scholarly journals INFLUENCE OF NITROGEN AND PHOSPHORUS CONCENTRATIONS AND RATIOS ON LEMNA GIBBA GROWTH RESPONSES TO TRICLOSAN IN LABORATORY AND STREAM MESOCOSM EXPERIMENTS

2009 ◽  
Vol 28 (12) ◽  
pp. 2610 ◽  
Author(s):  
Barry A. Fulton ◽  
Richard A. Brain ◽  
Sascha Usenko ◽  
Jeffrey A. Back ◽  
Ryan S. King ◽  
...  
Keyword(s):  
Lemna Gibba ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
Mesocosm Experiments ◽  
Stream Mesocosm

scholarly journals Opportunities for Fertilization of Loblolly Pine in the Sandhills of the Southeastern United States

2009 ◽  
Vol 33 (3) ◽  
pp. 129-136 ◽  
Author(s):  
Timothy Albaugh ◽  
H. Lee Allen ◽  
Thomas R. Fox ◽  
Colleen A. Carlson ◽  
Rafael A. Rubilar
Keyword(s):  
Loblolly Pine ◽  
Volume Growth ◽  
Average Response ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
Fertilizer Response ◽  
Foliar Nutrient ◽  
Wet Condition ◽  
Response Decisions ◽  
Research And Education

Abstract We examined growth responses to fertilization applied one or two times at three Sandhill sites versus annually at the Southeast Tree Research and Education Site (SETRES; and also in the Sandhills) and compared observed responses to the Southwide average response for midrotation fertilization (55 ft3 ac−1 year−1). At sites 1 and 2, average annual volume growth response (AVG) was significantly less (39 and 43%, respectively) than at SETRES, whereas site 3 AVG was similar to that of SETRES. At sites 2, 3, and SETRES, the AVGs of 82, 90, and 128 ft3 ac−1 year−1, respectively, significantly exceeded the Southwide average response of 55 ft3 ac−1 year−1. The diameter class with the most stems per acre at sites 2 and 3 increased 2 in. with fertilization. Resulting diameters were less than chip-n-saw size. Sandhill site fertilization may be appropriate where the superpulp premium is sufficient or wet-condition wood supply is limited. However, given the large Sandhill site fertilizer response, decisions regarding spacing, thinning, product goals, and fertilization become interdependent and require adequate planning to maximize economic return from fertilization. Foliar nutrient concentration assessments were recommended to identify nutrients other than nitrogen and phosphorus that may limit growth when fertilizing Sandhill sites.

Nitrogen and phosphorus nutrition of dryland grain sorghum at Katherine, Northern Territory. 2. Effect of rate and source of phosphorus fertilizer

1978 ◽  
Vol 18 (93) ◽  
pp. 564 ◽  
Author(s):  
RJK Myers
Keyword(s):  
Field Experiments ◽  
Grain Sorghum ◽  
Northern Territory ◽  
Diammonium Phosphate ◽  
Yield Response ◽  
Growth Stages ◽  
Growth Responses ◽  
Triple Superphosphate ◽  
Monoammonium Phosphate ◽  
Nitrogen And Phosphorus

Field experiments were conducted at Katherine, Northern Territory, in 1970-71 and 1971 -72 to examine responses of dryland grain sorghum to applied phosphorus at different growth stages. In the first, the effect of rate of application up to 100 kg P ha-1 as triple superphosphate was investigated. Growth responses to phosphorus were noted from mid-elongation onwards, but the magnitude of response varied between seasons, being greater in the higher rainfall season 1970-71. Maximum yields of grain were 7730 kg ha-1 with 50 kg P ha-1 in 1970-71, and 4440 kg ha-1 with 100 kg P ha-1 in 1971-72, which were increases of 49 and 37 per cent respectively over the appropriate zero phosphorus treatment. These suggested an increased requirement for phosphorus over previous recommendations. Phosphorus reduced the time from emergence to anthesis from 68 to 60 and from 70 to 63 days respectively in the two seasons. About half of the plant phosphorus was taken up after anthesis. It was concluded from soil analysis that phosphate-treated plots had an enhanced supply of phosphorus throughout the period of crop growth. In the second study, four phosphorus sources (superphosphate, triple superphosphate, monoammonium phosphate, and diammonium phosphate) were compared. With 25 kg P ha-1 and with constant nitrogen, grain yield response followed the order superphosphate > monoammonium phosphate > diammonium phosphate > triple superphosphate in both years. Triple superphosphate tended to give lower dry matter yields and nitrogen and phosphorus concentrations than the other three sources.

scholarly journals Phytoremediation Potential of Typha orientalis and Scirpus littoralis in Removal of Nitrogen and Phosphorus from Intensive Whiteleg Shrimp Wastewater

2018 ◽  
Vol 68 ◽  
pp. 04003
Author(s):  
Ngo Thuy Diem Trang ◽  
Lam Thi Nhu Mo ◽  
Vo Chi Linh ◽  
Hans Brix
Keyword(s):  
Rapid Development ◽  
Mekong Delta ◽  
Water Levels ◽  
Shrimp Farming ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
Shrimp Culture ◽  
Waterlogged Condition ◽  
Typha Orientalis ◽  
Whiteleg Shrimp

The rapid development of whiteleg shrimp farming in the Mekong delta of Vietnam has an adverse impact on the environment due to large amount of nitrogen and phosphorus content in wastewater and pond sludge/sediment. Phytoremediation is a promising technique to use plant for mitigating environmental impacts from intensively whiteleg shrimp culture. Growth responses, nitrogen and phosphorus removal of Typha orientalis and Scirpus littoralis were assessed at three water levels of +15 cm, +30 cm and +45 cm. They were arranged in a completely randomized design with three replications. The plants were supplied wastewater from intensive whiteleg shrimp tanks once every two weeks. Waterlogged assessment was conducted for 71 days. Water levels significantly affected plant growth rate and nutrient removal capacity. S. littoralis grew well with a lower mortality rate and had no statistical reduction of biomass compared to T. orientalis at the highest water level of +45 cm. T. orientalis had the best perfromance in growth and biomass responses to waterlogged at water levels of +15 cm and +30 cm. The results indicated that S. littoralis was the best of choice to grow in waterlogged condition of the shrimp pond for maintaining water quality.

Effects of zebra mussels (Dreissena polymorpha) on phytoplankton under eutrophic conditions

2021 ◽  
pp. 63-68
Author(s):  
Ekaterina G. Sakharova ◽  
Irina Yu. Feniova ◽  
Zoya I. Gorelysheva ◽  
Maciej Karpowicz ◽  
Andrzej Górniak
Keyword(s):  
Dreissena Polymorpha ◽  
Phytoplankton Community ◽  
Food Resource ◽  
Zebra Mussels ◽  
Filamentous Algae ◽  
Total Abundance ◽  
Nitrogen And Phosphorus ◽  
N:P Ratios ◽  
Phytoplankton Structure ◽  
Mesocosm Experiments

We conducted two mesocosm experiments (2014 and 2017) to determine how invasive zebra mussels affected abundance and structure of phytoplankton community. Algae reaction was different for the introduction of D. polymorpha in 2014 and 2017. There was no influence of zebra mussels on the phytoplankton total abundance; however, it changed the biomass of individual taxa. Cyanoprokaryota reaction as a result the zebra mussels introduction was influenced by the initial phytoplankton structure and initial nitrogen and phosphorus concentrations in water. The biomass of Сyanoprokaryotа decreased at low N:P ratios and increased at high N:P ratios. Dreissena increased the biomass of large green filamentous algae, which is a poor food resource for zooplankton.

scholarly journals Interactions of nitrogen and phosphorus cycling promote P acquisition and explain synergistic plant‐growth responses

Ecology ◽  
2020 ◽  
Vol 101 (5) ◽  
Author(s):  
Per Marten Schleuss ◽  
Meike Widdig ◽  
Anna Heintz‐Buschart ◽  
Kevin Kirkman ◽  
Marie Spohn
Keyword(s):  
Plant Growth ◽  
Phosphorus Cycling ◽  
Growth Responses ◽  
Nitrogen And Phosphorus ◽  
P Acquisition
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