1. -------Wang Suhua The Effect of Different Concentration of N and P in Wheat

2. CONTENTS The importance of wheat The importance of N and P N and P fertilizer

3. T he importance of wheat in the world, wheat is planted widely, it is also a kind of main food crops in our country the wheat’s area and production occupy about 25% of total food crops , Wheat is the second important crop, just after rice. With the people's living standards improved and the pace of life accelerated, the demand of wheat, especially the high quality wheat shows a grow momentum.

4. The importance of N and P Plants require a variety of nutrients and nitrogen is particularly important. From the global perspective, in all essential nutrients, nitrogen is the primary factor to limit the production and growth of plant. It also significantly improve the quality of plant. Phosphorus is one of essential nutrient elements, it is an important component of many organic compounds in plants, and it participates in various metabolisms with a variety of ways. Phosphorus also plays an important role on high crop yield and maintains the good characteristics of species.

5. N and P fertilizer Ammonia’s volatilization and denitrification may cause atmospheric pollution; Nitrogen fertilizer may cause such Environmental pollution : the leaching of nitrogen cause surface and underground water pollution; nitrogen may cause nitrate enrichment. phosphorus with surface runoff cause eutrophication of surface water ; Phosphorus fertilizer may cause such environmental pollution: Phosphate fertilizer production process may cause fluoride pollution.

6. CONTENTS The species of wheat :Yangmai15 and Yangmai16 The concentration Process Measurement items

9. Process 2 sprouting : put seeds which have been disinfected in wet gauze, and leave them in electro-heating standing-temperature cultivator about 48 hours, the temperature is 25℃. 3 Culture of seedling: put the containers which contain seedlings in light room 4-5 days, contain the time and strength of illumination. 4 divert seedlings to different treatments, cultivate about 6-7 days 5 get the plants and do experiments to get results of measurement items 1 disinfect the wheat seeds

10. Measurement items Total content of N 、 P in overland part and underground part 1 The ratio of overland part and underground part’s fresh weight and dry weight 2 The characters of root system through root system scanner 3 The trans-membrane potential of roots 4

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