PDA leaflets

Phosphate and potash removal by crops

UK guidelines for calculation of crop removal.

NPK content of animal manures

Guidelines for total and available nutrients according to time of application.

29. Potash and the Environment

The use of potash does not have an environmental downside, but lack of K can reduce efficient plant uptake of N and P. This leaflet looks at the issues including cross-compliance and good practice.

last update: 2006

28. Why maintain soil potash reserves

A review of the factors underlying the importance of adequate reserves of potash in the soil, and the costs of deficiency.

last update: 2007

27. Fodder beet - P & K Offtake

A report on a study of fodder beet with important new conclusions on nutrient offtake.

last update: 2001

26. Nutrient requirements of forage crops

Reports on the yield potential of six different forage crops and their nutrient uptake and removal requirements.

last update: 2008

25. What you should know about fertilisers

Provides a layman's description of plant foods and explains the natural origins of potash and justification for its use as a fertiliser in simplistic terms.

24. Soil analysis: key to nutrient management planning

Comprehensive guide to soil sampling and interpretation of soil results including indispensable reference material not found in any other single source.

last update: 2005

23. Potash for organic growers

Explains the principles of manuring for organic and conventional systems and the regulations affecting the use of different potash products.

22. NK Top dressing

Reviews the pattern of nutrient uptake and removal by arable crops and details the practical approach for optimum timing of potash application.

last update: 2006

20. Potash and biosolids

Biosolids (sewage sludges) provide useful contributions of nitrogen and phosphate but virtually no potash. Typical contents of biosolids are given together with recommendations for balancing K requirements.

last update: 2007

19. Potash for heavy soils

Explains in simple terms why some heavy soils are rich in potash and provides a practical strategy for fertiliser use on clay soils.

18. Grain legumes need potash

Summarises new research findings on the potash needs of beans, peas and other grain legumes which provide important new information for anyone growing these pulse crops.

last update: 2006

17. Forage maize - fertiliser requirements

Unravels frequent misunderstandings about the nutrient requirement of forage maize. Provides clear, practical guidelines on the best form of nutrients, optimum amounts and correct timings.

last update: 2008

16. Fodder beet - fertiliser requirements

Provides a complete guide to the fertiliser requirements of this crop which has the potential to produce the highest digestible yield of any forage crop.

last update: 2001

15. Potash for potatoes

Influence of different forms and timing of potash on potato yield and quality. Recommendations for earlies, canners, maincrop and seed potato crops.

last update: Jan 2008

14. Potash for grassland

Full details of the functions, responses, uptake, removal and deficiency symptoms of potash for grass. Explanation of luxury uptake and the effect on mineral balance in herbage. Potash in manures. Recommended amounts and timing of fertiliser for re-seeding, grazing and cutting.

last update: 2005

13. Oilseed rape and potash

Requirements of potash for oilseed rape including recommendations and timing of application.

last update: 2006

12. Potash for sugar beet

Potash and sodium needs of sugar beet together with a list of typical contents of different fertiliser materials. Recommended amounts and timing for different situations.

last update: 2006

11. Potash for cereals

Full details of the functions, responses, uptake, removal and deficiency symptoms of potash in cereal crops. Recommended amounts and timing for different situations.

last update: 2005

9. Potash for silage

Long-term grass trial results giving the effects of inadequate potash application on yield, nutrient offtake, soil reserves and herbage mineral content.

8. Principles of Potash use

Reviews the principles of potash manuring. Provides target levels for soil fertility, standard offtake figures for UK crops and guidelines on how to calculate potash recommendations.

last update: 2006

7. Watch your P's and K's for Cereals

Practical Do's and Dont's for cost saving on P & K for cereals.

last update: 2005

6. Potash, Magnesium & Sodium

Reviews the interaction of these nutrients in fertilisers, soil and herbage and how this affects mineral balance in the animal. Provides the facts regarding the impact of fertiliser potash on grass staggers.

last update: 2005

5a. Results from wheat demonstration plots

Yield, soil fertility and economic implications of using inadequate amounts of potash for wheat.

last update: 2006

5b. Results from grass demonstration plots

Yield, soil fertility and economic implications of using inadequate amounts of potash for grass.

last update: 2007

4. Potash manuring for arable crops

Explains how potash is held in soil, how potash affects arable crop yields and how such response is affected by other factors such as nitrogen.

Understanding potassium and its use in agriculture

The book provides vital and clear reference material on the role of potassium in plants, animals and humans, its origins in nature, its uses to mankind, its importance and correct use in agriculture, its movement in air, water and soil, and its place in manures and fertilisers.

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