Polyaspartic Acid On Migration Studies On The Effect Of Urea Nitrogen In The Soil

Nitrogenous fertilizer is one of the most important fertilizers not only in developed countries but also in developing countries.In nearly 20 years,the medical fertilizer all the countries in the word used increased 3 times,in 1990,that arrived 171 million ton.Especially nitrogenous fertilizer increased faster,which exceeded 70 million ton.Although the fertilizer using quantity and output of the crops were increased,lacking the scientifical ways to guide,a lot of fertilizers wasted and went into the water through sueface water,groundwater or ersion of water and soil,which not only poluted water and the environment of it, but also destroyde the balance of the ecosystem. Absurd using fertilizer for a long time changed the physical character of the soil,reduced the fertility of the soil and fertilizer,which added the using quantity of the fertilizer.Doing this not only increased the agricultural cost,but also polluted the enviroment of water, soil, air and agricultural.Such as excessive using nitrogenous fertilizer will make the nitrogen conversion in the soil and become the quantity increment of the nitrate, which will increase the content of soil,water body,food and the nitrate in the vegetable.Our country uses the most quantity nitrogenous fertilizer in the word that arreved 26 million ton pure nitrogen in 1999,occupide 30% or so of the word(the Chinese agriculture statistics ,1999).For several decades, nitrogenous fertilizer in our country agriculture acted the most important role as in other countries.But unreasonable using nitrogenous fertilizer also binged a lot of questions.In many regions of our country,excessive using nitrogenous fertilizer is very serious.Under this background condition the experiment is launched.Though the international communities all try to resolve the absurdity of the nitrogen fertilizer and the problem of the dosage,the world main developed counties have alreay obtained some results, in developing country especially in China, his unreasonable ways exist in many regions.The sientists who are good at agriculture combine domestic and international experience and gradually master the right ways of using fertilizer to keep with the national status of China,including traditional methods which contain lots ofvillige experience and the latest domestic and international ways of the fertilizers which are added the inhibitor.This text mainly studied the low utilization of the fertilizer,the reason of the fertilizer lose and its damage Above this to studied how to improve the utilization of the fertilizer,including the traditional and the latestet sientific methods at home and abroad.The traditional methods pay attention to the change of the fertilizer outside which is improved in using methods.But the new morden scientific methods concentrated the attention to fertilizers themselves, which is added inhibitor in the fertilizers to reduce the releasing speed of the fertilizer.That can be absorbed the most quantity by the crops which reduce the quantity of the fertilizer following evaporation and lose with water and soil erosion,with this purpose that attains to raise its utilization.The mothed gets good effect at home and abroad and proved by relevant experiments.The fertilizer that the experiment used is a new kind of fertilizer(the factory named it "lv feng yuan" fertilizer that can increase the effect of the fertilizer).But the principle of the fertilizer to increase the effect is different from other fertilizers,and the biggest differentiation lies in the different inhibitor. The fertilizer that the experiment used is added a new kind of inhibitor-PASP.It is the product of beijing ai shi hua science and technology limited company that owns patent right of the product.The experiment was divided into two parts-indoor and outdoor.The migration diffuseness of indoor experiment was used nine soil troughs to complete.The length of the soil through is lm,the breadth is 0.2m and the height is 0.2m too.The experiment had blank, common carbamide and the new kind fertilizer that had the beginning amount of water were 30%, 50% , 70%,repeating three times.Each soil trough had separate and one-off to sampling,and each sampling had fives,total 90 samples.Seepage experiment was used 27 soil pillars to complete.This experiment still had blank, common carbamide and the new kind fertilizer that had the beginning amount of water were 30% , 50% , 70%,and the height of the water of the soil pillarshad 1cm , 3cm, 5cm.repeating three times,27 samples.The standard of outdoor experiment was the same as the indoor's.The area of the each experimental land was 4*4m~2,the breadth of the insulation was 1m that was insulated by waterproof flim.The main conclusions of the text are:1.Under the certain water and fertilizer applied,both horizontal and lengthways parts of inoor experiment,the new kind of ferltilizer that had the same amount of water of the soil trough and the same height of water of the soil pilliars released the concentration of nitrate and ammonia is smaller than the common carbamide in the same distance and the same time.Under the different height of water,common carbamide was influenced strongly by it,but reverse of the new kind of fertilizer.2.Because of the influcece of the soil condition\water condition and the surrounding environment,the concentration of the nitrate and ammonia don not change obviously between indoor and ourdoor experiments.But through themselves we can still get the same conclusion as indoors.3.Through the indoor and outdoor experiment wo can get that under the same amount of fertilizer,common carbamide releases more amount of nitrate and ammonia of fertilizer that may be losed through evaporation or following with the loss of water and soil.This part is not absorded by crops.Above all,the new kind fertilizer is superior to the common carbamide.Because the ion releasing speed of the new kind fertilizer is slower than the common carbamide,and the effect is longer.The new kind fertilizer is not only increase the output of the crop but also reduce the pollution to the soil environment,water environment,the atmosphere environment and the surroundings environment. Particularly to our country now faces excessive using amount of fertilzer and serious pollution,the success of the new kind of fertilizer brings us and other countries a good fertilizer that can be good for economic, society and environment.This text both can provide theory basis on the agriculture and using fertilizer of our country and provede reference to other documents.So it has important value.