[GpsFrontier]

OK so your knowledge is that under perfect growing conditions plants in general do not excrete any waste products into the soil.

Actually when referring to waste products (perfect conditions or not), I don't know of any type of waste products secreted/expelled by the roots of any plants at any time. Root exudate's are not considered waste products. A waste product would be a unnecessary byproduct (leftover digested food) of the plants growth/life, in short plant poop or urine.

That does not agree with what I've read elswhere which is completly undertandable considering I am reading stuff on the Internet.

You should always consider the source when deciding whether the information is creditable or not. Of course a forum is not the place to do research when you want to be sure the information is true and accurate, but it's always a good place to start, get leads, and bounce ideas off other people who have similar interests. If you have links to other information that says there is waste products expelled through the roots, I would definitely be interested in them.

Good trustworthy sources of information
.org (non profit)
.gov (government website)
.edu (educational institution) This would be the best source

Just thought I would add some quotes
Quote taken from: Xylem - Wikipedia, the free encyclopedia

"Two phenomena cause xylem sap to flow:
Transpirational pull: the most important cause of xylem sap flow is the evaporation of water from the surfaces of mesophyll cells to the atmosphere. This transpiration causes millions of minute menisci to form in the mesophyll cell wall. The resulting surface tension causes a negative pressure or tension in the xylem that pulls the water from the roots and soil.
Root pressure: If the water potential of the root cells is more negative than the soil, usually due to high concentrations of solute, water can move by osmosis into the root from the soil. This causes a positive pressure that forces sap up the xylem towards the leaves. In some circumstances, the sap will be forced from the leaf through a hydathode in a phenomenon known as guttation. Root pressure is highest in the morning before the stomata open and allow transpiration to begin. Different plant species can have different root pressures even in a similar environment."

These quotes were taken from: Phloem - Wikipedia, the free encyclopedia

"Unlike xylem (which is composed primarily of dead cells), the phloem is composed of still-living cells that transport sap. The sap is a water-based solution, but rich in sugars made by the photosynthetic areas. These sugars are transported to non-photosynthetic parts of the plant, such as the roots, or into storage structures, such as tubers or bulbs."

"Movement occurs by bulk flow; phloem sap moves from sugar sources to sugar sinks by means of turgor pressure. A sugar source is any part of the plant that is producing or releasing sugar."

"During the plant's growth period, usually during the spring, storage organs such as the roots are sugar sources, and the plant's many growing areas are sugar sinks. The movement in phloem is bidirectional, whereas, in xylem cells, it is unidirectional (upward).

After the growth period, when the meristems are dormant, the leaves are sources, and storage organs are sinks. Developing seed-bearing organs (such as fruit) are always sinks. Because of this multi-directional flow, coupled with the fact that sap cannot move with ease between adjacent sieve-tubes, it is not unusual for sap in adjacent sieve-tubes to be flowing in opposite directions."

"Cells in a sugar source "load" a sieve-tube element by actively transporting solute molecules into it. This causes water to move into the sieve-tube element by osmosis, creating pressure that pushes the sap down the tube. In sugar sinks, cells actively transport solutes out of the sieve-tube elements, producing the exactly opposite effect."

"Some plants however appear not to load phloem by active transport. In these cases a mechanism known as the polymer trap mechanism was proposed by Robert Turgeon[3]. In this case small sugars such as sucrose move into intermediary cells through narrow plasmodesmata, where they are polymerised to raffinose and other larger oligosaccharides. Now they are unable to move back, but can proceed through wider plasmodesmata into the sieve tube element."