mind boggling question

In a investigation of growth in nettles, nettle seeds were planted in soil taken from 2 woods where no nettles were growing. before the seeds were planted, various mineral nutrients were added to samples of soil from each wood. when nettle plants had grown, their mean dry mass was measured. the results are shown in table.

Source of soil No of nutrients added Phosphate added Nitrate added
Wood a 6 92 5
Wood b 1 248 1

source of soil Phosphate and nitrate added All essiental nutri except phos add
wood a 125 5
wood b 281 1

sorry about the bad layout but it wont fit.

The question is which mineral nutrient was a limiting factor in the soils taken from the two woods and explain the evidence from the table for your answer.

Also another question is what are 2 major sources of phopshate which poluute rivers and lakes so are these things such as sewage and feritlisers ye??

Reply 1

Mr. Pink

if you could send a picture of the question i think i could help you... in fact i think i've done it, but now that i finished my alevels, i threw it all out :biggrin: