The nitrate content had been increased with the time flying under the same well from 1991 to 1997.There were 117 households were surveyed in the area of double harvest rice. The inquired results stated that the nitrogen fertilizer application was 436.3-594.3kg/hm2,and the yield was 6273.1-9278.2 kg/hm2,and the efficiency of nitrogen fertilizer was 28.76%-32.09%.
The results showed that,compared to the conventional cultivation method(without any mulching methods),plastic mulching and straw mulching significantly increased the water content in soil depth of 0～5,5～10 and 10～20 cm; however,the application of nitrogen fertilizer decreased the water contents in the above soil depth.
The content of rapidly available nitrogen fertilizer in soil is improved by a big margin by applying N fertilizer, under the condition of applying the equal amount N, and it is averagely increased by 16 - 25 percent by applying urea than ammonium bicarbonate.
The nitrate content had been increased with the time flying under the same well from 1991 to 1997.There were 117 households were surveyed in the area of double harvest rice. The inquired results stated that the nitrogen fertilizer application was 436.3-594.3kg/hm2,and the yield was 6273.1-9278.2 kg/hm2,and the efficiency of nitrogen fertilizer was 28.76%-32.09%.
Seizing the Opportunity,Inspiring Enthusiasm,Forging Ahead to Fight for Entrance with Rapid Strides of Medium Nitrogenous Fertilizer Plants into the 21st Century:Basic Thinking on Revamping of Medium Nitrogenous Fertilizer Plants
The experimental results demonstrated: the major form of transformation and movement from three varieties of N fertilizers in soils was NO3-N through 1 750ml/7times intermittent leaching and dry cycles in 25 days.
Results showed that the grain yield of rice with combining application of N, P, K or combination of chemical fertilizer and organic manure could maintain approximately 6 000 kg hm-2. N recovery (difference method) in the two treatments averaged from 42%~49%. As compared with those treatments of lacking a certain element, its grain yield increased by 30%~40% and N recovery increased by 10%~20%.
研究结果表明:氮肥与磷、钾肥配合,化肥与有机肥配施两个处理的稻谷产量稳定在6000 kg hm-2左右,氮肥利用率(差减法)平均为42%～49%,比缺少某一元素处理,增加产量30%～40%,氮肥利用率提高10～20个百分点。
After two rotation cycles of these two crops, the apparent N recovery in crops averaged 36%, 20% and 14%, and its apparent loss rate 37%, 38% and 48% in the applied amount of 120, 240 and 360 kg hm-2of nitrogen, respectively.
经过冬小麦、夏玉米两个轮作周期后,当施氮量为120、240和360 kg hm-2时作物的氮肥利用率平均为36%、20%和14%,而相应的土壤残留率平均为27%、42%和38%,表观损失率平均为37%、38%和48%。
Meanwhile, the effects of some important regulating factors, such as the rainfall, N deposition by rainfall, temperature, tillage, nitrogen fertilizer and manure application on N2O emission during this period were analyzed.
A field experiment was conducted to study the response of individual leaf spectral reflectance to five levels of nitrogen fertilizer treatments in rice (Oriza sativa L.) plants.
Discriminant analysis of the molecular properties of 17 nitrogen mustard agents designed in this work determined the extent of dissimilarity among members of this group.
An advantage of DNB is that it is suitable for the separation of the basic compounds containing nitrogen atoms without a capped process because the spacer containing nitrogen atoms can shield the residual silanols from DNB.
The synthesis of high-nitrogen energetic material 3,3'-azobis (6-amino-1,2,4,5-tetrazine) (DAAT) from 3,6-bis (3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine by a four-step reaction is described.
Wine-growing is one of the intensive cultures using extremely high doses of nitrogenous fertilizer, the washing out of which can have its influence on the quality of drinking water.
The size and activity of the chemolithotrophic bacterial community were studied in an integrated farming system, with increased inputs of organic manure and reduced inputs of mineral nitrogenous fertilizer, versus conventional farming.
The method applies to the standard arithmetic subgroups ofSO(n,1) (a case which was proved previously by Millson [Mi]), to the non-arithmetic lattices inSO(n,1) constructed by Gromov and Piatetski-Shapiro [GPS] and to groups generated by reflections.
We express them in terms of generatorsEij ofU(gl(n)) and as differential operators on the space of matrices These expressions are a direct generalization of the classical Capelli identities.
In this paper, we prove the degenerations of Schubert varieties in a minusculeG/P, as well as the class of Kempf varieties in the flag varietySL(n)/B, to (normal) toric varieties.
氮肥
nitrogen fertilizer 
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