Current nitrogen utilization rate of the treatment with high efficiency urea was increased by 28 3%～31 8% and the increase of residual N in soil ranged from 5 3% to 12 0% which resulted in the decrease of the loss of fertilizer N by 17 0%～19 3% Yield of rice applied with high efficiency urea was increased by 27 0%～29 3% compared with that of rice applied with common urea of equal N content.

Compared with CK,the seed cotton yield and fertilizer use efficiency of each treatment were as follow:(1) equal N(N 150 kg·hm~(-2)) used as base fertilizer increased seed cotton yield and N use efficiency by 10.3% and 10.2 %,respectively;

(2) equal N(N 150 kg·hm~(-2))used as base fertilizer and topdressing treatment(1∶1) increased seed cotton yield and N use efficiency by(22.5%) and 22.4%,respectively;

N recovery of rice controlled release N fertilizer with 90 kgN/hm 2 treatment reaches 72.6%～86.9%,and is higher by 41.7% on the average than that of urea treatment with 90kgN/hm 2.Early rice dry matter production amount per day is higher than that of urea treatment of equal N amount,too.

The Yield of rice by controlled-release N fertilizer application (90 kgN/ha) was 4.9%-16.4% higher than the urea treatment of equal N amount, was 13.8%-60.9% higher than no N plot among different basic soil fertility level.

2. Among the three treatments with equal N application, the treatments of [60%(NH4)2SO4+40%NH4C1] and NHtCl would reduce nitrate content in economical yield part of the same vegetable obviously compared to the treatment of Urea.

Based on the multimode squeezed state theory,the properties of equal N th power Y Squeezing of the state |Ψ (4) e,Ⅲ> q is studied ,and it is found that:1) When N=4m(m=1,2,3...)

Based on the multimode squeezed state theory,the properties of equal N th power H squeezing of state |ψ (4) o,Ⅲ> q is studied,and it is found that:1)when qN=4m(m=1,2,3,...,...)

Net benefit is increased by 763.35 Yuan/hm 2 on the average than that of urea treatment of equal N amount, and is increased by 137.36 Yuan/hm 2 on the average than that of urea treatment of multiple N amount.

Yield of controlled release N fertilizer application(with 90 kgN/hm 2)increases by 9.6%, 8.0%, 5.6% than that of urea treatment of equal N amount, and increases by 74.5%, 70.8%,49.5% than that of no N plot respectively. N absorption at rice medium and later stages is promoted after controlled release N fertilizer application.

It is pointed out how N' may be assumed without loss of generality to equal N.

However, fermentation of blood is superior to cooking because FDBM supported a higher performance than CDBM when they supplied equal N levels especially at higher levels of N supply.

In barley there was no significant yield difference between the NPK treatment and MBM treatment with equal N supply, and both had significant higher yield than the treatment receiving the same amount of mineral N without P-supply.

At low temperatures superthermal or high frequency phonons, which have temperature-independent and equal N- and U-relaxation rates, play important roles in thermal conduction in pure insulators.

There was no difference in the allosteric activitation of the NaK-ATPase in both animal groups as indicated by equal "n" values.

The palatability of creeping type A.adsurgens pail,during its breeding period is higher than that of A.adsurgen Cv..This is due to that creeping type A.adsurgen Pall.has shorter and rarer epidermal hair, relatively developed cuticle mechanical tissue and vascular tissue,richer leaf content and poorer fibre con- tent than that of A.adsurgens Cv.under the condition of nearly equal N—free extract content of two type A.adsurgens.

Rice seedlings were cultured in a deionized water solution to investigate the effects of NO_2~-on their growth and development. Fresh wight, dry weighy and N content of the seedlings increased with NO_2~-concentrations in the range of 0—60 ppm. The three parameters decreased with NO_2~- in the range of 60—100 ppm, but the decrease was slowed down in the presence of Fe~(++). Given equal N rates, dry weight, plant height, tiller number and N content of the seedlings were lower with NO_2~- as...

Rice seedlings were cultured in a deionized water solution to investigate the effects of NO_2~-on their growth and development. Fresh wight, dry weighy and N content of the seedlings increased with NO_2~-concentrations in the range of 0—60 ppm. The three parameters decreased with NO_2~- in the range of 60—100 ppm, but the decrease was slowed down in the presence of Fe~(++). Given equal N rates, dry weight, plant height, tiller number and N content of the seedlings were lower with NO_2~- as N source than with NH_4~+-N or NO_3~--N. Respiratory intensity and water content of the seedlings declined with the rise in NO_2~- concentration. NO_2(56 ppm) raised nitrite reductase activity, but had little effect on nitrate reductase activity.

The results of two-year experiments of no-tillage rice cultivation with differ- ent dosages of nitrogen fertilizers showed that the numbers of effective panicles in N applica- tion plots were 15.38%～48.52% more high than those in CK plots and the dry weight of single plant as well as plant height increased with ascending application rate of nitrogen fer- tilizer.The ratio of N nutrient content in plant to total accumulated N absorption amount (on dry weight basis)from tillering stage to booting...

The results of two-year experiments of no-tillage rice cultivation with differ- ent dosages of nitrogen fertilizers showed that the numbers of effective panicles in N applica- tion plots were 15.38%～48.52% more high than those in CK plots and the dry weight of single plant as well as plant height increased with ascending application rate of nitrogen fer- tilizer.The ratio of N nutrient content in plant to total accumulated N absorption amount (on dry weight basis)from tillering stage to booting stage was 63.9% in CK plots and 65.75%～80.14% in N fertilizer application plots.The ratio of N content in grains to total N absorption amount was 67.42% in CK plots and 60.51%～66.37% in N fertilizer applica- tion plots and decreased with ascending application rate of nitrogen fertilizer.The ratio of amount of N absorbed by rice plant from chemical fertilizer to total N absorption amount was 10. 81%～32.49% in different N fertilizer application plots.The average yield in CK plots was 74.62%～84.35% of that in N fertilizer application plots.The regression equation of N fertilizer dosage was obtained as follows.Y=5346.75+18.588 24X-0.04752X~2.The func- tion of fertilizer efficiency was calculated using this equation and the optimum economic dosage of ammonium carbonate in rice fields was fixed at 984 kg/ha.According to the Dun- cun's new multiple range test,the productivity of chemical fertilizer used at an equal N dosage but with different application techniques differed significantly between treatment 1(3 top applications),treatment 2(one application of basic fertilizer,two top applications)or treatment 3(4 top applications)and treatment 4(1 application of basic fertilizer),and non- significantly among the treatment 1,2 and3.