bag nitrogen on old pasture

Tomjim · 12-08-2011 10:04pm #1

I have put 3/4 bag nitrogen on old pasture after grazing it off. It is now closed off. How long (time limit) will the nitrogen boost the grass if it is not grazed, ie when will the nitrogen stop boosting the grass.

It looks like I will need to graze the field after 3 weeks, expect cattle to be there for a week ie 4 weeks after applying nitrogen, will the nitrogen be of any benefit after the cattle have the field grazed

locky76 · 12-08-2011 11:25pm

Nitrogen has 46 units which will take a day per two units for the ground to absorb it so 23 days, maybe a lower take up rate at this time of year also.

The_Conductor · 13-08-2011 7:54am

locky76 wrote: »

Nitrogen has 46 units which will take a day per two units for the ground to absorb it so 23 days, maybe a lower take up rate at this time of year also.

It also depends on other factors such as the mean temperature and the rainfall pattern after application. 3 weeks would be the norm- unless you get abnormally low rainfall- in which case it might be necessary to extend this to 4 or even 5 weeks.

bob charles · 13-08-2011 10:32am

Nitrogen as in 27% AN or 46%urea or something else? considering you are talking about an old pasture i would be using the figure of one unit a day during ideal conditions

Tomjim · 13-08-2011 1:09pm

Its 27% nitrogen

Does the reference to 1 unit per day equate to 27 days?

bob charles · 13-08-2011 2:55pm

Tomjim wrote: »

Its 27% nitrogen

Does the reference to 1 unit per day equate to 27 days?

yip you would be right, considering old pasture wouldnt have the same demand as a new ley

blue5000 · 13-08-2011 2:57pm

If it is 3/4 bag on CAN per acre I reckon it will all be gone by the time the cattle leave the field (28days) the next time round.

3/4 bag of 27% N is about 20 units. In Spring in rapid growth grass takes up 2 units/day. This time of year depending on weather I guess it will take up 1 unit per day, Your bag N will be probably be gone in 20 days approx. Hope this helps

Grecco · 13-08-2011 5:20pm

A waste of money this time of the year

funny man · 14-08-2011 12:11pm

Grecco wrote: »

A waste of money this time of the year

Has to be the most untrue statement of the year!

Good loser · 16-08-2011 1:28am

Grecco wrote: »

A waste of money this time of the year

Wouldn't agree atall. It depends on whether he has stock to graze the growth. Admit response much better in Spring.

Grass growing very well at present.

Growth will depend on how bare the field was before spreading - and other factors. Ryegrass gives best return esp new reseeds.

There will be some after effects ( but declining) after 28 days.

N spreading should cease around Sept 15.

bag nitrogen on old pasture

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