I'd start a week before each spray timing to give you time to get the results back and then add stuff into the tank.
Be very cautious of just single tests and even one years tests aren't really that good, you really need multiple years of results all taken at similar times through the years to be able to build a true picture of what you need or not.
Remember a tissue test is only a snap shot of that plant on that day test the same plant a week later after a warm spell ect and you'll most likely get a different result.
It took longer than a week to get my test results back from NRM. Usually 10-14 days. I did mine 2 weeks before a planned spray pass to allow enough time to get the results back & buy what I needed to add. Avoid posting samples on Thursday or Friday as they could be sat sweating in a mail sorting office all weekend.
On high pH soils, boron, copper & potash always came up as low. Whether they actually reduce yield is another matter. As Robbie says, you will start to get a longer term picture build up through repeated testing.
It’s up to you. Some do it before every planned spray pass and again with grain samples at harvest. I just did a few samples of each crop on different soil types during stem extension, more for a comparison than anything else.
If you’re a member of a buying group it’s worth asking them if they have an account. An individual gets charged a different rate in some labs.
The latest machination coming from the so-called ‘opinion formers’, who seem to have the ear of government advisors in London, is the introduction of a ‘Meat Tax’ at consumer level.
This approach, it is argued, would have the combined impact of reducing meat consumption levels (I can really see the health benefits coming through now), while also helping to reduce the overall carbon footprint of production agriculture.
What absolute drivel! In my opinion, none of this makes sense at any level. This is a scurrilous and unfounded attack on livestock farming in this part of the world.
Yet, it has to be taken seriously. I make this point because economists at Rothamsted Research have already crunched the numbers where the introduction of a ‘UK...