container seedlings increased by 35.5%.2. The difference of nutrition growth, photosynthesis, physiological and biochemical characteristics were significant under different moisture gradient. (1) In nutrition growth, which stressed by the low moisture content, manifested as leaves turn yellow and wilt.The area of leaf height and biomass were positively correlated with water content, and negatively correlated with stomatal density. (2)In photosynthesis, the Amax and light utilization range were positively correlated with water content, but the bigest moisture content will make it down. The diurnal changes of Pn presents two peaks.The Amax in summer presented at about 10:00 am, and the peaks of each treatment were significantly different. The peak in fall presented at 10:00-11:00, and the peaks of each treatment were similar.The Amax in summer was about twice higher than in autumn. (3) The highest chlorophyll content was showed in the appropriate water content, and positively correlated with photosynthetic capacity. The contents of soluble sugar, proline and MDA had similar trend,which showed a growth trend in low water content. Based on integrated indixes, Myrica have different water demand in different periods.In order to satisfy its water demand in the maximum extent, and to achieve reasonable water use ,we should be control the water content in accordance with 55% to 65% (relative water content)in July, 65% to 75% in August September and October .3. The growth of Myrica were promoted significantly with the application of microbial fertilizer. (1)The height, diameter and biomass,which treatmented by different fertilizer doses ,were increased significantly by 10.6% to 44.7%, 3.3% to 30.8% and2.3% to 38.5% respectively. (2) The content of chlorophyll and soluble sugar were significantly higher than those in control ,and correlated with application rate. The content of N, P, K were increased in different extent than the control. (3) The Amax and the scope of the light use were positively related with application rate,and appropriate application could significantly improve their photosynthesis. The photosynthesis process showed similar bimodal curve. The peak of photosynthetic rate was positively correlated with the application. Based on comprehensive indexes, we could conclud that fertilizer application could significantly promote Myrica growth, and the application of 40g B microbial fertilizer per plant is appropriatly .
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