Ear number per unit area,dry matter accumulation amount after anthesis, leaf area index at heading stage and grain yield increased with the increase of nitrogen application amount when the basic seedling number was 90~180×104/ha,but those could decrease when the basic seedling number was over 270×104/ha.
Wanmai38, strong gluten wheat, was taken as an experimental material to study the effect of soil basic fertility and nitrogen application methods on grain yield and quality.
To get the highest yield, the nitrogen application methods of applying 238.6kg/hm2, and 35.1% of the topdressing in jointing in field one (lower soil fertility foundation), and the nitrogen application methods of applying 274.2 kg/hm2, and 47.2% the topdressing in jointing or in jointing and booting in field two (higher soil fertility foundation).
Experimental results for two years indicate that optimum nitrogen fertilizer application was 125.9 to 139.4 kg/hm2, optimum density 21.7 cluster/m2 for rice variety "Wuyou 1".
Nitrogen fertilizer application in R 1 could improve the yield and protein of seed. The absorption of nitrogen, phosphor(P 2O 5) and kalium(K 2O) for producing 100kg seed improved slightly within the range of 0-90 kg/hm2. The rate among nitrogen, phosphor and kalium was about 1∶0.28∶0.69 steadily. The uptake rate of kalium decreased if the application of nitrogen was increased any more.
The result indicated that the yield of garden sass increased at the nitrogen fertilizer application of 0-500 kg hm~(-2),but the yield decreased at 700 kg hm~(-2).
结果表明,在施氮肥0~500 kg hm-2范围内,氮肥施用量越大,产量越高,但到达一定量时,便不能再促进产量的提高,反而会引起减产。
Through research, the curvilinear equation,y=35.52 + 24. 8123x-0. 9012x2, describing the relationship between the amount of nitrogen applied and the yield has been obtained.
The results obtained were as follows: ① The rice yield ranked from high to low in different proportion of nitrogen treatment as follows 6:4,5:5,7:3,4:6 and 3 : 7. When the ratio of nitrogen applied at early stage to the total nitrogen was 58. 99%, yield was the highest;
(3) The ammonium nitrogen content of river water showed an accelerated increasing trend in the mainstream and the tributaries during 1980—1990—1999, which was caused by the increase of waste water discharge and nitrogenous fertilizer application in the Yellow River basin.
The analysis of the quality of the grains showed that nitrogenous fertilizer application had an obvious effect on increasing the protein of grains,wet gluten,the paste stabilization time,and the sedimentation coefficient. The optimum amount of pure nitrogenous fertilizer application in the district of Jiao Zuo was reached as 13.5～14.5kg/666.7m~2 by means of mathematical equation,with the increasing amount of nitrogenous fertilizer application,the agricultural,recovery and physical efficiency of the fertilizer decreased.
At the same water supply, the accumulation of nitrate in lm soil profile of field plot and column increased with higher nitrogenous fertilizer application.
First, yield of rice in sandy and clay soil was increased by nitrogen application, and that in clay soil was higher than that in sandy soil, but the effect of nitrogen on yield increment was greater in sandy soil than in clay soil.
However, in clay soil, ANRE was increased with the increasing of nitrogen application at first, and reached the highest value at medium nitrogen level, then decreased dramatically at high nitrogen level.
Using the pot experiment and closed static chamber-gas chromatography (GC) technique, this paper studied the effects of nitrogen application (150 and 300 mg/kg soil) and maize growth on N2O emission from soil.
Nitrogen fertilizer application enhanced yield of both crops by an average of 1.15 Mg ha-1 in the 1994 season, but did not increase yield in the dry 1995 season.
Nitrogen fertilizer application of 150 and 300 kg N ha-1 at the 1st node stage of wheat increased grain yields compared with preplant N fertilizer applications.
Measurements have been made on the thermal conductivity and specific heat of the powder product from quenching in nitrogen applied to the gas-liquid flame formed by the combustion of a tetrazole-sodium tetrazolate mixture in weight proportion 3∶1.
Ammonia volatilization losses measured from soils at seven sites in the Serengeti National Park, Tanzania during the 1986 growing season ranged from 2.78±0.49% to 25.03±1.34% of nitrogen applied.
氮肥施用
nitrogen application
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