Studies On The Dynamic Change Of Nitrogen Of Soybean Plant And The Effect Of Additional Nitrogenous Fertilizer On It

Studies on the Dynamic Change of Nitrogen of Soybean Plant and the Effect of Additional Nitrogenous Fertilizer on itThis test went on in the experimental plot of the Northeast Agricultural University in 2002-2003, the soil was the black earth, the test selected high-oil cultivarDN47 material, set up four stages of additional fertilizer with light, shade and dark treatments, studied dry matter accumulation, dynamic change of nitrogen and effect of stage of additional fertilizer and light on dynamic of nitrogen and yield of soybean. The results are as follows:Character of dry matter accumulation of soybean plant: The dry matter in leaf, petiole, and stem accumulated fast from flouring flowering to filling, after filling dry matter concentrated on legume. The difference existed in the dynamic change of nitrogen among different positions of soybean plant. The total N content of soybean showed that the nitrogen content in leaf changed as a curve, while in petiole and stem decreased slowly and in legume changed as tall-low-tall tendency. The order of the ammonia nitrogen content was: stem>leaf>petiole, the ammonia nitrogen content in leaf changed as a curve, in stem and in petiole decreased first then increased. The N03-N content order: petiole>stem, the N03-N content in stem and in petiole decreased, in petiole the change breadth was large. The ureides content was higher in stem than in petiole and leaf obviously, on Stage R5 in legume had a high content, in stem the ureides content was lower- rise- lower tendency, in legume decreased fast, and changed as a curve in leaf and petiole, maximum being at flourishing fruiting stage, the allantoic acid content was higher than allantoin obviously.There was difference in daily changes of the nitrogen content of soybean plant. The ammonia nitrogen content in different positions changed as a smooth curve on Stage R2 (June 26), the content was high at 10-16 o' clock, the ammonia nitrogen content in different positions changed as a curve on Stage R5 (July 22), maximum being at 12 o' clock; maximum of the N03-N content in stem and petiole was at 10 o' clock on Stage R2 (June 26) and R5 (July 22), in petiole the change breadth was large. The dynamic change of the ureides content in every position was similar, the ureides content in stem decreased speedily on Stage R2 (June 26), and in petiole and leaf the content was higher at 10,14,16 o'clock, the ureides content in legume decreased then increased on Stage R5 (July 22), in leaf, petiole and stem the change wasn't dramatic.The effect of light on nitrogen nutrition of soybean plant was dramatic, the order of the ammonia nitrogen content in leaf at 8 a.m. was shade>light>dark, in stem was dark >shade >light, in petiole and apical heart didn't change obviously. The dynamic of ammonia nitrogen in leaf at 14 p.m. was contrary to 8 a.m., in stem and apical heart with shade treatment the ammonia nitrogen content was higher than light, in petiole was lower than light. The order of the N03-N content in stem and petiole at 8 o'clock a.m. was: shade>dark>light, there wasn't obvious change in legume, and in petiole at 14 o'clock was: light>hade>ark; the effect of light on ureides and allantoic acid content in legume and stem at 8 a.m. was the same as 14 p.m., the ureides content in leaf and in petiole changed inversely, the allantoic acid content in legume at 8 a.m. and 14 p.m. changed inversely, other positions was the same.The effect of different additional fertilizer treatments on nitrogen content of soybean was different. The N03-N content in stem and petiole on Stage R2 and in petiole on Stage R4 increased by Treatment B1 (additional fertilizer on earlier flowering stage), the N03-N content in petiole on flourishing fruiting stage increased by Treatment B2 (additional fertilizer on flourishing flowering stage). The ammonia nitrogen content in stem and petiole on flourishing flowering stage decreased by Treatment B1, but B1 promoted the ammonia nitrogen content of every position on Stage R4 and R5, B2 made the ammonia nit...