Barley yellow dwarf virus is the most economically important virus in UK cereals, with severe infections causing losses of up to 60% in winter wheat and 50% in winter barley. Although this is rare, significant economic damage can occur from small populations of aphids carrying the virus. The effects of BYDV can also be exacerbated […]

Many farmers are not getting the best from their grassland because of a lack of potash. Any green material removed from fields also removes large quantities of potash which will need replacing to ensure grass productivity is maintained.

When considering the appropriate soil K Index for a crop or rotation it is important to take into account that different crops have root systems with different total lengths, depths and efficiencies. Generally speaking, the longer an annual crop is growing, the longer the root system, which means that winter combinable crops and grass etc, should have […]

The latest Professional Agricultural Analysis Group (PAAG) UK soil analysis data suggest that 33% of fields (including both arable and grassland) are below index 2- for potassium. These soils will require an application of K to replace what has been removed by the crop during the season and an additional amount to build up the […]

Last harvest there were quite a lot of last-minute decisions to bale as a result of anticipated straw shortages and higher prices. Baling and removing straw, where there is no specific requirement for other enterprises on the farm, can often be a sensible agronomic and economic decision. These include high level of residue on the […]

Patrick J. Forrestal1, Mark Plunkett1, Cathal Redmond1 and Martin Bourke21Soils, Land Use and Environment Dept. Teagasc, Johnstown Castle, Co. Wexford.2Teagasc Advisory Service, Tinnahealy, Co. Wicklow Introduction Crops including spring barley require high levels of potassium (K) to support yield, often at similar levels to nitrogen (N). Potassium has traditionally received much less focus compared with […]

I have recently seen two statements that imply that using water-soluble phosphate fertilisers increases the risk of loss of phosphate to surface water, with its adverse environmental implications, and that the majority of the phosphate applied to soil becomes fixed in the soil and is unavailable to plants. Neither statement is true..

It has been well known for decades that grass can take up and, if cut for silage or hay remove from the field, very large amounts of potash. Typical potash removal values shown in the Nutrient Management Guide (RB209) are equivalent to around 2% K in dry-matter, sometimes higher in fresh grass and lower in […]

Justus von Liebig’s Law of the Minimum states that yield is proportional to the amount of the most limiting nutrient, whichever nutrient it may be (Figure 1). Nitrogen is the nutrient that most frequently provides the largest response, suggesting that this is usually most limiting. However, the plant available potassium status of a soil has […]

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’; […]

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 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 […]