Combined Effects Of Nitrogen Fertilizer And Nano-carbon On Rice Grow And Physiological Ecology Of Saline-alkali Soil

To investigate the effects of combined application of nitrogen fertilizer and nano-carbon on saline-alkali land rice Physiology and Ecology, six treatments were applied as a randomized complete block design with three replications including A1:100%nitrogen rate+nano-carbon, A2:70%nitrogen rate+nano-carbon, A3:50%nitrogen rate+nano-carbon, and B,:100%nitrogen rate, B2:70%nitrogen rate, B3:50%nitrogen rate is CK,respectively.The tiller number, dry matter accumulation, photosynthetic physiological and ecological characteristics of biomass, nitrogen use efficiency, the soil total and available N, and yield of rice were studied.The main results of field test are as follows:1. On rice growth and biomass studies have shown that in the whole growth period of rice, adding nano-carbon treatments increased plant height and tiller number, expanding the photosynthetic leaf area, high rice biomass.In dough stage, the plant height、 tiller number、 dry biomass and yield of all treatments adding nano-carbon treatments were higher than those in treatments which only applied nitrogenous fertilizer, especially in the late growth stage of rice, more significant difference between treatment and CK. Increased in the number of tillers, and expand the leaf area of rice photosynthesis, and nano-carbon treatment obtain higher yields ultimate, In the present study, treatment B1and treatment A2in plant height, tiller number, leaf area index, biomass and yield differences are not significant. Get the same biomass production of the conventional nitrogen rate, allows nitrogen reduced by nearly30%after adding nano-carbon. Economic benefit analysis that conventional nitrogen application to add the nano-carbon in general ha increase the effectiveness of3,000yuan.2. Rice photosynthetic physiological ecology studies have shown that the whole growth period, the net photosynthetic rate, stomatal conductance, intercellular CO2concentration and transpiration rate is a single peak curve, the heading stage to the maximum, dough stage is the lowest value. In the same nutrition condition, leaf net photosynthetic rate, stomatal conductance, intercellular CO2concentration and transpiration rate adding nano-carbon treatments were higher than single nitrogen treatments. The nano-carbon treatments can enhance the net photosynthetic rate of rice, maintain a higher stomatal conductance, whice is the basis for the increase in the population dry matter production. Most importantly, the nano-carbon treatments can save nitrogen nearly30%.3. The study of rice leaf physiological traits have shown that the whole growth period, The leaf chlorophyll content, soluble sugar content, soluble protein content, peroxidase activity,the nano-carbon treatments were higher than single nitrogen treatments. Especially in the late growth stage of rice, more significant difference between treatment and CK, The nano-carbon nitrogen have a sustained release characteristics. MDA content of nano-carbon treatment is lower than CK, that show nitrogen adding the nano-carbon treatments can reduce the damage of the cell membrane system, this is probably the main physiological reason that causes higher production of nano-carbon treatments.4. The findings of rice nitrogen use efficiency and soil nitrogen residue that215kg hm-2,150kg hm-2, and107.5kg hm-2three kinds of nitrogen levels, nitrogen agronomic efficiency of adding the nano-carbon treatments were30.04%%18.33%%25.94%higher than single nitrogen treatments, respectively; nitrogen partial productivity of adding the nano-carbon treatments were15.84%%8.51%and8.37%lower than single nitrogen treatments, respectively, soil total nitrogen content of adding the nano-carbon treatments were6.95%,8.48%and9.65%lower than single nitrogen treatments, respectively; soil available nitrogen content of adding the nano-carbon treatments were5.46%%5.38%and6.27%lower than single nitrogen treatments, respectively.In this experimental condition, the nano-carbon treatments can save nitrogen nearly30%.This can reduce the environmental pollution caused due to nitrogen fertilization.