nitrogen application

[Serup]

Ours went on at VRA 50-80kgs per ha based on SAR biomass / GAI /NDVI inages

Quite a lot of variation in plant size here after variation in emergence date though the dry September weather this year so ideal situation for vra

What tool do you use to make maps with? And what source do you use to get biomass information?
I'm starting out on variable rate drilling and spreading this year, and looking for the best way to do this by myself.
My adviser have a program with a steep entrance price, and it doesn't seem to work very good. If he will make these maps for me, any economical benefit will not end in my pocket as he spend a lot of time doing this.

 

[Clive]

What tool do you use to make maps with? And what source do you use to get biomass information?
I'm starting out on variable rate drilling and spreading this year, and looking for the best way to do this by myself.
My adviser have a program with a steep entrance price, and it doesn't seem to work very good. If he will make these maps for me, any economical benefit will not end in my pocket as he spend a lot of time doing this.

I use the @Rhiza-UK system - have been very impressed with their service so far

 

[Brisel]

I’m using SOYL (satellite imagery) or Hummingbird Tech (drone). Neither have imagery ready yet!

 

[Serup]

I’m using SOYL (satellite imagery) or Hummingbird Tech (drone). Neither have imagery ready yet!

Can SOYL make the maps also?

And can any of you edit in these maps?

For maize drilling, i want to raise plant count in high yielding areas and lower in low yielding, but i also want to raise it on clay where germination is less than average. My advisor can only make maps directly from sat images fast, any editing is like a amputated version of paint 1995.

 

[Serup]

Ours went on at VRA 50-80kgs per ha based on SAR biomass / GAI /NDVI inages

Quite a lot of variation in plant size here after variation in emergence date though the dry September weather this year so ideal situation for vra

What is your reason for vra on first application? I am adviced only to do it the last time.

I have zero experience with vra so it's not because i think i know better, just trying to learn. I am only the 3rd farmer to have maps made where i come, even though they advice on over 20% of the farmed area in Denmark and mainly bigger farms. So it's new technology around here.

 

[cricketandcrops]

Have look at this https://www.at.farm can make your own maps

 

[Serup]

Have look at this https://www.at.farm can make your own maps

Does it work in Denmark?

Just looking at the Rhiza-UK.com site doesn't suggest they cover here.

 

[cricketandcrops]

Does it work in Denmark?

Just looking at the Rhiza-UK.com site doesn't suggest they cover here.

Whether it is being launched in Denmark not sure, will be launched in UK this spring, however I played around with it last spring so perhaps you can find your fields on there??

 

[JD6920s]

As someone who never been familiar with either units or acres, is a unit the same as a pound (0,45kg)?
I’ve learned to convert between acres and ha, but not this weight system. I also read Stone and bag sometimes.

The calculation formula converts units of N/ac into kg of N/ha and vice versa.
This is actual kg of “N” not product!
As a tonne of Nitram has 35.5% N in means 34.5kg of N per 100kg of product.
So it’s overall an easier way of measuring what you’re actually applying and relates to agronomist recommendations and RB209.
Once you get used to it it makes sense and is easier to understand.
If that makes any sense.

 

[Clive]

What is your reason for vra on first application? I am adviced only to do it the last time.

I have zero experience with vra so it's not because i think i know better, just trying to learn. I am only the 3rd farmer to have maps made where i come, even though they advice on over 20% of the farmed area in Denmark and mainly bigger farms. So it's new technology around here.

I think early applications are the most important as there is a lot of variability

As season moves on things usually even up

I have access to the service so might as well use it in every pass - you don’t pay per pass it’s a fixed cost per year so more you use it the more you get value from it

 

[Wombat]

How much does the Rhiza contour cost?

 

[Brisel]

Can SOYL make the maps also?

And can any of you edit in these maps?

For maize drilling, i want to raise plant count in high yielding areas and lower in low yielding, but i also want to raise it on clay where germination is less than average. My advisor can only make maps directly from sat images fast, any editing is like a amputated version of paint 1995.

Yes, I can edit the maps that are generated and alter the assumptions of how much N or what canopy model to use. Usually it applies more on the thin areas early in the season but does the opposite and feeds more to the thicker areas later. VR N only really works if the crop responds which requires good growth conditions. Dry or cold springs do not favour the system. Shorter growing seasons in hotter countries means you see less VR N used there.

You mentioned soil types - to vary seed rates you’ll need to create a map of different establishment % zones. Rhiza does this using satellite images of bare soil. SOYL uses an electro conductivity scanner machine on the ground that basically measures water content. Once you’ve identified the zones you go and assess the soils to determine the type and establishment % then create your variable rate shape files from there.

 

[Warp Land Farmer]

Bit too windy here else would be on it

 

[Wombat]

Bit too windy here else would be on it

Winds dropping here as it's clouding over, might go and get yoked up and see how we go.

 

[farmerm]

Don't shoot me, but, if you are worried about drought later in the season, why would you encourage lots of early biomass which will suck out the moisture, leaving the crop vulnerable to late season moisture deficit.

You could argue big biomass early means crop gets roots down. You can have plenty of moisture not accessible to the crop at 50cm and below in June in a season where the top 40cm drys too fast and root development stalls. Also the top 20 or 30cm of a capped soil with little ground cover can crack and loose moisture to evaporation much faster than can be crop transpires by a crop with good ground coverage. Onions are a great example of this, we often measure soils loosing 5,6,7mm of water per day in onion crops that are only transpiring maybe 2-3mm/day.

 

[neilo]

Hopefully might get a bit on this aft before I go away agin this week. Weather always seems to go nice when I am away

Meant in the nicest possible way, could you bugger off until about May then please?

 

[David.]

Listening to weather on radio just now, you will not miss much spreading weather up North, whilst you are away.

 

[Wombat]

Meant in the nicest possible way, could you bugger off until about May then please?

Haha I tried that last year and it p!ssed it down for 2months [emoji16]

 

[4course]

It's reassuring to hear others doing a simular strategy as me of big doses early, maybe I'm not such a loony as some of my neighbours think.

While on the subject of early N id really like someone like NIAB to do some trials on autumn applied N to cereals.

Certainly with rape autumn N is by far the best investment to make. I feel higher doses-if they were allowed would pay dividends, you've only got to look at any overlaps to see where the biggest, best, strongest most resilient, healthy plants are.

trials for autumn n were done in the 70s but got to bear in mind generally we are sowing earlier though seem to remember a lot doing it

 

[Hindsight]

trials for autumn n were done in the 70s but got to bear in mind generally we are sowing earlier though seem to remember a lot doing it

Inside a Nitrate Vulnerable Zone autumn application of Nitrogen is illegal. In recent years several Direct Drillers have raised this issue with EA and Defra but I understand received a negative reply.