Fluctuations in available mineral nitrogen in a flooded rice soil on the sub-coastal plains of the Adelaide river, N.T

1969 ◽  
Vol 9 (40) ◽  
pp. 532 ◽  
Author(s):  
RW Strickland
Keyword(s):  
Nitrate Nitrogen ◽  
Ammonium Nitrogen ◽  
Mineral Nitrogen ◽  
Rice Soil ◽  
Nitrogen Levels ◽  
Growing Period ◽  
Flooded Rice ◽  
Nitrite Nitrogen ◽  
Flooded Rice Soil ◽  
Nitrate And Nitrite

Soil from the 0-3 inch and 3-12 inch layers of nitrogen fertilized and unfertilized cropped and fallow plots was sampled at two=weekly intervals throughout the growing period of flooded rice. The soil was extracted with sodium acetate-acetic acid (pH 4.8) and ammonium, nitrate, and nitrite nitrogen determined. Nitrite nitrogen levels fell from 0.4 p.p.m. before flooding to less than 0.1 p.p.m. after flooding. Ammonium nitrogen reached peak mean levels of 57 and 55 lb an acre in the surface 12 inches of the soil in fertilized and unfertilized plots respectively, eight weeks after flooding. The effect of added nitrogen was lost within four weeks of flooding. Nitrate nitrogen in the surface 12 inches of soil reached peak levels of 40 and 10 lb an acre two weeks before flooding and 28 and 25 lb an acre eight weeks after flooding in fertilized and unfertilized plots respectively. Changes in the levels of available mineral nitrogen are discussed in relation to soil pH, Eh, and temperature

scholarly journals Influence of lime on the accumulation of mineral nitrogen in incubation experiments of peat soils

1957 ◽  
Vol 29 (1) ◽  
pp. 229-237
Author(s):  
Armi Kaila ◽  
Sylvi Soini
Keyword(s):  
Nitrate Nitrogen ◽  
Nitrogen Nutrition ◽  
Ammonium Nitrogen ◽  
Mineral Nitrogen ◽  
Peat Soils ◽  
Prolonged Incubation ◽  
The Third ◽  
Nitrite Nitrogen ◽  
Incubation Experiments ◽  
Three Samples

In the present paper the effect of lime on the mobilization of peat nitrogen was studied using incubation experiments under laboratory conditions. In the first experiment in which 13 samples of virgin peat soils were incubated for four months at 7°C, lime caused a marked nitrification of ammonium nitrogen in three samples, and a fairly low increase in the ammonium nitrogen content of five samples. The accumulation of total mineral nitrogen was benefited by lime in five samples and only in one of them could a marked increase be detected. In the second experiment the amounts of lime applied to five peat samples corresponded to 4000, 8000 or 12 000 kg/ha of CaCO3. At the end of an incubation period of four months at 9—15°C the total amounts of mineral nitrogen accumulated did not depend on the fate of liming, as did the nitrification in SCp-and BCp-samples, and also, in part, in the Sp- and CSp-samples. After the prolonged incubation up to 12 months the amount of lime applied had little or no effect upon the accumulation of nitrate-nitrogen or total mineral nitrogen except in the SCp-sample in which a positive correlation between these figures existed. Traces of nitrite-nitrogen were detected in some of the samples incubated for four months with the heaviest applications of lime. In the third experiment carried out at 7°C the treatment with lime was equal to that in the second series, but half of the pots were treated with ammonium nitrate corresponding to 100 kg/ha of nitrogen. The effect of lime on the treated samples appeared to be similar to that in the untreated one. Owing to the large variation, the fate of applied mineral nitrogen could not be distinctly detected. The loss of ammonium nitrogen through volatilization from the most heavily limed pots may be a possible explanation for the lower amounts of total mineral nitrogen in the incubated BCp-samples. Some reasons for these variable results are discussed and attention is also paid to the importance of nitrification on the nitrogen nutrition of plants.

scholarly journals Non-Parametric Analysis of Nitrogen Trends in the form of Nitrate and Nitrite in Rivers and Streams of the Contiguous United States for 1990-2019

2021 ◽  
Author(s):  
Amin Mohebbi ◽  
Simin Akbariyeh
Keyword(s):  
United States ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Surface Flow ◽  
Nitrogen Levels ◽  
Nitrite Nitrogen ◽  
Rivers And Streams ◽  
Nitrate And Nitrite ◽  
Type Ii Errors ◽  
Non Parametric

Nitrogen and phosphorous support the ecosystem by supplying nutrients to algae and aquatic plants. Having them in excess results in the eutrophication of waters creating quality problems. In the past, nitrogen has been widely investigated for wells in the context of groundwater flow. However, a national-scale nitrogen assessment in rivers and streams has not received enough attention. In this research, the Wilcoxon rank sum test, as a non-parametric hypothesis testing method, has been applied to nitrogen concentration in the form of nitrate-nitrogen and nitrite-nitrogen in rivers and streams of the Contiguous United States. This approach was particularly selected because of the non-normal and positively skewed nitrogen levels occurring in the surface flow. This method was able to identify the impaired body of waters as well as quantify the confidence, significance, and errors involved. The Northern Appalachians (NAP), Northern Plains (NPL), and Xeric (XER) ecoregions were worsening in the nitrogen-nitrate condition with NAP, and XER needed immediate actions. The nitrite-nitrogen condition did not pose an immediate threat, so mitigation plans should focus more on nitrate-nitrogen remediation. It was shown that the method was superior to the two-sample t-test by yielding lower type II errors.

Ammonia volatilization from flooded rice soil using CAS and OSC methods

2021 ◽  
Vol 20 (2) ◽  
pp. 202-207
Author(s):  
S. Vanitha ◽  
V. Ravikumar ◽  
T. Sherene Jenita Rajammal
Keyword(s):  
Ammonia Volatilization ◽  
Rice Soil ◽  
Flooded Rice ◽  
Flooded Rice Soil

Inherent Properties and Fertilizer Effects of Flooded Rice Soil

2014 ◽  
Vol 13 (2) ◽  
pp. 72-78 ◽  
Author(s):  
Mulugeta Seyoum ◽  
Heluf Gebre- Kidan
Keyword(s):  
Rice Soil ◽  
Flooded Rice ◽  
Flooded Rice Soil

Dissipation behavior of hexachlorocyclohexane isomers in flooded rice soil

1989 ◽  
Vol 24 (4) ◽  
pp. 335-348 ◽  
Author(s):  
G. Singh ◽  
T. S. Kathpal ◽  
W. F. Spencer ◽  
G. S. Yadav ◽  
K. S. Kushwaha
Keyword(s):  
Rice Soil ◽  
Flooded Rice ◽  
Flooded Rice Soil ◽  
Hexachlorocyclohexane Isomers

scholarly journals Impact of Temperature on Biological Denitrification Process

1970 ◽  
Vol 7 (1) ◽  
pp. 121-126 ◽  
Author(s):  
Iswar Man Amatya ◽  
Bhagwan Ratna Kansakar ◽  
Vinod Tare ◽  
Liv Fiksdal
Keyword(s):  
Filtration Rate ◽  
Nitrate Nitrogen ◽  
Nitrate Removal ◽  
Biological Method ◽  
Biological Denitrification ◽  
Nitrite Nitrogen ◽  
Nitrogen Concentrations ◽  
In Series ◽  
Nitrate And Nitrite ◽  
Denitrification Process

Nitrate removal in groundwater was carried out by biological method of denitrification process. The denitrification and without denitrification were performed in two different sets of reactors. Each reactor consists of two columns connected in series packed with over burnt bricks as media. The filtration rate varied from 5.3 to 52.6 m/day for denitrification process. The ammonia, nitrate and nitrite nitrogen concentrations were measured at inlet, intermediate ports and outlet. The temperature varied from 10 to 30°C at 2°C intervals. The results demonstrated that high amount of nitrate nitrogen removed in groundwater at denitrification process. The nitrate nitrogen removed by denitrification varied from 3.50 to 39.08 gm/m3/h at influent concentration from 6.32 to 111.04 gm/m3/h. Denitrification was found more significant above 16°C.Key words: Over burnt brick, Denitrification, Filtration rate and TemperatureJournal of the Institute of Engineering, Vol. 7, No. 1, July, 2009 pp. 121-126doi: 10.3126/jie.v7i1.2070 

Mineral nitrogen in soils undergoing irrigated rice-upland crop rotations

1980 ◽  
Vol 20 (107) ◽  
pp. 731 ◽  
Author(s):  
IR Willett ◽  
ML Higgins
Keyword(s):  
Ammonium Nitrogen ◽  
Early Growth ◽  
Mineral Nitrogen ◽  
Lowland Rice ◽  
Rice Crop ◽  
Growth Stages ◽  
Poor Growth ◽  
Nitrogen Levels ◽  
Crop Uptake ◽  
Upland Crop

Surface soil (0-150 mm) mineral nitrogen levels were monitored in field plots undergoing rice-wheat-wheat and rice-fallow rotations to study the effects of rice growing on the mineral nitrogen content of soils for subsequent crops. Ammonium nitrogen accumulated in the soils during the first 3 weeks of flooding of the rice crop, reaching 54 mg N kg-1 in a grey clay, and 23 mg N kg-1 in a transitional red-brown earth. Thereafter, ammonium nitrogen decreased so that at the time of drainage the soils contained between 2 and 6 mg N kg-1. Nitrate levels during the flooding period fluctuated between 1 and 7 mg N kg-1. In each subsequent fallowing period, nitrate levels increased so that there was approximately 20 mg N kg-1 as nitrate present during the early growth stages of the post-rice crops. However, at the harvests of each post-rice crop, nitrate nitrogen levels had decreased to between 1 and 7 mg N kg-'. Fluctuations in nitrate levels were interpreted in terms of gains from mineralization and nitrification and losses by crop uptake, although leaching and denitrification during periods of heavy rainfall or irrigations could not be assessed. Ammonium levels in the post-rice period increased in the months of October and November when fallowed, but other fluctuations showed no consistent trends. Nitrite levels were low (< 0.6 mg N kg-1) throughout the experiments. Total mineral nitrogen levels during the early growth stages of the crops grown after the rice corresponded to between 31 and 95 kg N ha-1 in the surface 0-150 mm of soil. It was concluded that in the rotations studied, lowland rice cropping did not lead to depletion of mineral nitrogen to such an extent that it could be implicated as a factor in the poor growth of upland crops grown in rotation with lowland rice.

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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