Does Bidens pilosa L. Affect Carbon and Nitrogen Contents, Enzymatic Activities, and Bacterial Communities in Soil Treated with Different Forms of Nitrogen Deposition?
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The deposition of nitrogen in soil may be influenced by the presence of different nitrogen components, which may affect the accessibility of soil nitrogen and invasive plant-soil microbe interactions. This, in turn, may alter the success of invasive plants. This study aimed to clarify the influences of the invasive plantKeywords:
Deposition
Soil carbon
Partial pressure
Vacuum induction melting
Nitrogen gas
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Nitrogen accumulation reached the peak around 45 days after silking stage and high population was helpful to nitrogen accumulation.Total N content of the plant was positively correlated with yield and it got closer in higher density.Grain nitrogen content and nitrogen harvest index were significantly positively correlated with yield in higher density.Nitrogen application high ratio in silking stage was beneficial to N accumulation in leaf and ear,as well nitrogen translocation in stem and sheath,nitrogen application high ratio in earlier stage delayed nitrogen metabolism.Nitrogen uptake peak was from silking stage to 15 days after silking stage,nitrogen uptake rate increased in later growth stages under nitrogen application high ratio in silking stage and moved forward in higher population.It was advantaged for nitrogen fertilizer efficiency on condition that nitrogen application was moved backward.Accumulating too much nitrogen in earlier stages had inhibition on nitrogen uptake in later periods.
Nitrogen deficiency
Nitrogen Cycle
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In order to develop the high nitrogen efficiency Catalpa bungei C.A.Mey clones,an experiment was carried out to observe nitrogen distribution characteristics and nitrogen efficiency of ten Catalpa bungei C.A.Mey clones treated with the high(+N) and low(-N) nitrogen.The results showed that more nitrogen distributed to the underground part(rootleafstem) under the low nitrogen treatment,while situations under the high nitrogen treatment was contrary(leafstemroot).There was no significant difference on nitrogen distribution between clones.Nitrogen efficiency of clones significantly higher under high nitrogen than low nitrogen,but variation degree among clones under low nitrogen was higher than that under high nitrogen.Variation degree of both of nitrogen absorption efficiency and nitrogen utilization efficiency was much higher under low nitrogen.Increasing nitrogen application rate could improve nitrogen absorption efficiency significantly,but declined nitrogen utilization efficiency.Based on the results of correlation analysis,nitrogen absorption efficiency contributed more to the nitrogen efficiency than nitrogen utilization efficiency.Nitrogen efficiency of 2-7 and 015-1 clones were higher than others under both high and low nitrogen treatments.
Absorption efficiency
Nitrogen deficiency
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Synopsis Nitrogen fertilization generally increased visual disease symptoms in eight spring wheat varieties infected with barley stripe mosaic and grown in irrigated plots. The nitrogen content of the diseased plants was higher than that of the non‐diseased, and was not affected by nitrogen fertilization. Diseased plants, because of lessened growth, absorbed less soil and fertilizer nitrogen.
Nitrogen fertilizer
Nitrogen deficiency
Mosaic
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The experiment studied the influence of slag system on nitrogen content in high nitrogen steels which refined by the method of high-pressure and bottom-blowing nitrogen under the conditions of 1.0Mpa. The results shows that nitrogen content are up to 1.0% without the over of slag, and after adding slag, nitrogen content are up to 1.39%; Alkalinity of protecting slag has little effect on the nitrogen content, however, there are very effective to increase nitrogen after using CaF2 instead of SiO2 ,and its nitrogen content are as high as 1.48%; the effect of increasing nitrogen are clear by adding no more than 0.5% pure aluminum, but when aluminum content are more than 0.5%, the nitrogen content in steel are not change significantly, meanwhile, if adding CaF2 slag system, it will be more effective increase nitrogen than only adding pure aluminum.
Alkalinity
Slag (welding)
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Effects of nitrogen application period on nitrogen accumulation,translocation and nitrogen use efficiency were studied.The main results as following: compared with CK,nitrogen application increased NHI and amounts of nitrogen accumulation in plants and grain.The amounts of nitrogen accumulation in ear increased quickly after silking,nitrogen translocation of stem and sheath happened mostly in early filling stage,nitrogen translocation of leaf happened mostly in middle and later filling stage.Nitrogen application made nitrogen physiological efficiency declined 16%,nitrogen fertilizer efficiency was no obvious difference among three treatments.The 60%-70% in total nitrogen accumulation amounts of plants was accumulated from silking to maturing stage,the nitrogen accumulation amounts and nitrogen use efficiency of T4 were highest,compared with T2 and T3,the NUE of T4 heightened 21.8 and 22.8 percent points.
Nitrogen deficiency
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The relative analyses show that the correlation extents were different between various nitrogen forms and nitrogen absorption contents of maize in Albic soil of east regions of Heilongjiang Province.The N0 value,available nitrogen,hydrolizable nitrogen,amino acid-nitrogen and mineralizable nitrogen had very significant positive relation with nitrogen absorption contents of maize.Also,the total nitrogen,amino sugar nitrogen and ammonium nitrogen had significant positive relation with nitrogen absorption contents of maize.But the unidentified nitrogen,unhydrolizable nitrogen had no relation with the nitrogen adsorption contents of maize.
Nitrogen deficiency
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Nitrogen gas
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Abstract Nitrogen release values obtained by an incubation technique were closely correlated with yield responses of winter wheat to nitrogen on a wide range of soils over four seasons. On soils of low nitrogen status highest yields were obtained from early‐spring applications of nitrogen. On soils of high nitrogen status the highest yields were obtained from latespring applications of nitrogen.
Nitrogen deficiency
Winter wheat
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