First year with the YARA ALS2 N-Sensor – It is fantastic! | Precision Decisions

The very first ALS2 N-Sensor to be ordered at its UK release at CropTec 2018 after a conversation between Chris Mason of Precision Decisions Ltd and James O’Reilly of Ballyragget Farm in Kilkenny, Eire.

The N-Sensor was mounted on a Fendt 939 that tows a Rauch Axent spreader and has had a very successful first year in operation as James writes.

Precision Decisions Ltd, will be supporting the YARA ALS2 N-Sensor at Lamma 2020 7-8 January. You’ll find us on the YARA stand in Hall 10, stand 10.800. Come along and have a chat about the Sensor with Chris or Simon of PD.


One of the pair of N-Sensor heads mounted on the cab roof

“We got on well with the Yara Sensor last year, it is fantastic”. James ran his own ad-hoc tests and commented.

“The system worked well in daylight and darkness, regardless of how damp the crop was”.

James went to say “To test this I spread fertiliser on a field of winter barley at 4pm and took note of the machines readings of nitrogen and came back into the same field at 3am the next morning and the machine was reading the same values at the same pin points.

The machine worked exceptionally once you were brave enough to put in very low and high limits in the agronomic calibration, and let the machine do its job. It was impressive to see the rate of fertiliser applied vary as you travelled through the crop. The machine removes the risk of over applying fertiliser in area where the crop does not need excess fertiliser. In the past I would have to remember to reduce rates in more fertile parts of the field such as under trees and now the machine takes care of this automatically”

James went on to comment.

“The crops looked very even and homogeneous during the growing season and come harvest the crops were more even and yields were very consistent which is due to the fact that the Yara Sensor will only apply nitrogen where it is required, applying more N where required and pulling up the yield while avoiding wasting N in other parts of the field and avoiding lodging, additionally at harvest time we saw gains with benefits gained through an easier combining run at more steady speeds and reduced man hours”.

“We  were unable to run the ALS2 N-Sensor across their Oil Seed  Rape crops during the 2018-19 season, but look forwards to doing so this season and seeing increased yields here also”.


James finished by saying that,

“Apart from giving more even crops and  homogeneous crops and avoiding excess waste of Nitrogen, this sensors take some of the risk out fertiliser spreading as it takes away the necessity to rely on the machine operator to pull back the fertiliser rates in known fertile areas of the field”

Ballyragget’s average yields at harvest 2019 were good recording the following figures.

Winter wheat Yields were 11.6 Ton per Ha on 370 ha of Wheat

Winter Barley Yields were 9.8 tons per Ha on 190 ha of Barley

Winter Oats yield was 9 tons per ha 165 ha of Oats



A calculation sent to James at the time he placed the order suggested that by applying his N variably across his 800ha farm James could see an additional on farm profit in excess of £43,000 at yield responses of just 3.5%


 Precision Decisons Ltd are the sole UK agent for the YARA N-Sensor