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1

Phosphorus balance in Hungary and selected European countries

100%
Csatho P.
Nawozy i Nawożenie
|
2002
|
tom 04
|
nr 4[13]
2

The balance of phosphorus in the agriculture of Poland

86%
Tujaka A., Terelak H.
Polish Journal of Agronomy
|
2012
|
nr 09
3

Nitrogen and phosphorus loading in Slawno Lake as a result of fish production intensification

86%
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2003
|
tom 05
4

The phosphorus in Czech agriculture

86%
Budnakova M., Cermak P., Ciganek K., Travnik K.
Nawozy i Nawożenie
|
2002
|
tom 04
|
nr 4[13]
5

Comparison of the phosphorus balance results based on 'field surface' and 'farm gate' methodology in large-scale farms

86%
Kupiec J. M.
Polish Journal of Agronomy
|
2015
|
nr 22
The aim of the study was the comparative analysis of the results of the phosphorus balance calculated by two methods, in the field scale and the farm scale, and assessment of usefulness of the application of balances in monitoring the agricultural production. Twenty-six large-scale farms were selected for studies with the area from 204.0 to 11391.5 ha. The analyses used data from the years 2002-2006. The spatial scope included the farms located in 33 municipalities, which administratively belonged to three provinces. Twenty six municipalities were located in 7 areas particularly nitrate vulnerable zones (NVZ’s). The evaluation of phosphorous load of the selected farms in different regions was performed based on the calculation of the balance with two methods – field surface and farm gate. As research has shown although the balance of the phosphorus calculated with the field surface method was on average higher by 7.2 kg P2O5·ha-1 AL, the results obtained based on two different methodical approaches indicate similar trends. The higher balance was mainly affected by manures produced in the own farm. Maximal values of the balance in both methods remained at a similar level, reaching approx. 60 kg P2O5·ha-1 AL. In case of the field surface balance, 7 farms fitted in the standard, and in case of the farm gate balance 5 met recommendations concerning the acceptable balance for the analysed region.
6

Fertilization factors determining phosphorus balance under the conditions of permanent fertilization experiment

72%
Labetowicz J., Korc M.
Annals of Warsaw Agricultural University. Agriculture
|
1999
|
nr 35
31-38
7

Environmental constraints of phosphorus management in agriculture

72%
Leinweber P.
Nawozy i Nawożenie
|
2002
|
tom 04
|
nr 4[13]
8

Phosphorus balance at various water flows in a lake restored by hypolimnetic withdrawal

72%
Mientki C., Dunalska J.
International Journal of Ecohydrology and Hydrobiology
|
2001
|
tom 01
|
nr 4
Lake Kortowskie is restored by the hypolimnetic withdrawal method: rich in nutrients near-bottom waters are removed by a pipeline directly to the outflow instead of the natural outflow of surface waters. It has been found out that the amount of water discharged through the pipeline and therefore the amount of removed phosphorus depends on the surface inflow. The water balance of the lake in summer is unfavourable whereas the phosphorus balance very favourable. The latter is determined by the diminishing phosphorus loads entering the lake, and by the increasing amounts of phosphorus released from the bottom sediments. Any disturbance at the interface bottom sediments-overlying water results in continuous release of „new” phosphorus amounts to the water. In the same time near-bottom water withdrawal to the outflow cause deficiency with this element in the lake ecosystem. For optimising the estoration process such rate of pipeline outflow should be established, to reach maximal phosphorus removal at an existing hydrological balance.
9

Effects of mixed feeding schedules on growth performance, body composition, and nitrogen- and phosphorus balance in rainbow trout, Oncorhynchus mykiss

58%
Sevgili H., Emre Y., Kanyilmaz M., Diler I., Hossu B.
Acta Ichthyologica et Piscatoria
|
2006
|
tom 36
|
nr 1
Background. Reducing feed cost and the pollution originating from feed have been principal matters in fish nutrition. Mixed feeding schedules have been proposed as one of the methods to reduce both of them and successfully tested in many fish species. The aim of the present study was to determine the mixed feeding schedules′ suitability for culture of rainbow trout. Materials and Methods. Five different feeding schedules were tried by alternating the presentation of a low-protein (28.1%) diet (A) and a high-protein (49.9%) diet (B). The feeding schedules employed were 1A/1B, 1A/2B, 1A/3B, 2A/2B, and 2A/3B where the numerical values refer to the number of days each diet (A and B) was offered continuously. Fish given diets A and B continuously served as controls. Totally, seven dietary treatments were tested in triplicate for 10 weeks. Results. The fish maintained on the different mixed feeding schedules exhibited lower weight gain than those fed continuously on the high-protein diet (P < 0.05). The fish reared on schedule 1A/3B (1 day diet A alternated with 3 days diet B) had similar specific growth rate (SGR), feed conversation ratio (FCR), and protein efficiency ratio (PER) to those fed diet B continuously and was best among all mixed feeding schedules. However, the most cost-effective treatment was 2A/2B. In addition, this group compared to B resulted in significant increase and reduction of phosphorus retention and discharge, respectively (P < 0.05). The treatments significantly effected body moisture, fat- and ash levels (P < 0.05), but not protein. Conclusion. The study shows that mixed feeding schedules are promising for use in rainbow trout culture as they result in feed cost saving and reduced phosphorus discharge in the effluents.
10

Harmonisation of water management and agricultural policies in Slovenia

58%
Pintar M., Globevnik L., Bremec U.
Journal of Water and Land Development
|
2007
|
nr 11
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