Effects Of Different Nitrogen Fertilizer On Growth And Physiological Characteristic Of Maize Roots

At present, domestic and abroad has been a lot of research on super high-yield maize. Most of the research has focused on the study of the physiological and biochemical characteristics of the aerial parts of maize leaves. Maize root research has been reported rarely reported. In this experiment, the compact super high-yield maize Xianyu335and Zhengdan958test materials. Study the impact of different nitrogen fertilizer on root physiological characteristics of the entire growth period of two maize varieties and production.Determine the best high-yield corn production of nitrogen fertilizer rates. Test on April26,2011sown crop research center in Jilin Agricultural University Experiment Station. Test using a randomized complete block design with three replications each cell line8, the district governor8m, spacing0.65m, residential area of41.6m2, District located between aisle1m, two lines on both sides of the block protection line. Fine soil preparation before planting, making the moisture. All organic fertilizer, phosphorus, potash as basal applied nitrogen fertilizer was applied to30%, the remaining70%, respectively, in the jointing stage and heading stage was applied (20%and50%), respectively, at the seedling stage, Characteristics of the activity determination of the vitality of the maize root, soluble protein and sugar, protective enzymes (superoxide dismutase (SOD), peroxidase (POD), over the catalase (CAT)) and MDA nitrate reductase, proline, free amino acid content. Determination of the yield of maize mature. The trial concluded as follows:1, the whole growth period, xianyu335and Zhengdan958root vitality were shown a single pea k curve, the maximum at jointing stage and the lowestaverage incidence. Different nitrogen fertilizer corn root activity is:no significant differences between the300kg/hm2>200kg/hm2>100kg/hm2>0kg/hm2>400kg/hm2. No significant differences between each growth period, and two high-yielding varie ties.2, Under different Treatments of Nitrogen Fertilizer Xianyu335and Zhengdan958nitrate reductas e activity, soluble protein, soluble sugar content showed a single peak curve. No significant differenc e in the two maize varieties.The maximum content of soluble protein in the grain filling stage, the maximum soluble sugar and nitrate reductase activity in the silking stage. Different on the three indic ators are in the processing of300kg/hm2,400kg/hm2were the lowest order:300kg/hm2>200kg/h m2>100kg/hm2>0kg/hm2>400kg/hm2.3, different Treatments of Nitrogen Fertilizer of high-yield maize Xianyu335and Zhengdan958Protective Enzyme Activities with the continuous advance of growth stages and increased at first and then decreased, showing a single peak curve, which, superoxide dismutase (SOD) in the grain filling stagemaximum of peroxidase (POD) and hydrogen peroxide, catalase (CAT) at the silking stage, the maximum value. Treatment of different nitrogen fertilizers, superoxide dismutase (SOD) and peroxida se (POD) by the impact of nitrogen fertilizer, root activity of the order are:300kg/hm2>200kg/hm2>100kg/hm2>0kg/hm2>400kg/hm2. Peroxidase (POD) activity of roots:200kg/hm2>300kg/hm2>100kg/hm2>0kg/hm2>400kg/hm2。two maize varieties were no significant differences. Malondialdehyde (MDA), on the contrary, with the growth stages increased, increased rapidly in the heading period, t wo Treatments of Nitrogen Fertilizer of maize root of malondialdehyde (MDA) in the order:400kg/hm2>0kg/hm2>100kg/hm2>300kg/hm2>200kg/hm2.4, Through different nitrogen proline content of the xianyu335and Zhengdan958root derived an alysis that Slow increase in proline content in the roots from the seedling stage, the slow increase in proline content in the roots from the large bell of the rapid increase in the slow changes in the mil k stage. From the large bell of the rapid increase, slow changes in the milk stage. Different Treatme nts of Nitrogen Fertilizer corn roots, the highest proline content in200kg/hm2. Different Treatments of Nitrogen Fertilizer after proline content in roots xianyu335and Zhengdan958order:200kg/hm2>300kg/hm2>100kg/hm2>0kg/hm2>400kg/hm2.5, Different Treatments of Nitrogen Fertilizer after the xianyu335and Zhengdan958two high-yiel d maize varieties root, free amino acids increased with the of Fertilizer level were increased with the increased amount of nitrogen fertilizer on maize, free amino acids in rootscontent increased, the resu lting increase in free amino acids in the cell material, delay aging, improve production, as nitrogen1evels continue to increase free amino acid content in maize roots but reduced the order of the best a dvantages of Different Treatments of Nitrogen Fertilizer application rate:200kg/hm2>300kg/hm2>100kg/hm2>0kg/hm2>400kg/hm2. Free amino acids in the maize growing period showed a single peak curve, the maximum in the grain filling stage, the grouting of the free amino acid content in the ro ots of two maize began to decline, indicating that, along with the advance of the growth period, the corn plant body nitrogen metabolism also will be strong, maize plants of inorganic nitrogen assimila tion product is also increased, the increase of free amino acids makes the composition of proteins, n ucleic acids, chlorophyll, and growth hormone in the maize roots indirect precursor synthesis are enh anced, and thus for the corn on the ground The section provides nutritional energy. 6, Different Treatments of Nitrogen Fertilizer Xianyu335and Zhengdan958root to shoot ratio a nd yield changes are as follows:300kg/hm2>200kg/hm2>100kg/hm2>0kg/hm2>400kg/hm2. Summe d up the changes of physiological and biochemical indicators of high-yielding maize root, to determin e the high-yield corn production best nitrogen fertilizer for the production of practice.