PDA News
The PDA publishes both technical News items and shorter Blog items. PDA News provides the latest up to date information on macronutrients and their use, while blog items are shorter and timelier.
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Price implications for P&K applications
Cost and price rises are a frequent focus in the world right now, but especially within agriculture due to the circumstances in Ukraine and the sanctions imposed on Russia as a result. Although within arable farming, 2022 should produce reasonable returns, livestock farmers may not be so fortunate, whilst there is much greater uncertainty beyond this for all.
May 2022
Potash and sugar beet
During the last four decades, yields of clean beet and sugar in the UK have been increasing linearly, at an average annual rate of 0.8 t/ha of clean beet. In this article, we consider if the currently recommended potash application rates are adequate to support this.
March 2022
Potassium and nitrogen interactions in crops
Nitrogen has hit the headlines in the last few months, not just within agriculture, but across the mainstream media on the back of factory closures. Within agriculture the focus has clearly been on the steep price rises and the resulting impact on the economic optimum rates. These calculations are wholly justified, but as is often the case, are very singular focussed.
December 2021
The release of nutrient reserves in soil
Maintaining the fertility of agricultural soils is of paramount importance, not only for the present but also for the future. Soil analysis, and its interpretation, is an important management tool in assessing the need to apply nutrients to maintain soil fertility.
October 2021
Crop establishment
Establishment is the most critical period in any annual crops life-cycle, as it is the time when the yield potential is set. All challenges the crop faces during the season serves to reduce the final yield from this potential. Therefore, conversely, any management decisions taken from this point onwards only helps limit the reduction in this yield potential.
September 2021
Farming rules for water
More than three years after their introduction, the Farming Rules for Water hit the spotlight due to increasing concerns surrounding the interpretation of the rules by the Environment Agency. Although manures are a good source of nutrients for crops, there is increasing scrutiny on their usage as farmers are encouraged to fully account for the nutrients they supply and closer match the timing of application to the soil or crop need.
September 2021
Potash for oilseed rape
With oilseed rape prices reaching well over £500/t before bonuses, the market appears to be telling growers to plant more of the crop. But with OSR’s very high demand for potash, especially in the spring, serious consideration should be given to the major inputs for this crop.
August 2021
The situation regarding P&K balances
When looking at P&K balances in detail over the last five years, including fields where no applications were made, the overall balances are dramatically negative. Maintaining soils at the target index is the safest way to ensure these crops are able to access the required quantities at the appropriate times to optimise growth, yield and therefore financial returns.
June 2021
Maize nutrition
To produce a good crop, maize plants need to grow very rapidly once they have germinated. To achieve this, a good soil structure, adequate soil moisture and warm soil temperatures (8-12°C) are essential. Maize can easily produce 50 t/ha in a period of four months and therefore has a large demand for nutrients. Any shortage […]
April 2021
Sugar beet nutrition
Sugar beet has a large requirement for potassium, with the majority taken up during the early months of growth. For maximum sugar yield it is essential to optimise the interception of solar radiation (sunlight) to provide the energy for the conversion of carbon dioxide to sugars. This requires a rapidly expanding leaf canopy. Nitrogen drives the rapid […]
April 2021
Nutrient Use Efficiency
Nutrient, particularly nitrogen, use efficiency (NUE), is a particular talking-point currently within the industry as government considers ways to help reduce the impact of agriculture on greenhouse gas emissions. The Campaign for the Farmed Environment states the aim as more efficient nutrient management to reduce greenhouse gas emissions, through better fertiliser application and management of […]
March 2021
Role of potassium in frost resistance
With the recent cold conditions experienced throughout the UK it is worth considering the impact of nutrition on plant tolerance to cold. The role of K in protecting crops against frost damage is widely recognised, however the detail behind the mechanisms may not be so clearly understood. When potash is deficient in plants, the stomatal […]
February 2021