• A literature search was conducted of research into trace elements in crop production systems of south eastern Australia.
• References found in the "grey" literature (primarily printed material not available on-line) was summarised into key points and entered into the On Farm Trials database.
• All of these entries, plus those found from searching the international peer reviewed journal literature were entered into an Endnote database.
• The Endnote database is made available here, along with a text version for use by researchers.
• This activity was funded by the GRDC More Profit from Crop Nutrition program.
• Keywords: zinc, manganese, molybdenum, iron, copper, boron, trace elements, micronutrients.

• Application of trace element (Mn,Cu, Zn) mix or manganese did not improve yield at the two sites.
• Application at sowing of fungicide with the separate (split) addition of 40kg/ha urea reduced Rhizoctonia seminal root infection at both sites.
• Phosphoric acid resulted in higher yields than granular P in two of the three years of the trial at the highly calcareous site (Streaky Bay) but not in the wet year; whereas at the other site (Waramboo) on the red sandy loam there was a small yield response in the wet year.

From this trial:

• Soil applications from 2015 were poorly effective at improving grain yield. Foliar applications of sulphate increased yield by about 1t/ha. Best yield increases of more than 2t/ha were achieved with a combination of soil and foliar applications. 

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Manganese. Plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Manganese. Plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Zinc. Soil and plant tests were in the deficient range. As a foliar spray, sulphate was as effective as two chelate sources for increasing leaf zinc at Z30.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Zinc. Soil and plant tests were not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Zinc. Soil and plant tests were in the deficient range. Zinc applied at seeding either as a granular fertiliser or as a fluid fertiliser increased leaf zinc Z14.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

• Current guideline of YEB values at tillering greater than 15mg Mn/kg indicative of adequate status still appear appropriate.
• No yield response recorded to application of Mn in different form or timing.

• Nutrient omission experiment at 7 sites.
• Take homes messages were that phosphorus was a limiting factor to grain yield in 2015. Zinc was limiting yield at three locations.
• Iron was a limiting factor on a grey-brown vertosol with a 50 year cropping history.
• 12 treatments were; Zero nutrients, All nutrients, - N, - P, - K, - Ca, - B, - Cu, - Zn, - Mn, - Mg, - Fe.
• Application method varied between nutrients. Both P and N were applied at sowing, at 10 kg P/ha as Trifos and 10 kg N/ha as urea, respectively. Ca, Mg, Zn, Mn, Cu and Fe were applied as chelates in a foliar spray. K was applied as Potassium citrate and B as Boron ethanolamine as foliar sprays. N and P applied at sowing, all other nutrients sprayed at mid vegetative stage. PBA HatTrick was sown at all sites at 30 plants/m2.
• Sites differed in responses.
• Rowena showed no significant responses to applied nutrients.
• The Trangie, Edgeroi and Coonamble sites showed yield responses to applied Zn of, 28, 18 and 7%, respectively. Coonamble, Nowley, Moree and North Star had responses to applied P of, 4, 15, 15 and 11%, respectively.
• Also at the Coonamble site, a grey-brown vertosol which has been cropped since the early 1960s, also showed an 8% yield response to applied Fe.
• Older cropping country is showing responses to applied P as well as Zn and in one instance Fe.

From this trial:

• The site was severely deficient in Cu for wheat. 
• Under these severely deficient conditions, soil applications of Cu were poorly effective compared to foliar sprays but fluid applications performed better than Cu enriched granular fertilisers.  However, soil applications of Cu can persist for decades.
• There was no evidence that a chelated source of Cu as a foliar spray was more effective than a sulphate source and less Cu seemed to end up in the grain with the chelated source.
• A single foliar spray of Cu prior to flowering is often sufficient to protect a cereal crop from Cu deficiency but under the severe deficiency encountered in 2015, two foliar sprays were necessary to overcome the problem completely (one at first node, the second prior to flowering).
• Cu deficiency can make a crop more sensitive to adverse conditions.  In this trial, the hot drying conditions of the early October weekend, severely scorched all plots with no or poorly effective Cu management strategies.
• The soil and leaf tests taken during this trial support that the current guidelines for Cu deficiency are still relevant to modern farming systems and varieties.  A DTPA Cu level in soil of less than 0.3 ppm in the top 10 cm is considered deficient, and 1.3 ppm Cu in YEBS is considered very deficient for wheat.

From the whole project:

Current guidelines are still relevant and effective for TE management.

Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.

No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.

Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.

Generally, all sources of foliar TE were equally effective.

From this trial:

• No change in crop performace with the addition of Manganese. As a foliar spray, sulphate was as effective as an EDTA chelate at increasing leaf manganese at Z30. Halving the recommended rate of sulphate decreased leaf manganese levels.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Manganese. Plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of Zinc. Soil and plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of zinc. Soil and plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• Grain yield increased by 7% with the addition of zinc. Effectiveness of fertiliser strategies could not be assesed with such a small increase in yield. Soil and plant tests were in the deficient range. At Z14 zinc enriched fertilisers at sowing increased leaf zinc. At Z30 a sulphate as a foliar was as effective as an EDTA chelate. 

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

• Zinc diffusion was assessed for three fertilizers in three soils of varying pH.
• The fertilizer (zincSO4-coated monoammonium phosphate, MAP; zincSO4-coated diammonium phosphate, DAP; or zincSO4 alone) was applied in the centre of a Petri dish filled with soil.
• The zinc diffusion zone was visualized at various incubation times (1, 7 and 18 days) by exposing a CaCO3-impregnated filter paper on the soil surface and colouring the zinc captured on the filter paper using dithizone.
• The extent of diffusion was also assessed through concentric sampling and chemical analysis of soil sections.
• The visualization results agreed with the chemical analyses and demonstrated the effects of soil properties and fertilizer formulation on zinc diffusion.
• Combining zinc with P fertilizer restricted its diffusion, particularly with DAP fertilizer or in high pH soils.
• Solubility considerations indicated that this was due to the formation of zinc phosphate minerals.

From this trial: 

• No crop response to the addition of copper. Soil and plant tests not in the deficient range.

From the whole project: 

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.
•  

From this trial:

• No crop response to the addition of Manganese. Plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

From this trial:

• No crop response to the addition of zinc. Soil and plant tests not in the deficient range.

From the whole project:

• Current guidelines are still relevant and effective for TE management.
• Some current interpretations of soil tests are causing issues - the suggested levels to avoid deficiencies are much higher in some lab reports than is our experience from field trials. These are creating false impressions of the extent and severity of Zn and Cu deficiencies.
• No evidence of a major increase in the incidence or severity of TE deficiencies in the cropping zones.
• Fluid delivery of TEs at seeding is a valid management strategy but rates of the target TE need to be the same as used with compounded fertilisers.
• Generally, all sources of foliar TE were equally effective.

• The critical zinc concentration in shoots ranged from 22 to 29 mg /kilogram across the 5 durum varieties.
• There was no difference in shoot zinc concentration of the 5 varieties within any of the zinc treatments, ranging from 0.025 to 5 mg / kilogram of soil.
• There was some evidence that zinc sensitive genotypes were more likely to suffer from crown rot.

• Zn deficiency was evident at mid-tillering at one site only (Streaky Bay) in treatments where zinc had not been applied.
• Manganese deficiency was not identified via tissue testing at Streaky Bay despite treatments with added manganese having better earlier growth.

• Across three years addition of trace elements and fluid fungicide in-furrow did not provide increases in emergence, tillering or final yield - although this contradicts what other farmers have reported.
• Liquid N at sowing can improve crop emergence and early vigour, especially under dry conditions .
• Full liquid systems did not provide a profit benefit (due to higher input costs) even where they did provide increased yield which was not in all years.
• Recommendation most likely to provide higher returns for this area will be an in-furrow fertiliser system that incorporates some elements of liquid nitrogen and phosphorus fertiliser ,trace elements, fungicides and granular phosphorus and nitrogen fertiliser.

• Boron phosphate compounds were synthesized by mixing boric acid and phosphoric acid (1:1 molar ratio) and heating at temperatures of 25 to 1000 °C for 1 or 24 h.
• X-ray diffraction patterns and chemical analysis results showed formation of boron phosphate compounds at low temperature • These compounds gradually crystallized with increasing temperature and heating time.
• The compounds synthesized at 300°C or less were hygroscopic, while those synthesized at 500 to 1000°C were non-hygroscopic and free-flowing.
• The solubility of all compounds decreased with increasing synthesis temperature • The solubility of compounds synthesized at 500 and 800°C increased with increasing pH.
• The compound synthesized at 1000°C was nearly insoluble and the solubility was not pH dependent.
• The release of B from the boron phosphate synthesized at 800°C for 1 hour was approximately 70% after 150 days, which confirmed its slow release.
• The characteristics of the compounds synthesized at temperatures 500 and 800°C showed that it can be used as raw materials for co-granulation with macronutrient fertilisers such as mono-ammonium phosphate.
• Such co-granulated products are currently being tested.

• Commercial granular and liquid monoammonium phosphate fertilizers enriched with zinc were incubated under dry and wet conditions to test the effects of dry sowing on fertilizer diffusion, lability, and subsequent availability to wheat (Tritium aestivum L. ‘Axe’) plants in the growth chamber using isotopic techniques.
• Fertilizer incubated in dry soil tended to have a much greater lability than in wet soil, but diffusion was limited.
• The restricted diffusion during the incubation did not negatively impact nutrient availability to plants subsequently grown in the growth chamber, however, and simulated dry sowing was not shown to have a detrimental effect on fertilizer efficiency.