Moisture, Soil Organic Matter and Nitrate Nitrogen Content Maps Using the Real-Time Soil Spectrophotometer

2000 ◽  
Vol 33 (29) ◽  
pp. 307-312 ◽  
Author(s):  
S.W. I Made Anom ◽  
S. Shibusawa ◽  
A. Sasao ◽  
K. Sakai ◽  
H. Sato ◽  
...  
1960 ◽  
Vol 11 (3) ◽  
pp. 331 ◽  
Author(s):  
NJ Barrow

When organic materials of high nitrogen content were allowed to decompose in soil, the accumulation of ammonium caused high pH. It vas shown that high pH caused increased production of carbon dioxide, sulphate, and mineral nitrogen from soil organic matter.


Author(s):  
Javier Rodrigo-Ilarri ◽  
María-Elena Rodrigo-Clavero ◽  
Eduardo Cassiraga

This paper introduces BIOLEACH, a new decision support model for the real-time management of municipal solid waste bioreactor landfills that allows estimating the leachate and biogas production. Leachate production is estimated using an adaptation of the water balance equation which considers every hydrological component and the water consumed by anaerobic organic matter degradation to create biogas and the leachate recirculation flows pumped from the landfill pond under a bioreactor management scheme. Landfill gas production is estimated considering the leachate formation process as a coupled effect through the production or consumption of water. BIOLEACH uses waste production and climate data at monthly scale and computes leachate production accounting for the actual conditions inside the waste mass. Biogas production is computed simultaneously, considering the available water to adjust the chemical organic matter biodegradation. BIOLEACH is a valuable bioreactor managing tool as it allows calculating the recirculation volume of leachate that ensures optimal moisture conditions inside the waste mass and therefore maximizing biogas production. As an illustrative example of a BIOLEACH application, the model has been applied to a real landfill located in Murcia Region (Spain) showing the economic and environmental benefits derived from leachate superficial recirculation.


OALib ◽  
2021 ◽  
Vol 08 (08) ◽  
pp. 1-16
Author(s):  
Jorge H. Ramírez-Silva ◽  
Matilde Cortazar-Ríos ◽  
Genovevo Ramírez-Jaramillo ◽  
Carlos M. Oropeza-Salín ◽  
Dinosca D. Rondón-Rivera

2019 ◽  
Vol 4 (1) ◽  
pp. 16
Author(s):  
Wahyuni Mawadatin Niklah ◽  
Ida Ayu Gede Bintang Madrini ◽  
I Made Anom Sutrisna Wijaya

Informasi keragaman  pada suatu daerah dapat dijelaskan dengan  membagi daerah tertentu ke dalam  zona homogen. Proses homogenitas dalam sistem informasi geografis dilakukan dengan menggunakan interpolasi. Interpolasi spasial adalah memperkirakan nilai sebuah variabel lapangan yang tidak termasuk dalam sampel penelitian dan berlokasi di dalam area yang dicakup oleh lokasi sampel. Tujuan dari penelitian ini untuk menggambarkan keragaman unsur hara nitrogen dengan sifat pendukung tanah seperti EC (Electrical Conductivity), pH (Derajat keasaman), kadar air, SOM (Soil Organic Matter) pada lahan sawah di Desa Maduran, Kecamatan Maduran, Kabupaten Lamongan, Jawa Timur dengan luas 142 ha. Penelitian ini menggunakan analisis spasial IDW atau jarak inverse tertimbang. Teknik IDW mengasumsikan setiap titik memiliki pengaruh lokal, yang berbanding terbalik dengan kekuatan yang dipilih dari kejauhan.  Unsur hara nitrogen tersedia pada lahan menunjukkan keragaman yang memiliki range termasuk kategori rendah hingga sedang, nitrogen pada lahan memiliki rata-rata sedang sebesar 0,25 persen. Distribusi nitrogen pada lahan termasuk kategori significant cluster yaitu distribusi secara kelompok dan memiliki hubungan pada setiap lokasi. Rata-rata sifat pendukung tanah  pH, EC, SOM, dan kadar air masing-masing sebesar (7,25; 0,852 mS/cm; 22,43% dan 10,70%). Keragaman unsur hara nitrogen yang rendah terdapat pada lahan yang memiliki kadar air  rendah, SOM gambut rendah, EC sangat rendah dan pH netral. Sedangkan unsur hara nitrogen sedang terdapat pada lahan kadar air sedang, SOM gambut sedang, EC sangat rendah hingga rendah dan pH netral.     Variability information in the area can be explained by dividing certain regions into homogeneous zones. The homogeneity process in geographic information system is carried out using interpolation. Spatial interpolation is estimating the value of a field variable that is not included in the study sample and is located within the area covered by the sample location. The aim of this research were to describe the variability of nitrogen content with soil supporting properties such as EC (Electrical Conductivity), pH (acidity level), MC (moisture content) and SOM (Soil organic matter) on paddy fields in Maduran Village, Maduran District, Lamongan Regency, East Java with an area of 142 hectares. This research used spatial IDW analysis or inverse distance weighted analysis. The IDW technique assumes each point has a local influence, which is inversely proportional to the power chosen from a distance. The nitrogen contents in paddy fields indicated by a variability had a range of low to medium categories, nitrogen content had a medium average of 0,25 percent. Nitrogen distribution included significant cluster catagories or distribution was grouped and has relationships at each location. The average supporting properties of soil were 0.852 mS/cm; 7.25; 22.43 percent; and 10.70 percent for EC, pH, MC, and SOM, respectively. Low nitrogen content variability was found in land that has low MC, low peat SOM, very low EC and neutral pH. Whereas nitrogen content were found in moderate MC, medium peat SOM, EC are very low to low and neutral pH


1963 ◽  
Vol 61 (3) ◽  
pp. 349-352 ◽  
Author(s):  
D. G. Lewis

1. Soil samples were incubated at 60% W.h.c. at 20° C. and leached after 8 and 20 weeks. On subsequent incubation, the rate of nitrate production in the leached samples was greater than that in unleached control soils. The increase in nitrate production seems to be due to an increased rate of ammonification.2. Adding 100 p.p.m. of nitrate nitrogen to the soil before incubating had no effect on mineralization.3. Adding a leachate of incubated soil to new soil samples reduced the rate of mineralization on incubation. This reduction is not due to nitrate or any other anion, since deionized leachate was equally effective.


OENO One ◽  
2000 ◽  
Vol 34 (2) ◽  
pp. 75 ◽  
Author(s):  
Cornelis Van Leeuwen ◽  
Philippe Friant ◽  
Jean-Pierre Soyer ◽  
Ch. Molot ◽  
Xavier Choné ◽  
...  

<p style="text-align: justify;">Five indicators of vine nitrogen status were compared for their accuracy to differentiate two levels of nitrogen fertilization (0 and 45 kg N / ha) : petiole total nitrogen content, leaf blade color intensity measured by a device called “N-tester”, grape juice total nitrogen content, grape juice assimilable nitrogen content and grape juice ammonium content. Differences in must total nitrogen content and must assimilable nitrogen content were highly significant between fertilization levels. They can be considered as two powerful tools to assess vine nitrogen status. Levels of must total nitrogen content and must assimilable nitrogen content were highly correlated.</p><p style="text-align: justify;">Mineralizing must in order to measure its total nitrogen content is difficult, mainly because of the presence of large amounts of sugar. This operation can take more than 12 hours and it can fail because of caramelization and the appearance of foam. We propose mineralizing must by means of microwave. Complete mineralization was obtained in only one hour. No foam or caramelization was observed on any of the samples mineralized.</p><p style="text-align: justify;">Vine nitrogen uptake is likely to vary to a considerable extend with soil parameters, even if no nitrogen fertilization is applied. Figuring among those parameters are: soil organic matter content, organic matter C/N ratio and soil organic matter turnover. The latter depends mainly on soil temperature, soil aeration, soil pH and soil moisture content. Differences in vine nitrogen status depending on the soil type were clearly evidenced by measuring must total nitrogen and must assimilable nitrogen at ripeness. Limited nitrogen uptake, as a result of particular soil conditions, can limit vine vigor and be a quality enhancing factor in red grape production. This emphasizes the role of moderate environmental stress in the production of high quality potential grapes.</p>


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