G,day, My interest in this thread "grows" by the minute.....Kstaven:.My understanding of high soluble Al is associated with low PH levels,if your low PH is confined to the top 6ins of your soil profile you may be able to correct it with the application of lime.(our Granite based soils run from 4.5/5.5 and the acidity runs down to bedrock,we could apply lime for 100 yrs and still not have any impact).......We actually feed Ca in our mineral mix in the form of CaMg(C03)2,the other thing we do is to "not" fight our acid soil(our sheep operation is "grass based",we feed "no anything",no N or P is spread ,no mech soil disturbance and all weed control is herb-aside based using a backpack(no blanket spraying and only narrow spectrum chemicals are used).....Our whole pasture operation is based on native grasses and "naturalized exotics"(as a result of the drought anything that survived is acceptable)...... .We use only "natural occurring minerals" delivered down the throat and it leaves the other end in a state that plants can absorb and utilize immediately..This method of delivery means that the animals system is balanced by supplying shortfalls in the acid soils and therefor the grasses are also defecient.....The decision to take the mix is entirely up to the sheep,we have used the same thing on cattle ,goats as well as the sheep over many years...........We have been on this current property for over 12 years now,have survived the biggest drought in 100 yrs and the land is still in better shape than when we purchased it....I have just started to make our own compost for a paddock trial , but it the same as we have used in our vege gardens for "years".We are aiming for the max number of perennial species,along with any clovers we can encourage.(to protect the "crowns" we "do not" slash any dry matter).
The 1st pic is taken up the slope and the 2nd is down the slope,the key is the small tree with the "black trunk".
I must confess that I am a little confused by your commercial "mineral mixes",are they pre-mixes or protein supplements with minerals added?..Perhaps some of you could "scan" in the typical analysis and /or the ingredients in % breakdown of your current mix (or you can PM the details if you prefer and I will comment further later).
IMO the salt /mineral blocks sold commercially are just salt and the ingredient that the stock needs is in such small quantity's,that the stock have to consume a vast amount to try and satisfy the mineral need...We use salt in our mix ,but by volume it only represents 3 parts in a 13 & 1/2 part mix.. We purchase the ingredients separably and measure with a coffee cup and mix it in a bucket,it is placed in old "drench drums"(20 lt) with a face "cut out" and hung on the fence near a water point. I have observed that lambs will take the mix after about 4 weeks of age(when they start grazing the pasture).
I understand that many of you live in "harsh" winter climates and have to hand feed ,due to the lack of available pasture,anyway I look forward to your reactions to this post..............................T.O.R.......................................