الوصف

1   Background
In the *1stcentury ,a major environmental issue all mankind confront is that along with the popularization of fertilizer and high temperature effects caused by industrial fuel ,the extracting speed of  nitrogen in the air by human-beings is twice than that before the industry revolution resulting in serious environmental problems such as global warming, acid rain ,water eutrophication and so on .Therefore, controlling  nitrogen cycle is regarded as one of *4 engineering challenges in the  *1st century all mankind confront by the National Academy of Engineering in the United States.
 According to the statistics of  International Fertilizer Industry Association, more than *0% of nitrogen go into atmosphere, surface water and groundwater through volatilization, runoff and leakage  before absorbed by crops ,forming the tridimensional pollution “from earth to air”!
 
 Leakage of the fertilizer into ground results in over contents of nitrate in underground water which drive the citizens drinking the water to suffer from gastrointestinal disorders and even cancer, flowing into rivers and lakes results in the eruption of lake blue algae and near-shore red tide. Besides, volatilization leads to acid rain and green house gas emission *1% of which is agricultural green house gas emission.
 
2 Invention of fertilizer nutrient loss-control technology
The scientists of Key Laboratory of Ion-Beam Bioengineering of Chinese Academy of Sciences, based on controlling the loss of fertilizer nutrient, put forward the new theory different from the coated fertilizer and slow/controlled-release fertilizer. It is a new kind of fertilizer enclosed by internal-molecular networks with 6 Chinese invention patent rights applied or got.
3 Chief introduction to fertilizer nutrient loss-control agent
Fertilizer nutrient loss-control agent, a kind of odorless, tasteless, innoxious solid powder, means the additive which can control fertilizer nutrient loss and improve fertilizer quality .In addition, it is the key to fertilizer loss-control technology. The scientists invent loss-control agent by modifying the natural materials in a physical and biological way as well as combining many kinds of materials accurately. In aqueous phase, loss-control fertilizer can self-assemble to form a complex three-dimensional micro-nano-scale interpenetrating network. Thus it can immesh and fix the fertilizer nutrient around the roots of crops by hydrogen bonds, van der Waals force and viscous force, so that it can dramatically decrease the nutrient loss and increase the utilization rate of fertilizer.
3.1  Technical requirements
 Conducting «fertilizer nutrient loss-control agent » Q/DYSW ******9 enterprise standard with the concrete indexes as follows:
index standard code（Ⅰ） standard code（Ⅱ）
Moisture content（%） ≤*5.0 ≤*0.0
Swelling ratio ≥3 ≥2
Apparent density（g/ml） 0.***0.*5 0.***0.*5
Loss-control ratio（%） ≥*0.0 ≥*0.0
3.2  Application  scope
     Loss-control agent can be widely applied to fertilizer enterprises and all kinds of granulation crafts such as rotary drum granulator, disc granulator, ammoniation granulator, tower granulator, extruding granulator and so on for its easy manufacturing techniques without having to transform the production line. Besides, after measured proportionally, loss-control agent can be appended to all kinds of compound fertilizer, BB fertilizer, and organic fertilizer producing efficient protecting environmental loss-control fertilizer.
3.3 Application effects:
1    Loss-control agent can control *0.2% of ammonium chloride, *1.3% of urea, *3.7% of ammonium phosphate, and *1.4% of potassium chloride when compounded with fertilizer. The loss-control ratio of nitrogen, phosphorus and potassium in compound fertilizer  reaches  *7.3%ã€ï¿½*4.6% and  *3.8% respectively. The experiments show that there is  *7.8% reduction of the total nitrogen content in run-off water, *0% reduction of the total nitrogen content in leaching water ,  *7% **2% reduction of ammonia in volatilization and  3%~9% reduction  of  nitric oxide.
2   In aqueous phase, loss-control fertilizer can self-assemble to form a complex three-dimensional micro-nano-scale interpenetrating network. Thus it can immesh and fix fertilizer nutrient around the roots of crops by hydrogen bonds, van der Waals force and viscous force enlarging the spatial scale and decreasing the migration rate and volatilization rate of fertilizer nutrient inside the soil, so that it can dramatically decrease the nutrient loss and increase the utilization rate of fertilizer.
And over the 4 years , lots of provincial Agri-technique extension stations , soil and fertilizer stations ,CAS system , large and medium fertilizer enterprises and farms have been continuously authorized to conduct demonstration field-experiments  on wheat, rice, corn, cotton, vegetable and so on. A great number of true scientific statistics have been achieved through **7 experiment plots,**9 demonstration plots and a few million mu of demonstration field-lands.
Crop production fails to decrease at the *0%**0% reduction of loss-control fertilizer and the production of corn, vegetable of short growing season increases by 5% **0% in comparison with common fertilizer. According to analysis of the soil after the growing season, the nitrogen retention rate of loss-control fertilizer is *1% higher than that of common fertilizer. Crop production that used loss-control fertilizer increases over *0% more than that only used common fertilizer in the growing areas at equal fertilizer nutrient.
The new-type protecting environmental loss-control fertilizer agent has the advantages of controlling nutrient, saving fertilizer, enhancing efficiency, saving labor and protecting environment over common fertilizer.