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Tag archive: Potassium

Podcast outlines the importance of K

In a recent GRDC Communities Crop Nutrition podcast, Dr Richard Bell from Murdoch University explained the importance of potassium (K) for optimal plant growth and reducing the effects of stressors such as drought, frost and salinity. K is second only to nitrogen in importance for crop growth. Many soils in […]

Looking closer at Colwell-K on heavy soils

Colwell potassium (K) is the go-to K test in many growing regions. Colwell-K measures extractable K and is used to estimate plant-available K.  But interpreting Colwell-K values gets tricky on heavier soils. This is partly because research on critical values has been dominated by Western Australian sandy soils. There is […]

Top tips for growers around potassium- podcast

In this episode of our GRDC Communities Podcast, Tony Cox interviews James Easton, senior agronomist from CSBP, about how producers should address the depleted state of Western Australian subsoils. He emphasises the need to conduct deep soil testing to determine the extent of potassium deficiencies and also discusses the effect […]

WATCH: Is it time to re-think P critical levels in WA?

Applying phosphorus (P) to soils with seemingly adequate P stocks can boost yield. Trials in WA are showing crop response to P above critical levels. Critical levels indicate if a crop will respond to more of a certain nutrient. Above the critical level, there’s less than a 10% chance of […]

Keep K in soils to alleviate stress

At a recent GRDC Regional Cropping Solutions Network open forum at Morawa in Western Australia, Dr Richard Bell from Murdoch University spoke of the importance of potassium (K) for optimal plant growth and alleviating crop stress. Low soil K is common in the sand and duplex soils of WA cropping […]

How are nutrients redistributed after windrowing?

Concentrating stubble into windrowed strips affects subsequent crop production, soil testing and fertiliser decisions. Wayne Pluske (Equii), Ryan Walker ( Apal Laboratories) and John Young (Wyening Mission Farm) looked at nutrient redistribution post-harvest. They measured plant material (dry matter as t/ha) and nutrient content of canola and wheat crops. The […]

Are you losing potassium from your paddock – does it matter?

graphic with text 'Do potassium losses matter', stick madn scratching head considering soil K

Potassium (K) is being gradually removed from Australia’s cropping soils. Since 2002, average crop yields have increased but K fertiliser use has remained static at around 180 kt K/yr. Soil K reserves declined an average of 4 kg K/ha/yr over the last 20 years.  Most cropping paddocks have received no […]

Do you need lime and potassium? Apply both

trail potassium plots with youtube play button

Large areas of West Australian cropping soils have low potassium (K) reserves. Acidity also constrains most of these soils.  Potassium deficiencies have become more widespread with intensive cropping, removal of hay or stubbles, and K fertiliser inputs lower than removal rates. James Easton is the Field Research Manager with CSBP […]

In tough conditions crops do better with potassium

Having sufficient potassium reduces crop damage in frost events. Field trials in Western Australia showed benefits from potassium in wheat and canola. Richard Bell is a researcher at Murdoch University. In this video he explains: Crops respond more to potassium fertiliser in seasons that stress the plants with drought or […]

Why should you address more than the most limiting subsoil nutrient?

When both phosphorus (P) and potassium (K) are both low in the subsoil there’s a strategic advantage to managing these two nutrients together. Deep phosphorus (P) deficiency is more common than deep potassium (K) deficiency. It’s unusual to see low subsoil K not accompanied by low subsoil P. Without adequate […]

Latest expert advice on deep banded fertiliser

Deep banding of phosphorus (P) and potassium (K) fertilisers has shown promising yield responses in some settings, but not in others. Deep-banding trials across Queensland and New South Wales have shown that banding rarely reduces crop yield, but it doesn’t always lead to profitable yield increases. Some of the variability […]

Potassium and crop stress

Crops may need extra Potassium when they under stress from drought or frost. There is a theoretical basis, and now GRDC funded research is looking into whether applying additional potassium is worthwhile when plants are under stress. Getting the right combination of drought and frost conditions to get meaningful results […]