scholarly journals Comparative studies on physiological and ecological characteristics of solanaceous fruit vegetables. (8). Influence of change of concentration ratios of nitrate nitrogen to ammonium nitrogen on growth, fruit development and chemical composition of xylem exudate.

1989 ◽  
Vol 27 (1) ◽  
pp. 23-29
Author(s):  
Lingfeng ZHONG ◽  
Toru KATO
Keyword(s):  
Chemical Composition ◽  
Fruit Development ◽  
Comparative Studies ◽  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
Xylem Exudate ◽  
Ecological Characteristics ◽  
Concentration Ratios

scholarly journals Observations on the mobilization of peat nitrogen in incubation experiments

1959 ◽  
Vol 31 (1) ◽  
pp. 268-281
Author(s):  
Jaakko Kivekäs ◽  
Erkki Kivinen
Keyword(s):  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
The Other ◽  
Incubation Experiments ◽  
Different Types ◽  
Working Out ◽  
Original Amount

60 peat samples from northern Finland representing different types of peat were incubated in a laboratory at a temperature of 17—18° C. The ammonium nitrogen, the nitrate nitrogen and the pH in the samples were determined after one month of incubation as well as after three months of incubation. The results were compared to results from determinations made before incubation. An attempt was made to elucidate the factors that influence the mobilization of nitrogen. On the basis of the above results it is evident that the differences between the various peat types as mobilizers of nitrogen are under these circumstances not very distinct, nor do these differences seem to be dependent on the types of peat. The following facts can, however, be established: In the amounts of ammonium nitrogen an increase takes place in most groups of samples during the first month. This increase is fairly big in the Sphagnum-dominated peats. The increase in ammonium nitrogen continues in the unlimed samples in most peat groups during all three months of incubation. After three months of incubation the amount of ammonium nitrogen in the limed samples is smaller than in the unlimed samples, although it is usually bigger than in the original samples. After the first month of incubation the amounts of nitrate nitrogen in all types of peat have decreased compared to the amounts in the original samples. In the limed samples the decrease is not as great as in the unlimed ones. After three months of incubation the amount of nitrate nitrogen has considerably increased as compared to the amount after one month of incubation. In the limed samples it might to some extent exceed the original amount of nitrate nitrogen, however, this is seldom the case in the unlimed samples. If the results are calculated on the basis of weight unit, it can be stated that the ability to mobilize nitrogen is greater in the Sphagnum peats than in the other peat groups. Working out the results in kg per ha it will be noted that somewhat more nitrogen is mobilized in the Carex-dominated than in the Sphagnum-dominated peats. The results obtained by experiments in the laboratory are not directly applicable to conditions in the field.

Рентгенофлюоресцентный анализ металлических изделий из скального погребения Узуур-Гялана (Монгольский Алтай)

2021 ◽  
Author(s):  
Мунхбаяр Б.Ч. ◽  
Keyword(s):  
Chemical Composition ◽  
Comparative Studies ◽  
Ferrous Metal ◽  
Tenth Century ◽  
Cultural Relations ◽  
Local Characteristics ◽  
Ferrous Metals ◽  
Metal Products ◽  
Non Ferrous Metals ◽  
The Comparative Study

The article describes the metalwork of the Uzuur Gyalan rock burial, popularly known online in 2016 as the «Adidas Mummy». The definitions and chemical composition of the metalware were compared with those of the time in the region. According to the results of the comparative study, the composition of the bronze mirror is very different from other bronze objects. However, bridles, saddle plaques, and ligaments are similar to the main non-ferrous metals in the region, but appear to have local characteristics. Further detailed comparative studies of the chemical composition of non-ferrous metal products in the tenth century are important steps in establishing regional cultural relations.

The effects of ammonium and nitrate nitrogen on the growth of perennial rye grass

1936 ◽  
Vol 26 (2) ◽  
pp. 249-257 ◽  
Author(s):  
A. H. Lewis
Keyword(s):  
Nitrogen Content ◽  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
Early Stages ◽  
Rye Grass

The results show clearly a more rapid and greater uptake of ammonium than of nitrate nitrogen by perennial rye grass grown in a sand-bentonite medium of pH 7·61. The extent to which the extra uptake with added ammonia was reflected in increased yields was dependent upon the age of the grass.Except in the very early stages the percentage nitrogen content of the herbage was higher where nitrate nitrogen was applied than where ammonium nitrogen was applied. This indicates that any nitrate absorbed by the plant was less, efficient in increasing yields than was ammonium nitrogen.The percentage P205 content of the grass was higher where the nitrogen was applied in the ammoniacal form than where it was applied as nitrate, and it appears that this greater P205 uptake with ammonium nitrogen resulted in increased growth.

Influence of Photochemical Reactions on the Content and Transformation of Mineral Nitrogen in Sod-Podzol Soil

2018 ◽  
Vol 781 ◽  
pp. 195-199
Author(s):  
Sergey Novoselov
Keyword(s):  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
Photochemical Reactions ◽  
Mineral Nitrogen ◽  
Light Energy ◽  
Second Stage ◽  
Humus Substances ◽  
Microbiological Oxidation ◽  
Two Stages

The article discusses the photochemical effects of sunlight on the soil. Under the influence of light energy the amount of mineral and easy hydrolysable nitrogen, as well as labile humus substances increased in the soil. The photochemical destruction of humus substances was accompanied by an increase in their mobility and loss of colour. The article shows that the process of mineral nitrogen formation in the soil during the photochemical destruction of humus substances has two stages. The first stage includes photochemical reactions with the formation of ammonium nitrogen. The second stage is the microbiological oxidation of ammonium nitrogen to the nitrate nitrogen.

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