Re: Soil Results Back
This pH question has been piquing my curiosity this spring, as I study A&L
Labs' Agronomy Handbook (a bargain at $6). They, too, have a table of
Nutrient Availability in relation to pH, which is fascinating. I think we
traditionally have thought 6.5 to 6.8 was optimum, but should that be
adjusted? I've heard that Howard Dill aims for pH around 7.0. At least one
of the Checkons' 1100+ pumpkins was in pH above 7 - Larry, wasn't it 7.3?
Len Stellpflug told me the pH was 7.4 where he grew his 1056.5. It would be
very interesting to do a pH survey of all the 1000+ or 900+ pumpkins. Is
there some particular nutrient that is especially critical for AG's that is
more available at the higher pH's??
Beth
###
>6.2 - 6.8 allows the plants to take up a good balance of Magnesium &
>Calcium. Above 6.8 starts to restrict the uptake of Mag, (not sure if it
>was Mag or Calcium above 6.8) but one of them is locked up above the
>6.8..... (George B.)
>>>George and List, On a chart I have Calcium uptake drops off about 8.5 and
>>>Magnesium uptake drops off about 9.2! IRON uptake drops off about
>>>6.5-Boron starts to drop off at 7.0 -Copper and Zinc start their decline
>>>at 7.2 - Magnesium uptake is not at its peak till your pH reaches 7.3-
>>>Calcium is not at its peak till you pH is 6.8 (Alan R.)
Conflicting info I guess but we need to stay within 6.2 - 6.8 for optimum
growth anyway. The info I got came from Dr. Bill Lord from UNH. (George
B.)
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