第1个回答 2013-12-05
Through field test, the combination of different water and nitrogen to mild salinization area on Photosynthetic Characteristics of maize and its relationship with yield, water and nitrogen ratio to seek suitable for planting in the region to improve the yield of corn, and prevention of secondary salinization crop purpose. 10 kinds of water and nitrogen treatments in the mild salinity soil, leaf on Photosynthetic Characteristics and yield of maize were studied. The results show that: in the mild saline soil, saving water and nitrogen would not moderate decrease Maize Photosynthetic rate and leaf WUE, no significant effect on yield. When the irrigation amount reached 2250 m3/hm2, nitrogen application is 225kg/ Hm2, the photosynthesis, leaf WUE and yield increased significantly, continue to increase irrigation and nitrogen Maize Photosynthetic rate, leaf WUE and yield was not increased significantly. Path analysis showed that mild salinity soil, irrigation water is Maize Photosynthetic rate, stomatal factors is non stomatal factors or common constraints a major factor. Comprehensive analysis, water and nitrogen treatment T5 than the local level of water saving 30% n 30.8%, photosynthetic rate and leaf WUE were higher than that of T9 4.83% and 3.76%, no differences in yield, water and nitrogen ratio is mild salinity soil maize planting more reasonable. Results can provide a reference for the similar area irrigation and fertilizer and water management.