Topographic Influence on Plant Nitrogen and Phosphorus Stoichiometry in a Temperate Forested Watershed

2015 ◽  
Vol 227 (1) ◽  
Author(s):  
Masaaki Chiwa ◽  
Shoko Ikezaki ◽  
Ayumi Katayama ◽  
Tsutomu Enoki
Keyword(s):  
Forested Watershed ◽  
Nitrogen And Phosphorus ◽  
Plant Nitrogen ◽  
Topographic Influence

scholarly journals Impact of plant functional group and species removals on soil and plant nitrogen and phosphorus across a retrogressive chronosequence

2019 ◽  
Vol 108 (2) ◽  
pp. 561-573 ◽  
Author(s):  
David A. Wardle ◽  
Michael J. Gundale ◽  
Paul Kardol ◽  
Marie‐Charlotte Nilsson ◽  
Nicolas Fanin
Keyword(s):  
Functional Group ◽  
Nitrogen And Phosphorus ◽  
Plant Functional Group ◽  
Plant Nitrogen

scholarly journals Digital imaging approaches for phenotyping whole plant nitrogen and phosphorus response in Brachypodium distachyon

2014 ◽  
Vol 56 (8) ◽  
pp. 781-796 ◽  
Author(s):  
Richard Poiré ◽  
Vincent Chochois ◽  
Xavier R. R. Sirault ◽  
John P. Vogel ◽  
Michelle Watt ◽  
...  
Keyword(s):  
Digital Imaging ◽  
Brachypodium Distachyon ◽  
Nitrogen And Phosphorus ◽  
Plant Nitrogen ◽  
Phosphorus Response ◽  
Whole Plant

scholarly journals A Proficiency Testing Program for the Agricultural Laboratory Analysis Industry

HortScience ◽  
1997 ◽  
Vol 32 (3) ◽  
pp. 456G-457
Author(s):  
Robert O. Miller ◽  
Steven E. Newman ◽  
Janice Kotuby-Amacher
Keyword(s):  
Proficiency Testing ◽  
Performance Testing ◽  
Internal Quality ◽  
Nitrogen And Phosphorus ◽  
Testing Program ◽  
Plant Nitrogen ◽  
Plant Samples ◽  
Accuracy And Precision ◽  
Internal Quality Assurance ◽  
Canadian Provinces

The accuracy of soil and plant analytical results are occasionally called into question by laboratory clientele. Although laboratories generally conduct internal quality assurance procedures, there are few external performance testing programs for the industry. In 1994, a proficiency testing program was initiated for soil and plant samples for agricultural laboratories in the western United States to provide an external quality control for the lab industry. The program involves the quarterly exchange of soil and plant samples on which soil salinity, soil fertility, and plant nutrition analyses are conducted. One hundred laboratories are annually enrolled in the program from 24 states and Canadian provinces. Results of 3 years of the program indicate soil nitrate, soil pH, extractable potassium, soil and organic matter are reproducible within 10% between laboratories. Soil-extractable phosphorus (by five methods), soil-extractable boron, and soluble chloride were only reproducible within 15% to 20% between laboratories. Plant nitrogen and phosphorus results were consistent across samples, laboratories, and methods. Variability in plant nitrate increased with decreasing tissue concentrations. Overall accuracy and precision of reported results, based on the use of NIST certified reference botanical samples, were excellent for N, P, K, Ca, and Cu. Generally, for any given analysis, the results of ≈10% of the laboratories exceed two standard deviations from the mean. Overall, significant improvement was noted in the laboratory industry proficiency through the course of the program.

scholarly journals Modeling the Carbon Cost of Plant Nitrogen and Phosphorus Uptake Across Temperate and Tropical Forests

2020 ◽  
Vol 3 ◽  
Author(s):  
Kara Allen ◽  
Joshua B. Fisher ◽  
Richard P. Phillips ◽  
Jennifer S. Powers ◽  
Edward R. Brzostek
Keyword(s):  
Tropical Forests ◽  
Phosphorus Uptake ◽  
Nitrogen And Phosphorus ◽  
Plant Nitrogen ◽  
Carbon Cost ◽  
Nitrogen And Phosphorus Uptake

Preliminary investigation of the potential of four tropical emergent macrophytes for treatment of pre-treated pulp and papermill wastewater in Kenya

2003 ◽  
Vol 48 (5) ◽  
pp. 223-231 ◽  
Author(s):  
M.A. Abira ◽  
H.W. Ngirigacha ◽  
J.J.A. van Bruggen
Keyword(s):  
Removal Efficiency ◽  
Constructed Wetlands ◽  
Preliminary Investigation ◽  
Dry Weight ◽  
Batch Reactors ◽  
Nitrogen And Phosphorus ◽  
Emergent Macrophytes ◽  
Paper Mills ◽  
Plant Nitrogen ◽  
Appropriate Treatment

The potential of four aquatic macrophytes for treatment of wastewater in constructed wetlands was investigated in bucket mesocosms at Pan African Paper Mills (E.A) Limited. The buckets were operated as semi-continuous batch reactors with reversed vertical flow for a period of 3 months. Four treatments were applied involving two hydraulic retention times (HRT) and two wastewater concentrations. Plants appeared healthier and greener in treatments at HRT5 than at HRT10. Cyperus immensus and Typha domingensis had higher biomass gain compared to the other two species. Plant nitrogen and phosphorus content, based on dry weight, was lower at the end of the experiment than at the beginning in all treatments for all species. The removal efficiency achieved for COD ranged from 10 to 55% for planted buckets at HRT5 and 15 to 65% at HRT10 for similar buckets. The mean percentage COD removal in unplanted buckets was significantly lower than in planted ones. TSS removal efficiency ranged from 44-86%. Buckets planted with Typha exhibited the highest removal efficiency in all treatments. Those at HRT5 showed significantly higher removal efficiencies than those at HRT10 for all species. The results indicate that the plants are suitable for use in constructed wetlands for treatment of the wastewater provided the appropriate treatment is applied.

Plant nitrogen and phosphorus limitation in 98 North American grassland soils

2009 ◽  
Vol 334 (1-2) ◽  
pp. 73-84 ◽  
Author(s):  
Joseph Mitchell Craine ◽  
Randall D. Jackson
Keyword(s):  
North American ◽  
Phosphorus Limitation ◽  
Nitrogen And Phosphorus ◽  
Grassland Soils ◽  
Plant Nitrogen

Response ofBradyrhizobium-Inoculated Soyabean and Lablab Bean to Inoculation With Vesicular-Arbuscular Mycorrhizae

1992 ◽  
Vol 28 (4) ◽  
pp. 399-408 ◽  
Author(s):  
A. A. Mahdi ◽  
I. M. A. Atabani
Keyword(s):  
Dry Matter ◽  
Glomus Mosseae ◽  
Arbuscular Mycorrhizae ◽  
Dry Matter Yield ◽  
Triple Superphosphate ◽  
Nitrogen And Phosphorus ◽  
Field Inoculation ◽  
Plant Nitrogen ◽  
Vesicular Arbuscular ◽  
Tissue Nitrogen

SUMMARYPot and field investigations were conducted to study the effects of vesicular-arbuscular mycorrhizal (VAM) inoculation and triple superphosphate fertilization on nodulation, dry matter yield and tissue nitrogen and phosphorus contents ofBradyrhizobium-inoculated soya-bean and lablab bean in the Sudan.Inoculation of both crops with the VAM fungusGlomus mosseaein clay and sandy soils in pots increased nodulation, dry matter yield and tissue nitrogen and phosphorus contents more than triple superphosphate fertilizer, but even greater responses were obtained fromG. mosseaecombined with fertilizer. Crop responses in the two soils were similar, despite the large differences in soil physico-chemical properties.In the field, inoculation of both crops with any of four VAM fungi enhanced nodulation, dry matter yield and plant nitrogen and phosphorus contents more than did triple superphosphate.Gigaspora margaritaandGlomus mosseaewere superior toGigaspora calosporaandAcaulosporaspecies and resulted in more extensive root infection, especially in soyabean.

Management of domestic wastewater for reuse in irrigation

1996 ◽  
Vol 33 (10-11) ◽  
pp. 355-362 ◽  
Author(s):  
Oscar Vazquez-Montiel ◽  
Nigel J. Horan ◽  
Duncan D. Mara
Keyword(s):  
Management Practices ◽  
Nitrogen Concentration ◽  
Wastewater Reuse ◽  
Domestic Wastewater ◽  
Phosphorus Concentration ◽  
Nitrogen And Phosphorus ◽  
Plant Nitrogen ◽  
Crop Uptake ◽  
Treated Effluent ◽  
Southern Portugal

Treated effluent from an aerated lagoon and facultative pond system in southern Portugal, was used to irrigate fields planted to maize (Zea mays L.). The effluent was characterised with respect to its nitrogen and phosphorus content and applied by drip irrigation in response to crop evapotranspiration requirements. Nitrification of ammonia in the effluent by soil microorganisms caused a reduced soil pH early in the growing season, but this was reversed as the season continued. For most of the growth season plant nitrogen demand ensured a low soil nitrogen concentration, but towards the end of plant growth the continuous nitrogen supplied in the effluent exceeded crop requirements with a result that nitrate accumulated in the soil. The applied effluent also had a high phosphorus concentration but there was only a slight accumulation of this in the soil. The fertiliser value of the treated effluent was demonstrated by increased yields at physiological maturity and the N yield was within the range of expected values for this crop. The main removal mechanism for N during irrigation was crop uptake whereas P was removed primarily by soil processes. The advantages of wastewater reuse together with the importance of appropriate management practices for re-use are discussed.

scholarly journals The influence of organic and mineral fertilization on nutrient status, nitrate accumulation, and yield of head chicory

2011 ◽  
Vol 49 (No. 5) ◽  
pp. 218-222 ◽  
Author(s):  
M. Ćustić ◽  
M. Poljak ◽  
L. Čoga ◽  
T. Ćosić ◽  
N. Toth ◽  
...  
Keyword(s):  
Latin Square ◽  
Mineral Fertilizer ◽  
Weather Conditions ◽  
Nutrient Status ◽  
Leafy Vegetables ◽  
Nitrogen And Phosphorus ◽  
Mineral Fertilization ◽  
Nitrate Accumulation ◽  
Plant Nitrogen ◽  
Set Up

The influence of different fertilizer forms and rates on nitrogen, phosphorus and potassium contents, nitrate accumulation and yield in red head chicory (Cichorium intybus var. foliosum L.) was investigated. Field fertilization trials were set up at two localities inNorthwest Croatia in 1999 and 2000. Trials were laid out according to the Latin square scheme in five fertilization treatments: manure 5 kg/m2, three rates of complex mineral fertilizer NPK (5:20:30) – 50, 100 and 150 g/m2, and an unfertilized control variant. The results of investigations indicate that there were no significant differences between treatments in the plant nitrogen and phosphorus contents. Significant fluctuations of the chicory potassium content (3.27–4.75% K) depending on the fertilization variant were recorded only in 1999 while in 2000 all values (4.13–5.12% K) were uniform. Plant nitrate levels were influenced by weather conditions more significantly than by the form and rates of fertilizers. All the recorded values are within the limits tolerated for leafy vegetables. Comparing the trial years, yields were generally higher in 1999 (1.58–4.95 kg/m2) than in 2000 (0.40–2.70 kg/m2). No significant differences in yield were recorded between the application of stable manure and the lowest mineral fertilizer rate.

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