Effects Of Urease/Nitrification Inhibitor Application On Growth Of Rape And Nitrogen Control

With the rapid development of national economy, more and more people begin to payattention to food safety and environmental issues.Nitrogen is one of the necessaryelements during the growth and development of the corps, therefore using nitrogenfertilizer is the most effective way for the corps to grow normally as well asimproving the output. However, in recent years, over-commiting the fertilizer and theunreasonable management lead to the massive loss of nitrogen. Thus we are alsofacing the problems such as pollution of the environment because of the over-usedfertilizer, the reduction of the output and the quality of the corps. To solve theproblems, more and more scholars start to put their effort on biochemical inhibitors sothat the migration and transformation of nitrogen would be in accordance with theneed of the corps.The method this article adopts is the combination of indoor simulation test and apot experiment. First, it discusses the effects of ammonia release of normal urea andurea that adds urease-inhibitor and nitrification inhibitor. Then in the experimentprocess, combine the urea and two kinds of urease-inhibitor and nitrification inhibitorDCD together, add the additive in, then composite bonding them with the binder.After that, compare the results of the finished fertilizer. A further effort is made to testthe effects on the output, quality of rape and the remaining nitrogen in the earth underdifferent finished fertilizer of different concentration of borid acid and DCD.The conclusions are as follow:1, Nitrification inhibitor DCD would not affect the activity of urease. Both ureaseinhibitor HQ and boric acid can delay the peak of ammonia release for one day andslow down the release curve.2, Both urease inhibitor and nitrification inhibitor can affect the output of the rape.The output rate increases9.77%—30.33%, compare to using normalurea. Synergistic effect would appear if the two inhibitors are used at the same time,and the output of the rape accord with the law of diminishing marginal returns. Theoutput would reach the highest point499g when the concentration of boric acid is6.33%, and the DCD is8.63%.3, Compared to normal urea, fertilizer with inhibitor in it can reduce the nitratecontent in rape significantly, which reaches to11.06%—35.70%. The interaction of boric acid and DCD can lower the content of nitrate, when the concentration of boricacid is4.01%, and DCD is6.68%, the content of nitrate in rape would be at the lowestpoint which is682.52mg/kg, and this is considerably lower the national standards,which means it is good to eat in any way except for serving raw.4, the nitrogen use efficiency (RE) of treatment added with inhibitors grows by3.03%—30.99%compared to using the normal urea. Though the rising ofconcentration for both urease inhibitor and nitrification inhibitor would enhance theRE for rape, however boric acid has a more significant result. Towards the agronomicbenefits of nitrogen AE, again, both urease inhibitor and nitrification inhibitor wouldaffect it in a obvious way, and it accord with the law of diminishing marginal returns.5, The content of ammonium nitrogen in Common urea soil treatment is the highest,6.88mg/kg. There was no significant difference between urease inhibitorhydroquinone and boric acid, they both inhibitate the concentration of ammoniumnitrogen in the soil during the process of Slowing urea release. The significant waseffect When the concentration of boric acid reached more than5%.6, Either urease inhibitor or nitrification inhibitor alone can decrease the quantity ofnitrate nitrogen in earth, but only when the nitrification inhibitor be added, thequantity of nitrate nitrogen is significantly reduced. That states DCD has a betterinhibition effect on nitrate nitrogen.7, The VC in slow-release fertilizer increased by13.93%—121.74%then the normalurea one. And most of the experiments receive a great increase in resul（tP<0.05）. TheVC in rape is mainly affected by urease inhibitor. The envelope itself can put off theurea’s rate of hydrolysis, and receive a similar result with urease inhibitor.8, There is no sharp relationship between the content of Chlorophyll in rape andnitrification inhibitor. Except for No.4using DCD alone, other results get an increaseby7.53%—16.53%, reach an considerable level(P<0.05). This law is the same withthe VC content law, and probably because the content of Chlorophyll can affect thedegree of photosynthesis which lead to the change of VC in rape and finally affect thequality of rape.Using Urease/Nitrification Inhibitor in a reasonable Consumption, not noly increasethe yield of rape, guarantee the quality of rape, but also improve N use efficiency,reduce soil N residue, reduce environmental pollution. It has great prospects inagricultural production practice.