Rhizosphere4

Rhizosphere4   Maastricht, Netherlands, from 21 - 24 June 2015 The Rhizosphere4 Organizing Committee is looking forward to welcome you to this exciting conference. The Rhizosphere4 website is now online; it will inform you on the latest news, updates on the scientific program, important dates, the city of Maastricht, and many other things regarding the conference. Have a look at www.rhizo4.org!   Scientific Program An exciting scientific program planned with keynote presenters Jeff Dangl (USA), Noah Fierer (USA), Toby Kiers (the Netherlands), Jos Raaijmakers (the Netherlands), Tiina Roose (UK), Choong-Min Ryu (South Korea), Angela Sessitsch (Austria), Gerald Tuskan (USA) and Franciska de Vries (UK). Session Topics for Rhizosphere4 will be: Symbiosis Root Turnover Nutrient Acquisition Signaling Root Development Rhizosphere Microbiome Engineering the Rhizosphere Rhizosphere and Climate Change Root-Root Interactions Food-web Interactions Human Pathogens in the Rhizosphere New Methods in the Rhizosphere Below and Above Ground Interactions Water Relations Rhizo Remediation and Fate of Pollutants Metabolomics Root Endophytes Please check the website for up-to-date program information, such as session titles and convenor information,  and for more information on our keynote speakers.

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Liquid Phosphorous

Poly or Ortho: The phosphate question.

Phosphorous does not exist in soils in its simple elemental form.  Phosphorous exists as inorganic or organic, with organic being chemically bonded to a carbon compound.

Ortho

A single phosphate molecule is called orthophosphate. Orthophosphate is a negatively charged anion and is the form of phosphorus absorbed through the root and taken up by the plant.

Poly

“Poly” refers to multiple phosphate molecules linked in a chain. Each linkage of phosphate molecules has a name depending on its length, although polyphosphate is the general term that includes all of these linked molecules, no matter what length. The size or length of the chain is not fixed and can be of various lengths. Thus “polyphosphate” is simply strings of “orthophosphate” ions of various lengths.

This phosphorous form is made utilising Ammonia products, therefore a valuable amount of nitrogen is supplied and the end product is referred to as Ammonium Polyphosphate ( APP).  The most common APP fertilizer is 16-23-0. Liquid 16-23-0 contains 65 to 70% polyphosphate and 30 to 35% orthophosphate. When polyphosphate is applied to the soil, moisture will add water back (hydrolyse) to the polyphosphate to form orthophosphate over time.

Polyphosphates are not absorbed by plant roots.

Why is APP helpful in P management?

The complexity (long chains of molecules) of the polyphosphate provides a barrier to the typical fixing and immobilisation of phosphorous that we see in soils.

Polyphosphate fertilizers offer the advantage of a high nutrient content in a clear, crystal-free fluid that is stable under a wide temperature range and has a long storage life. Some small amounts of other nutrients may be mixed with polyphosphate fertilizers, making it a good carrier for micronutrients that may be needed by plants

Fluids are convenient for farmers since they can be easily blended with many other nutrients and chemicals and each drop of fluid is exactly the same. For most situations, the decision to use dry or fluid fertilizers is based on the price of nutrients, fertilizer handling preferences, and field practices.

more information:

http://www.liquidp.com.au