scholarly journals Evaluasi Karakteristik Fisik Kimiawi Perairan Situ Cibuntu, Kabupaten Bogor, Jawa Barat

2021 ◽  
Vol 11 (4) ◽  
pp. 513-523
Author(s):  
Aiman Ibrahim ◽  
Siti Aisyah ◽  
Ira Akhdiana ◽  
Lukman ◽  
Aldiano Rahmadya ◽  
...  
Keyword(s):  
Total Nitrogen

Situ Cibuntu merupakan salah satu situ yang terletak di Kabupaten Bogor, Provinsi Jawa Barat. Situ Cibuntu yang memiliki luas permukaan 2,11 ha dengan kedalaman maksimum 1,20 m dimanfaatkan sebagai kolam retensi dan sarana pemancingan ikan. Perairan situ di kawasan perkotaan dapat mengalami gangguan karena pendangkalan, alih fungsi lahan, dan aktivitas antropogenik yang dapat mempengaruhi kondisi fisik kimiawi perairan. Tujuan penelitian adalah mengevaluasi karakteristik fisik kimiawi perairan Situ Cibuntu sebagai dasar pengelolaan situ. Penelitian dilakukan pada bulan September hingga Desember 2018 di lima stasiun pengamatan. Hasil penelitian menunjukkan bahwa parameter suhu, TDS, pH, DO, dan total posfor masih masih memenuhi baku mutu air kelas III sesuai Peraturan Pemerintah No. 82/2001. Nilai total nitrogen dan total fosfor menunjukkan kondisi perairan Situ Cibuntu yang eutrofik hingga hipereutrofik.

Which Method Should Be Used to Assess Protein Intake in Peritoneal Dialysis Patients? Assessment of Agreement Between Protein Equivalent of Total Nitrogen Appearance and 24-Hour Dietary Recall

2020 ◽  
Author(s):  
Maryanne Zilli Canedo Silva ◽  
Barbara Perez Vogt ◽  
Nayrana Soares Carmo Reis ◽  
Rogerio Carvalho Oliveira ◽  
Jacqueline Costa Teixeira Caramori
Keyword(s):  
Peritoneal Dialysis ◽  
Total Nitrogen ◽  
Protein Intake ◽  
Dialysis Patients ◽  
Dietary Recall

Impact of an Open Trellis on Canopy Growth, Light Interception, Yield, and Leaf Physiology of Red Raspberry (Rubus idaeus)

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 468b-468
Author(s):  
Stephen F. Klauer ◽  
J. Scott Cameron ◽  
Chuhe Chen
Keyword(s):  
Leaf Area ◽  
Total Nitrogen ◽  
Dry Weight ◽  
Light Interception ◽  
Rubus Idaeus ◽  
Above Ground Biomass ◽  
Red Raspberry ◽  
Leaf Physiology ◽  
Total Dry Weight ◽  
Upper Third

After promising results were obtained with an open-style split trellis (two top wires) in its initial year, two new trials were established in 1997 in northwest (Lynden) and southwest (Woodland) Washington. For the split trellis, actual yields were 33% (machine-picked 1/2 season) and 17% (hand-picked) greater, respectively, for the two locations compared to the conventional trellis (one top wire). In Woodland, canes from the split trellis had 33% more berries, 55% more laterals, 69% more leaves, and 25% greater leaf area compared with the conventional trellis. Greatest enhancement of these components was in the upper third of the canopy. Laterals were also shorter in this area of the split canopy, but there was no difference in average total length of lateral/cane between trellis types. Total dry weight/cane was 22% greater in the split trellis, but component partitioning/cane was consistent between the two systems with fruit + laterals (43%) having the greatest above-ground biomass, followed by the stem (30% to 33%) and the leaves (21% to 22%). Measurement of canopy width, circumference, and light interception showed that the split-trellis canopy filled in more quickly, and was larger from preanthesis through postharvest. Light interception near the top of the split canopy was 30% greater 1 month before harvest with 98% interception near the top and middle of that canopy. There was no difference between the trellis types in leaf CO2 assimilation, spectra, or fluorescence through the fruiting season, or in total nitrogen of postharvest primocane leaves.

The Reliability of a Micro-Dumas Procedure for Determining Total Nitrogen in Soil

1963 ◽  
Vol 27 (4) ◽  
pp. 377-380 ◽  
Author(s):  
B. A. Stewart ◽  
L. K. Porter ◽  
F. E. Clark
Keyword(s):  
Total Nitrogen

Groundwater protection and diffuse nitrogen emissions to surface waters – which catchment areas have to be considered?

2007 ◽  
Vol 7 (3) ◽  
pp. 103-110
Author(s):  
C. Schilling ◽  
M. Zessner ◽  
A.P. Blaschke ◽  
D. Gutknecht ◽  
H. Kroiss
Keyword(s):  
Surface Water ◽  
Total Nitrogen ◽  
Surface Waters ◽  
Flow Path ◽  
Emission Model ◽  
Catchment Scale ◽  
Danube Basin ◽  
Nitrogen Emissions ◽  
Nitrogen Levels ◽  
Catchment Areas

Two Austrian case study regions within the Danube basin have been selected for detailed investigations of groundwater and surface water quality at the catchment scale. Water balance calculations have been performed using the conceptual continuous time SWAT 2000 model to characterise catchment hydrology and to identify individual runoff components contributing to river discharge. Nitrogen emission calculations have been performed using the empirical emission model MONERIS to relate individual runoff components to specific nitrogen emissions and for the quantification of total nitrogen emissions to surface waters. Calculated total nitrogen emissions to surface waters using the MONERIS model were significantly influenced by hydrological conditions. For both catchments the groundwater could be identified as major emission pathway of nitrogen emissions to the surface waters. Since most of the nitrogen is emitted by groundwater to the surface water, denitrification in groundwater is of considerable importance reducing nitrogen levels in groundwater along the flow path towards the surface water. An approach was adopted for the grid-oriented estimation of diffuse nitrogen emissions based on calculated groundwater residence time distributions. Denitrification in groundwater was considered using a half life time approach. It could be shown that more than 90% of the total diffuse nitrogen emissions were contributed by areas with low groundwater residence times and short distances to the surface water. Thus, managing diffuse nitrogen emissions the location of catchment areas has to be considered as well as hydrological and hydrogeological conditions, which significantly influence denitrification in the groundwater and reduce nitrogen levels in groundwater on the flow path towards the surface water.

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