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Corn (Zea mays), is an important food crop in northern China, and the abundance of its production due to a direct impact on farmers' income and the building of a harmonious society. How to ensure the normal agricultural production, protect food production improved steadily become the problems to be solved. Support of the national project of the Ministry of Science and Technology of Food Production Technology Engineering major research groups in the quality of its source library metabolism in high-yielding irrigated summer corn under different fertilization and on this basis, to establish simplified, supporting high-yield, high efficiency The summer corn fertilization methods, in order to achieve efficiency savings this, the farmers' income to provide a theoretical basis and technical support. Experimental field trial in the town of Henan Province, Wenxian clouds, soil for soil loamy tide. To summer maize hybrids Zhengdan 958 for materials, four kinds of different fertilization [seed furrow fertilization (T1) and the seed furrow fertilization small opening period to recover nitrogen (T2), seed furrow fertilizer nitrogen jointing stage large bell of Nitrogen (T3), controlled-release fertilizer (T4)] of summer corn population quality traits, the source library metabolic activity, grouting process material metabolism and tolerance to the ability, the main results are as follows: crop the level of economic output, by biological yield, the dry matter accumulation. The size of the leaf area between the strength of the photosynthetic capacity, affect the production capacity of its dry matter, thereby affecting the grain yield. The results of this study show that different fertilization corn leaf area index, shoot dry weight, plant height, ear height, stem diameter, have varying degrees of improvement, and T3 treatments (seed furrow fertilization jointing stage of Nitrogen large bell of Nitrogen) the effect of the most significant, followed by T4 treatment (release fertilizer), the need to improve late photosynthetic capacity to increase production, that is, to maintain the appropriate late leaf area index and shoot dry weight. The test results show that the corn leaf chlorophyll content size: T3 gt; T4 gt; T2 gt; T1 gt; of CK, Fv / Fm, ΦPSII, qP, photosynthetic rate and stomatal conductance also showed a consistent variation. T3 treatment jointing stage (seed furrow fertilization of Nitrogen bell stage of Nitrogen) compared with other treatment is more conducive to the chlorophyll content and PS Ⅱ potential activity of PS Ⅱ photochemical efficiency, thereby reducing the solar energy heat dissipation, so that leaves the absorption of light energy is more fully used for photosynthesis. The SPS activity leaves the size of the order: T3 gt; T4 gt; T2 gt; T1 gt; CK, indicating T3 treatments (seed furrow fertilization jointing of Nitrogen large bell of Nitrogen), fertilization is more conducive to the leaf sucrose accumulation, increase assimilate supply capacity of the source, and laid the foundation for the high yield. Crops soluble sugar content on behalf of the body carbohydrate synthesis, conversion and output metabolism. After sowing 45 ~ 65d, soluble sugar content of each treatment was significantly lower than the control, while the 75 ~ 95d after sowing contrary. The same growth stage, compared with other fertilizer treatments, T3 treatment (seed furrow fertilization jointing stage of Nitrogen bell stage of Nitrogen) showed a significant advantage, illustrate this fertilization is most conducive to the accumulation of soluble sugar in the early growth stage of corn late transfer to the grain. Grain SS activity and AI activity variation between the different treatment of the entire growth period are T3 treatment (seed furrow fertilization jointing stage of Nitrogen large bell of Nitrogen) is relatively high, followed by T4 treatment (release fertilizer), indicating both fertilization methods more conducive to the decomposition of sucrose transported from the leaves to the grain, to accelerate the accumulation of starch, and is conducive to the growth and development of the grain. Change the test grain dry matter accumulation, the maximum speed of dry matter accumulation after pollination 15 to 25d is a critical period of dry matter accumulation and yield formation. Maize grain in the completion of the process, its volume, dry weight showed a rapid increasing trend. The results of this study show that the the T3 process (seed furrow fertilization jointing stage of Nitrogen bell stage chasing nitrogen) compared to other fertilizer treatments more conducive to corn grain dry matter accumulation. 5 ~ 35d after pollination, grain soluble sugar and starch content increasing trend downward trend to increase rapidly, sucrose content and protein content, and starch content of 5 ~ 15d, and 5 ~ 15d sucrose content decreased rapidly. SOD is the first line of defense, plays a particularly important role in the active oxygen scavenging system, affecting plants O2-scavenging reactive oxygen plants. And the concentration of H202. The level of MDA content in the ability to repair itself to some extent reflect the level of membrane lipid peroxidation and its plants. The test results show that the T3 and T4 treatment leaves SOD activity, MDA content and relative conductivity lower seed furrow fertilization jointing stage to Nitrogen Nitrogen Application bell stage \more conducive to enhanced mesophyll cells of reactive oxygen species scavenging, effective control of membrane lipid peroxidation levels, improve maize tolerance to the ability to lay the foundation for the high-yielding. The test results of this study show that the fertilization treatments, rows per ear, kernels per row, compared to grain weight and yield of the control reached significant levels. Each treatment, the T3 treatment rows per ear, kernels per row and yield are significantly higher than T1, T2 and T4 treatment T4 processing grain weight was significantly higher than T1, T2 and T3 treatment. Production level of each treatment as follows: T3 gt; T4 gt; T2 gt; T1 gt; CK T3 treatment was significantly higher than other treatments, compared with CK yield of 44.61%, compared with T1 yield 25.65%, compared with T2 yield of 23.16% 20.16% increase over the T4. In summary, four different fertilization methods [seed furrow fertilization (T1), seed furrow to fertilization small bell stage chasing nitrogen (T2), the seed furrow fertilization jointing stage nitrogen chasing large bell stage the nitrogen (T3), controlled-release fertilizer (T4)] of summer corn above traits in varying degrees of improvement, T3 treatment conducive to increase shoot dry weight, leaf area index, plant height and ear height, so that groups of summer corn quality traits significantly improved ; T3 treatment there is conducive to improve the chlorophyll content, PS Ⅱ primary photochemical efficiency (Fv / Fm), PS Ⅱ quantum efficiency (ΦPS Ⅱ) and photochemical quenching coefficient (qP), reduce non-photochemical quenching coefficient (NPQ), to improve the photosynthetic rate and stomatal conductance, lower leaf transpiration rate, so summer corn remains strong photosynthetic capacity; T3 treatment not only improve nitrate reductase and sucrose phosphate synthetase activity, and can improve the sucrose synthase and acid invertase activity; T3 treatment help to improve the volume of maize grain, dry weight, filling rate and grain soluble sugar, sucrose, starch and protein content, increased the Sink carbohydrate accumulation capacity, laid the foundation for high-yielding; T3 treatment and T4 processing of corn leaf SOD activity and lower MDA content and relative conductivity better, is conducive to the delayed leaf senescence; T4 treatment to improve the effect of corn grain to grain weight larger, T3 most conducive to increase corn production. It is recommended in accordance with the T3 treatment (with the planting of the opening of Summer into DAP 300 kg.hm-2, KCl300 kg.hm-2, jointing stage urea 300 kg.hm-2, 450 kg of urea topdressing large bell stage . hm-2) fertilization.
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