Tests for phosphates from Rum Jungle, Northern Territory

1970 ◽  
Vol 10 (46) ◽  
pp. 592 ◽  
Author(s):  
MJ Fisher ◽  
MJT Norman
Keyword(s):  
Rock Phosphate ◽  
Field Experiments ◽  
Northern Territory ◽  
Residual Effects ◽  
Short Term ◽  
Christmas Island ◽  
Second Year ◽  
Term Response ◽  
Term Field

Phosphate-rich rock from Rum Jungle, N.T., was tested as fertilizer against Christmas Island rock phosphate dust (CIRPD) and superphosphate in two pot and three field experiments. The Rum Jungle material had little short-term value as fertilizer, but the long-term residual effects were about 60 per cent of those of CIRPD. Calcining at 450�C gave a marked improvement in short-term response in pots, but had little effect in a long-term field experiment. Pelletting the Rum Jungle material with sulphur and Thiobacillus ('biosuper') increased its effectiveness in the field at the end of the second year to the equivalent of that of superphosphate.

Short and Long-Term Responses to Changes in Hydraulic Loading in a Fixed Denitrifying Biofilm

1992 ◽  
Vol 26 (3-4) ◽  
pp. 535-544
Author(s):  
M. M. de Mendonca ◽  
J. Silverstein ◽  
N. E. Cook
Keyword(s):  
Field Experiments ◽  
Nitrate Removal ◽  
Short Term ◽  
Packed Tower ◽  
Hydraulic Loading ◽  
Denitrification Reactor ◽  
Water Field ◽  
Short And Long Term ◽  
Term Response

The long- and short-term effects of hydraulic loading were investigated in a pilot packed tower bioreactor used for denitrifying a groundwater used for drinking water. Field experiments were conducted at hydraulic loading rates of 3.63 and 7.24 m3/hr/m2. The long-term (21 day average) performance of the denitrification reactor and the short-term response (48 hour) to regular air scour are reported here. In summary, an increase in hydraulic loading resulted in a long-term increase in the half-order denitrification rate constant, so that, on average, nitrate removal was maintained in the 5.2 m tower. At the lower hydraulic loading rate (3.63 m3/hr/m2) denitrification performance in the first 48 hours after air scour was maintained; however at twice the hydraulic loading, several days were required to restore the biofilm performance to long-term average levels.

Long-term availability of phosphorus from calcined rock phosphate compared with superphosphate

1982 ◽  
Vol 33 (6) ◽  
pp. 1061 ◽  
Author(s):  
MDA Bolland ◽  
JW Bowden
Keyword(s):  
Subterranean Clover ◽  
Dry Weight ◽  
Ammonium Citrate ◽  
Soil Test ◽  
Pasture Production ◽  
Christmas Island ◽  
Second Year ◽  
Extractable Phosphorus ◽  
Term Field

The phosphorus supply from single dressings of three rates of superphosphate and Christmas Island C-grade ore calcined at either (a) 500�C or (b) 900�C were compared in a long-term field trial by measuring (i) bicarbonate-extractable phosphorus and (ii) dry weight of tops of a subterranean clover based pasture in spring each year. For superphosphate, the bicarbonate-extractable phosphorus decreased with time, whereas for the two calcined products, the amount of bicarbonateextractable phosphorous, although initially low, increased slightly with time. As measured by herbage yield, the effectiveness of superphosphate decreased from the first to the second year and thereafter changed little with time. The effectiveness of the two calcined products tended to increase with time. Superphosphate was much more effective than the two calcined products throughout the trial. The effectiveness of both calcined products were similar, despite the fact that the fertilizers differed in their proportions of total phosphorus which was soluble in neutral ammonium citrate. The bicarbonate soil test did not always predict the same future pasture production for the three phosphorus sources, indicating that different soil test calibration curves are needed for each source.

scholarly journals Influence of selection on economically valuable characters of plant-microbial populations of red fescue

2020 ◽  
Vol 21 (6) ◽  
pp. 680-687
Author(s):  
N. Yu. Malysheva ◽  
T. B. Nagiev ◽  
N. V. Kovaleva ◽  
L. L. Malyshev
Keyword(s):  
Field Experiments ◽  
Microbial Populations ◽  
First Year ◽  
Red Fescue ◽  
Second Year ◽  
Sowing Experiment ◽  
Bacterial Preparations ◽  
High Seed Yield ◽  
Term Field

Ecologization of agricultural production and at the same time increasing of its efficiency is possible through the use of bacterial preparations. In long-term field experiments of 2016-2019 valuable characters of plant-microbial populations of red fescue (Festuca rubra L) variety Severnaya 82 of lawn and pasture use were studied after re-inoculation of seeds, obtained from the parent populations, which were also developed after inoculation with rhizosphere microorganisms on the basis of preparations of Mobiline 880, Azorizin 8, Azorizin 6, Flavobacterin, Agrofil and Rizoagrin. In the sowing experiment of 2016, plants of the first year of growth from the population with Mobilin 880 significantly exceeded in height (82 cm) the control plants without seed inoculation (77 cm, LSD05 = 3.5). In the experiment of 2017, the plants of all created plant-microbial populations of the second year of growth exceeded in height (48-50 см) the control variant plants (45 cm, LSD05 = 2.3). According to the yield of green mass in the 2016 experiment, populations of red fescue with Mobilin 880 and Rhizoagrin were distinguished (by 1.1 t/ha with yield in the control of 0.80 t/ha, LSD05 =0.23). The prolongation of the effect of Flavobacteria in the experiment has not been observed. Plant-microbial populations with Azorizin 8 and Mobilin 808 proved to be promision according to the character of high seed yield: in the third generation, they had higher seed productivity (0.144 и 0.152 t/ha, respectively) compared to the control without inoculation (0.076 t/ha, LSD05 = 0.064). To create highly productive plant-microbial populations of red fescue seeds, it is necessary to search among highly productive parent populations inoculated with associative symbionts, followed by inoculation of daughter populations with the same bacterial preparations.

Critical plant phosphorus for winter wheat assessed from long-term field experiments

2021 ◽  
Vol 126 ◽  
pp. 126263
Author(s):  
Mario Fontana ◽  
Gilles Bélanger ◽  
Juliane Hirte ◽  
Noura Ziadi ◽  
Saïd Elfouki ◽  
...  
Keyword(s):  
Winter Wheat ◽  
Field Experiments ◽  
Term Field

Unfolding the case of returnees: How the European Union and its member States are addressing the return of foreign fighters and their families

2021 ◽  
pp. 1-23
Author(s):  
Carlota Rigotti ◽  
Júlia Zomignani Barboza
Keyword(s):  
European Union ◽  
Perceived Threat ◽  
The European Union ◽  
Security Threat ◽  
Short Term ◽  
Member States ◽  
Foreign Fighters ◽  
Term Response

Abstract The return of foreign fighters and their families to the European Union has mostly been considered a security threat by member States, which consequently adopt repressive measures aimed at providing an immediate, short-term response to this perceived threat. In addition to this strong-arm approach, reintegration strategies have also been used to prevent returnees from falling back into terrorism and to break down barriers of hostility between citizens in the long term. Amidst these different strategies, this paper seeks to identify which methods are most desirable for handling returnees.

Long-term field experiments of the world

2003 ◽  
Vol 49 (5) ◽  
pp. 465-483 ◽  
Author(s):  
Katalin Debreczeni ◽  
Martin Körschens
Keyword(s):  
Field Experiments ◽  
The World ◽  
Term Field

An oncology clinical trial design with randomization adaptive to both short- and long-term responses

2017 ◽  
Vol 28 (7) ◽  
pp. 2015-2031 ◽  
Author(s):  
Hao Liu ◽  
Xiao Lin ◽  
Xuelin Huang
Keyword(s):  
Trial Design ◽  
Clinical Trial Design ◽  
Therapeutic Benefit ◽  
Survival Outcome ◽  
Operating Characteristics ◽  
Short Term ◽  
Term Survival ◽  
Long Term Survival ◽  
Term Response

In oncology clinical trials, both short-term response and long-term survival are important. We propose an urn-based adaptive randomization design to incorporate both of these two outcomes. While short-term response can update the randomization probability quickly to benefit the trial participants, long-term survival outcome can also change the randomization to favor the treatment arm with definitive therapeutic benefit. Using generalized Friedman’s urn, we derive an explicit formula for the limiting distribution of the number of subjects assigned to each arm. With prior or hypothetical knowledge on treatment effects, this formula can be used to guide the selection of parameters for the proposed design to achieve desirable patient number ratios between different treatment arms, and thus optimize the operating characteristics of the trial design. Simulation studies show that the proposed design successfully assign more patients to the treatment arms with either better short-term tumor response or long-term survival outcome or both.

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