Effect Of Amino Acid Synergist On Transformation Of Urea In Different Soils And Growth Of Rice Seedling

The utilization rate of nitrogen fertilizer in China is only 30%-40%.Urea is the most widely used and most abundant nitrogen fertilizer in China’s agricultural production.The utilization rate of nitrogen fertilizer is low,which not only causes waste of resources,but also causes acidification of soil and water pollution.Seriously endangering agro-ecosystems.Amino acids have been widely used as fertilizer synergists in the field of fertilizer production.In recent years,it has been widely used as a fertilizer synergist in the field of fertilizer production.In this study,effects of amino acid synergist on the transformation of urea in four different soils(yellow cinnamon soil,red soil,fluvo-aquic soil and gray desert soil)were investigated by using soil culture experiment.And a rice pot experiment was conducted to explore the effect of amino acid synergist addition on the growth and development of rice seedling.The synergistic effect of amino acids on soil nutrients and its preliminary synergistic mechanism were explored.The following results were obtained:1.There is a significant difference in the decomposition and conversion of amino acid-enhanced urea in different soils,but the effect of adding amino acid synergists in the same soil is not obvious.In terms of nitrogen conversion,nitrate content was significantly different in different soils.The peak content of nitrate nitrogen in tidal soil was 508.35 mg/kg,which was about 6 times of the peak content of yellow cinnamon soil(83.51 mg/kg).Red soil and gray desert The conversion of nitrate nitrogen in soil is about 3-5d later than that of yellow cinnamon soil and fluvo-aquic soil.The effect of soil properties on urea conversion is more prominent at existing levels of addition.2.The decomposition and transformation of amino acid synergistic urea showed a significant difference in different soils,while the effect of amino acid synergist addition in the same soil was not obvious.In terms of nitrogen conversion,the nitrate content was significantly different in different soils.The peak content of nitrate nitrogen in fluvo-aquic soil was 508.35 mg/kg,which was 6 times of the peak content of yellow cinnamon soil(83.51 mg/kg).The conversion of upper nitrate nitrogen in red soil and gray desert soil was about 3-5 days later than that in yellow cinnamon soil and fluvo-aquic soil.At the existing level of addition,the effect of soil properties on urea conversion was more pronounced than that of amino acid synergists.3.Application of amino acid synergist can significantly promote the growth of rice seedlings.The synergistic effect was mainly caused by the increase of plant height and aboveground biomass of rice seedlings in the early stage.Compared with the single application of urea,the increase of aboveground biomass was 7.58%、8.92%and 10.29%,respectively;chlorophyll content(SPAD)increased significantly,and the culture was more obvious at the later stage.The SPAD values increased by 3.51%and 5.58%at 17 and 27 days after transplanting,respectively.The root morphological indicators indicated that the addition of amino acid synergist increased the total root length and root surface area of rice.The number of root tips and the number of branches promoted root growth;the dry weight of shoots and the cumulative uptake of NPK increased significantly with the extension of transplanting time.4.On the whole,the contents of total nitrogen,available phosphorus and available potassium in rhizosphere and non-rhizosphere soils decreased with the extension of transplanting time;the combination of amino acid synergist and urea could significantly increase the nitrogen content in rice rhizosphere soil;The potassium content of the rhizosphere soil is lower than that of the non-rhizosphere.