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Potash News

The Potash Development Association publishes both technical Potash News items and shorter Blog items. Potash News provides the latest up to date information on Potash and its use, while blog items are shorter and more timely.

If you are in the UK or Ireland and are interested in receiving Potash News items through the post free of charge, then sign up on the contact page. Recipients of the Potash News can receive CPD points for BASIS, NRoSO, and Dairy Pro.

Magnesium as a Nutrient for Crops and Grass

December 2017

Dr Ian Richards, Independent Consultant, Ecopt. Introduction The 13 or so essential nutrients for plants are grouped, in fertiliser regulations, into primary nutrients (nitrogen, phosphate and potash), secondary nutrients (calcium, magnesium, sulphur and sodium) and micronutrients (manganese, copper, boron etc) according roughly to the amounts needed by crops. Don’t be deceived by the term ‘secondary’; […]

Sulphur as a Nutrient for Crops and Grass

September 2017

Introduction Sulphur is an essential nutrient for all plants, and certain crops are more vulnerable to deficiency than others. Historically, in the UK sulphur was deposited on land from the atmosphere in quantities which were adequate for our crops. However, as the burning of UK coal (high S) in power stations was switched to imported […]

AHDB Nutrient Management Guide (RB209)

June 2017

AHDB have just launched their new Nutrient Management Guide (RB209). It is a revision of the Defra Fertiliser Manual (RB209) and it can be viewed or downloaded to your computer from their website www.ahdb.org.uk/rb209. Also, there is an App for mobile devices. Hard copies can be requested by e mail to cereals.publications@ahdb.org.uk. It is supplied free […]

Low Soil P & K Indices – Do They Matter? Yes!

March 2017

The British Survey of Fertiliser Practice (Defra) shows that since the 1980s rates of Phosphate & Potash fertiliser applications have declined by 1/3 in arable crops, and 2/3 in grassland. With the increase in yields achieved in that time, there is a serious deficit in the P & K being applied from fertilisers, which is […]

Forage Maize – Phosphate & Potash offtakes

December 2016

With the huge increase in growing forage maize to feed anaerobic digesters, especially in the arable areas of Eastern England, it seems appropriate to consider the harvested offtakes of phosphate and, especially, the high amounts of potash removed.

Soil sampling and different methods of arable cultivation

December 2016

Soil sampling for the routine measurement of P, K, Mg indices and pH is familiar to most advisers and farmers, with the same well-proven method used for many years. But how are things different where minimum cultivation is practised?

Crop Nutrition Assignment by Melissa Gorst of Newcastle University

August 2016

This year we sponsored the Crop Nutrition essay at Newcastle University and Melissa Gorst, a 2nd year agricultural degree student, won our prize with this essay.

Optimising Potash use on Cut Grassland

April 2016

Grass cut regularly, as silage, haylage or hay, removes very large amounts of potassium (K). Unless this is replaced, soil K concentrations will fall. In recent years there is evidence of an overall increase in the number of grassland soils below target index (2-), as well as a decline in the use of potash fertiliser. This situation is not sustainable and grass yields will fall unless corrected.

How we Apply Potash

January 2016

Having worked out the rate of nutrient potash required for a crop or grass, and considered the timing of the applications, we now have to select a suitable fertiliser product or other source, such as organic manures, to apply to the soil or crop. Then we have to apply it effectively to suit the crop being grown.

Planning Potash Applications

August 2015

As growers and advisers we need to know how much potash we should apply to ensure crops thrive in terms of yield and quality. Previous articles have described the way soils hold potash and how the plants use it. This article takes us on to the reality of deciding how much, and when to apply […]

The Role of Potash in Plants

May 2015

Ian Matts, Company Agronomist, Yara UK Potassium is one of the major nutrients required by all crops and is present in large quantities in the plant in the form of the cation K+. It plays a major role in achieving the maximum economic yield, as part of a balanced approach to crop nutrition, as well […]

Soil Texture and pH Effects on Potash and Phosphorus Availability

January 2015

Dr Paul Hargreaves, SRUC, Crichton, Dumfries. The application, use, efficiency and loss of nutrients including K and P can vary with soil type. Soil type is generally determined by the texture of the soil, which is a measure of the proportions of the following three particles: sand, classified as having a particle size between 0.05mm […]