Hi!

@ANF I only got their mean values so far. They still don’t have assurance about reference values. Contacted a Crop Health Labs in US and they also don’t have anything yet.

So far what I got from a consultant I work with that is very experienced with Sap analysis is that:

“P and K are very high, Nitrogen is deficient but probably due to low molybdenum. Chloride in the new leaf is also massively excessive, not sourced from sodium more likely compost or muriate of potash”

Might be excess manure as this 20ha olive tree grove as been grazed by the calves and heifers of a herd of 300 animals. Waiting now for complete soil analysis results to confirm. Without soil analysis sap are anyway a shot in the dark.

@adrian_rubi – thanks for the tips. I will send you an email for those reports.

Another thing and assuming you are in Europe… We are starting to use ulexite based 10% boron for soil application from a UK company – both granules or liquid suspension – https://www.uknutrition.co.uk/. Couldn’t find any europpean supplier outside UK. Can’t recommend this guys enough – they have an outstanding customer support.

Besides the fact that foliar boron application (borate) is not very effective – being a huge molecule – in soil it is very leachable being an anion. Soil application of a less soluble form like ulexite allows for slow release over time and enhanced biological metabolism in the soil.

• This reply was modified 11 months, 3 weeks ago by  Andre Antunes.