Dear colleagues,
Who hes experience wit application of soft ground rock phosphate in organic farming (Commission regulation /EC/ No 889/2008, anex I); includes all kinds of application: meadows, pastures, vineyards, orchards, olive groves !?
Thank you; Ante Biško
DEAR Ante Biško
YOUR QUESTION IS NOT CLEAR.KINDLY UPDATE ON WHICH PARTICULAR ASPECT YOU ARE ASKING INFORMATION ON ROCK PHOSPHATE SO THAT ONE MAY BE ABLE TO UNDERSTAND IT AND RESPOND.
@ Ante, soft ground rock phosphate is mined from clay deposits, I suppose, that contain organic phosphorus which can very well be used in organic farming to enrich phosphorus concentration in the organic fertilizer. That may also helps to enhance P mobilizing enzyme concentration.
The ability to have solubility of soft ground rock phosphate is highly dependent on soil pH with a pH between 6.0 to 7.3 which means either liming or sulfuring will be needed for the optimization. For greater efficiency the developing of stocks which have adapted mycorrhizae can facilitate the biology needed to optimize the chemistry. Too much phosphate can inhibit the activity of the mycorrhizae. It will be good to start off with soil testing to understanding the soil constraints you might be working with and also refine your nutritional plan by using foliar analysis. The most common negative side effect of over Phosphorus application can be both the inhibition of mycorrhizae and promoting of inhibition of Zinc nutrition. Full scale chemical analysis is useful both in the soil and in the plant foliage to get the nutrition right.
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