Effects Of Nitrogen、phosphorus And Potassium On Growing And Physiological Characteristics In Two Cloves Under Flooding Stress

Syringa with various advantages including strong growth ability, graceful, easy cultivation and management, is commonly used as garden greening tree species in the north of China. Despite it has a strong adaptability to varieties of environmental stress, Syringa is vulnerable to the waterlogging. In this study, the test selected Landscaping common lilac as test material. Research under flooding stress treatment, NPK fertilization on annual lilac, lilac lobular physiological and metabolic effects of chlorophyll in photosynthesis direction, after analysis of resistance to adversity by comparing two cloves fertilization.1. Flooding affected NPK fertilization on the growth of Syringa of stress. Under waterlogging stress, two cloves of growth have been inhibited. In univariate effect function, N fertilizer promoted under the stress on the obvious two cloves, P fertilizer will inhibit the growth of the role plays, K fertilizer on height growth after two cloves flooding has affected significantly improved. Affected by a single clove leaflets which fertilization is more obvious than lilac. Two factors that effect the function, two cloves flooding stress are present NP, NK, PK interaction. Promote the role of NK fertilizer lilac most obvious after lobular cloves flooding NP, NK interaction effects are negative, indicating that the flooding PK fertilizer N and mitigate the effects of the interaction can cause the growth of lobular cloves. Three dimensional effect function displays N, P, K with a maximum height above the application generates a single factor and two-factor fertilization fertilization, Syringa oblata suggested per plant N1.04g, P0.56g, K2.39g, the maximum height of2.38cm. Optimum amount of fertilizer per plant under normal conditions N1.19g, P0.45g, K2.47g, the maximum height of2.47cm. In Sytinga microphylla N2.01g, P0.81g, K2.63g, the maximum height of1.87cm. Optimum amount of fertilizer per plant under normal conditions N1.81g, P0.94g, K1.94g, the maximum height of1.98cm. By contrast the indicators suggest that growth is higher than the volume fertilization treatments without fertilization treatment, the percentage of nitrogen deficiency treatment relative yield significantly lower potassium deficiency and treatment,Flooding Stress on the height of the elements affecting K2O> N> P2O5. Syringa oblata fertilization treatment to N2P2K1best, Sytinga microphylla to N2P2K3best. Syringa oblata and Sytinga microphylla growth under flooding stress and the amount of potassium significant positive correlation was significantly associated with nitrogen fertilizer with phosphorus amount not significant.2. Flooding Stress NPK fertilizer under the influence of Sytinga and net photosynthetic rate of chlorophyll. Nitrogen and phosphorus can contribute to the stability of chlorophyll synthesis and improve the rate of photosynthetic phosphorylation, increased nitrogen in leaves, leaf photosynthesis would increase the area of light and time has been extended, carboxylase activity increases foliar units, thus demonstrating the ability of nitrogen and photosynthesis showed a positive correlation trend. Flooding initial stress lilac seedlings net photosynthetic rate decreased, indicating excessive moisture, the stomatal aperture clove seedlings reduced, Tr decreased less CO2outside into quantitative leaf cells, resulting in a net photosynthetic rate. Effect of Nitrogen on Syringa oblata net photosynthetic rate of the more obvious, indicating the suitable concentration of nitrogen fertilizer can significantly alleviate flooding lilac seedlings decreased Pn under stress, but it is not obvious when the concentration is too high, the smaller the impact of potash on the photosynthesis of plants. The results of this experiment shows that there are differences between different NPK fertilizer on photosynthetic capacity cloves. When the amount of NPK application, chlorophyll content and net photosynthetic rate are strong, high light efficiency last longer, so the organization can promote the accumulation of dry matter, so as to promote good growth.3. Effects of NPK fertilization of physiological indicators in Syringa under flooding stress. NPK fertilizer on a variety of physiological indicators Syringa oblata and Sytinga microphylla have a significant impact. In the initial flooding, Syringa oblata and Sytinga microphylla decline of SOD activity than the control, SOD with increasing amount of fertilizer increases. POD activity in the early fall less stress, with increasing amounts of NPK fertilizer while showing a clear upward trend, But when the cast of excess nitrogen. POD activity is decreasing. With prolonged waterlogging stress time, two cloves activity trends are higher than the control plants may be due to different degrees of salt stress and thus by increasing the activity of a variety of protective enzymes reduce the degree of injury. Test POD activity changes after different treatments obviously not as good as SOD, POD may be due to be digested by H2O2in the oxidation of the corresponding matrix, The increase in SOD activity are accompanied by the threat of flooding and improved time-bound, but also to enhance the degree of threat associated with leaving the activity gradually increased, which may be due to appear in the body submerged plants prompted a lot of reactive oxygen species induced protective enzyme system conducive to enhancing SOD activity in order to go in addition to reactive oxygen species, reduced the damage. By comparing the indicators show that nitrogen and potassium reasonable ratio, two cloves of activity has a protective effect is enhanced, phosphate physiological characteristics of the two cloves of little effect. The various indicators of activity than Syringa oblata high, indicating that after fertilization Sytinga microphylla stronger anti flooded.