Advertisement
If you have a new account but are having problems posting or verifying your account, please email us on hello@boards.ie for help. Thanks :)
Hello all! Please ensure that you are posting a new thread or question in the appropriate forum. The Feedback forum is overwhelmed with questions that are having to be moved elsewhere. If you need help to verify your account contact hello@boards.ie
Hi there,
There is an issue with role permissions that is being worked on at the moment.
If you are having trouble with access or permissions on regional forums please post here to get access: https://www.boards.ie/discussion/2058365403/you-do-not-have-permission-for-that#latest

Phosphorus

  • 05-07-2013 12:30am
    #1
    bob charles
    Registered Users, Registered Users 2 Posts: 6,343 ✭✭✭


    I have land were there are adequate supplies of Phosphorus in the ground to grow top yielding crops when soil sampled, but just done a second round of foliar analysis and Phosphorus is dangerously deficient in the plants. There would have being slurry and NPK fert applied pre drilling aswell.
    Phosphorus levels is an issue I have being harping on about for some time but the P level allowed in our soils and the application rates are way way too low to establish/sustain intensive crops.
    Reason for deficiency is probably 100% down to (localised) the cold weather with cold soil deep down, throw in a lack of sunshine and a harsh wind and its easy see why plants are under so much stress.


Comments

  • #2
    freedominacup
    Registered Users, Registered Users 2 Posts: 7,920 ✭✭✭freedominacup


    bob charles wrote: »
    I have land were there are adequate supplies of Phosphorus in the ground to grow top yielding crops when soil sampled, but just done a second round of foliar analysis and Phosphorus is dangerously deficient in the plants. There would have being slurry and NPK fert applied pre drilling aswell.
    Phosphorus levels is an issue I have being harping on about for some time but the P level allowed in our soils and the application rates are way way too low to establish/sustain intensive crops.
    Reason for deficiency is probably 100% down to (localised) the cold weather with cold soil deep down, throw in a lack of sunshine and a harsh wind and its easy see why plants are under so much stress.

    The tillage lads around here reckon that it's into June usually before the pig slurry "gets going" i.e. starts to make a major contribution to the crop mainly due to increased soil temps. They would apply P & K to cover this gap but would be very circumspect about applying extra N as once this kicks in it will all be taken up and can lead to lodging v. quickly.


  • #3
    blue5000
    Moderators, Society & Culture Moderators Posts: 12,754 Mod ✭✭✭✭blue5000


    Beet/barley/wheat?
    The pH and temperature will have an effect too, but sure you already know that. Would slurry be affecting pH, I know it would take an awful lot to change pH. Maybe you ploughed too deep, burying some of the fertile soil from the top?

    If the seat's wet, sit on yer hat, a cool head is better than a wet ar5e.



  • #4
    mf240
    Registered Users, Registered Users 2 Posts: 4,881 ✭✭✭mf240


    Is the phos bound to some other element or not making itself available to the plant for some reason.

    Is the field suffering compaction?


  • #5
    bob charles
    Registered Users, Registered Users 2 Posts: 6,343 ✭✭✭bob charles


    everything is as it should be, slurry applied and chemical npk that went over and above what we should be spreading. It appears there is no lock up just P not available across all crops, wheat,maize,beet.


Advertisement