06 March 2015 | Online since 2003



26 February 2013|Arable,Cereal,Crops,News

Bad weather prompts nitrogen soil fears


High levels of rainfall and the continued bad weather in the first months of 2013 have left many farmers concerned about the level of nitrogen losses that may have occurred.

Some advisers are recommending that more nitrogen be applied, as a matter of course, but with ammonium nitrate at around £300/t the cost of applying extra nitrogen cannot be ignored.

Targeting additional nitrogen applications to those fields which actually need it makes good economic sense.

Nitrogen losses will mainly come from leaching but where soils have been waterlogged or even underwater for long periods denitrification may also occur.

According to Sean Stevenson from analytical services specialists, NRM, "The exact extent of nitrogen losses through leaching and/or denitrification following heavy or sustained rainfall can be hard to quantify."

"It is the nitrate form of nitrogen that is susceptible to loss though leaching and denitrification so the extent of any loss is governed by the amount of the crop nitrogen supply that was in the nitrate form when the rainfall occurred."

Other factors also influence the extent of nitrate losses, application timing, soil characteristics the type of nitrogen fertiliser and so on.

In general leaching losses are more likely on sandy soils and denitrification more apparent on medium and fine textured soils that have poor drainage.

However the only way to be sure of how much nitrogen is in the soil is to conduct a soil mineral nitrogen test.

Stevenson explains further: "Soil Mineral Nitrogen is the nitrate-N plus ammonium-N content of the soil within the potential rooting depth of the crop."

"When estimating the total amount of N that will come from the soil – that's the Soil Nitrogen Supply (SNS) – you also need to include an estimate of the N already in the crop and an estimate of the mineralisable soil N. A test is also available from NRM to determine this mineralisable value.

"Once you have your SNS index you can use The Fertiliser Manual (RB209) to determine the correct fertiliser nitrogen recommendation."

Download



Comments


No comments posted yet. Be the first to post a comment

To post comment without approval login or register

Display name

Please enter your name

Email (optional)
Comment

Please enter your comment

Post Comment

Your comment submitted successfully.Please wait for admin approval.

Some error on your process.Please try one more time.



Jobs


2 March 2015
Band 7 Medical Recruitment Manager
The postholder will be based at Chase Farm Hospital. Our mission is to deliver world class care and expertise in our clinical...

26 February 2015
Sales Executive - LED/AV - Industry International Sales
This rapidly growing and expanding organisation seeks a talented, driven and ambitious sales professional to hunt and farm st...

18 February 2015
Lean Coordinator
Home to some of the UK's leading dairy brands, including Cravendale, Anchor, Lurpak and Tickler, Arla Foods is the UK's numbe...

21 February 2015
LGV Driver C + E & Assistant Transport Manager
Located on a busy farm, just north of the City of Nottingham, Hammond Produce is a privately owned fresh-produce packing, mar...

4 March 2015
Service Technician (Heavy Plant)
From Plant, Forklifts, Agriculture, Powered Access or similar (Not cars). The company are a world renowned manufacturer of Pl...




Top stories you may have missed
2 February 2015 | Arable
Is EU membership damaging UK farming?

Is EU membership damaging UK farming?

Membership of the EU is damaging the British farming industry, according to...


29 January 2015 | Machinery and Equipment
Drones 'rapidly changing' agriculture

Drones 'rapidly changing' agriculture

BASIS has launched an accreditation for pilots of Unmanned Aerial Systems (...


23 January 2015 | Arable
UK wheat yields have potential to double

UK wheat yields have potential to double

UK wheat yields have theoretical potential to more than double over the nex...


23 January 2015 | Machinery and Equipment
Crowds flock to LAMMA 2015

Crowds flock to LAMMA 2015

Britain’s farmers flocked to Peterborough for the first day of LAMMA’15 to ...


22 January 2015 | Cattle
Don't blame supermarkets for milk crisis...

Don't blame supermarkets for milk crisis...

The crisis in the dairy industry is not the fault of supermarkets, accordin...


16 January 2015 | CLA
Families affected by HS2 face 'major wor...

Families affected by HS2 face 'major wor...

Transport Minister Baroness Kramer visited three rural businesses in Cheshi...


16 January 2015 | Machinery and Equipment
John Deere unveil new 6R tractor range

John Deere unveil new 6R tractor range

Spearheading the John Deere range of mid-size tractors from Mannheim, the n...


14 January 2015 | Animal Health
Monthly TB checks more effective than ba...

Monthly TB checks more effective than ba...

Regular testing for bovine TB could significantly reduce the number of infe...


12 January 2015 | News
Government regulations hampering UK agri...

Government regulations hampering UK agri...

Single-issue policy-making threatens to hamper, not help, the progress of U...


8 January 2015 | Cattle
2015: The year ahead for the beef market

2015: The year ahead for the beef market

2014 has been a “rocky old year” for the beef industry but better prices ar...