| In many kinds of nutrient elements that maize growth need, nitrogen is particularly important, it is the primary factor limit plant growth and the formation of the output. In actual production, the application of nitrogen fertilizer is mainly with urea and ammonium sulfate, the test by studying the different Nitrogen Form regulation of spring maize root, growth and development in northeast China, photosynthetic characteristics, soil enzyme activity and soil ammonium nitrogen and nitrate nitrogen content, nitrogen utilization efficiency of agriculture, and nitrogen partial productivity as well as the influence of the influence of yield and quality, etc, to explore the actual field production of nitrogen forms and proportion, understand the northeast spring maize response to the different nitrogen forms, analyses the reason of different processing make the yield of spring corn, to provide theoretical basis for rational fertilization way, to the actual agricultu ral production has an important guiding significance. The results are as follows:The root length, root surface area and root volume of A2 treatment are greater than any other parameters,compared with other treatments significant difference, that the ratio of fertilizer to some extent, meets the requirements of the growth of roots, rich nutrients, promote the adaptability of the root.At the same time, the treatment of corn seedling root activity is the best, the significant difference compared with A3, A5 treatment.The fresh plant height, leaf dry weight, stem fresh dry weight, stem diameter, stem length, leaf area and root-shoot ratio of every treatment were increased, but the A2 treatment effect is most obvious, and there was a significant difference with other treatment.Each treatment of SPAD in maize growth period, leaf photosynthetic rate, transpiration rate, stomatal conductance, change first increased and peaked tasseling stage, in addition to SPAD reach maximum in filling stage, the remaining indexes reach maximum in spinning stage. A2,A3 treatments’ all indexes were higher than others, and A2 got the highest value, A4, A5 treatments each index is lower than A1.Each treatment with soil urease, invertase and catalase content were higher than no fert ilizer processing, and reached the maximum in tasseling stage, urease and sucrase content in A2 processing is significantly higher than other treatment, but compared with the content of hydrogen peroxide enzyme A3 treatment difference.The processing various periods of soil ammonium nitrogen content were higher than no fertilizer controlled processing, using two kinds of nitrogen at the same time, can get a higher growth rate and yield, probably because of the use of two kinds of forms of nitrogen, plants are more likely to adjust intracellular PH and storage of nitrogen by a small amount of energy consumption.The processing of applying urea, agronomy efficiency is significantly higher than using ammonium nitrogen the processing of ammonium sulphate, so d ifferent treatment of spring maize yield can be attributed to the change of the utilization rate of fertilizer treatments on agriculture, at least in part due to the utilization ratio of agriculture to change; The treatment of applying urea is higher than using ammonium sulfate treatment of nitrogen partial productivity, instructions in production field, using the urea amide nitrogen can improve the nitrogen partial productivity of maize, which can increase the yield of crops.Different fertilizer treatments compared with no fertilizer trials at different levels of output, the urea process are higher than sulfate process and A2 treatment disposal the highest yield,increase 29.6%,A4 treatment increase 26.8%.A2,A3 processing quality is significantly higher than A1,A4,A5 treatments.. |
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