Spring Barley
Spring Barley N Advice
Nitrogen recommendations for Spring Barley based on soil N index and crop yield potential (kg/ha)* | |||
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Soil N Index | 6.5 | 7.5 | 8.5 |
1 | 135 | 155 | 175 |
2 | 100 | 125 | 150 |
3 | 75 | 95 | 115 |
4 | 40 | 60 | 80 |
To convert kg/ha to units/ac multiply by 0.8 |
* Proof of higher grain yields is required for an additional 20kgN/ha for each one tonne above a base grain yield of 6.5t/ha
* Higher grain yields shall be based on the best yield achieved in any of the 3 previous harvests, at 20% moisture content.
P & K Advice for Spring Barley
P & K Advice (kg/ha) for spring barley based on different crop yields (t/ha) | ||||||
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Soil P & K Index | 6.5 | 7.5 | 8.5 | |||
P | K | P | K | P | K | |
1 | 45 | 105 | 49 | 115 | 53 | 125 |
2 | 35 | 90 | 39 | 100 | 43 | 120 |
3 | 25 | 75 | 29 | 85 | 33 | 95 |
4 | 0 | 0 | 0 | 0 | 0 | 0 |
To convert kg/ha to units/ac multiply by 0.8 * Higher grain yields shall be based on the best yield achieved in any of the 3 previous harvests, at 20% moisture content. *Where pH is greater than or equal to 7, 20kg P/ha may be applied on soils at phosphorus index 4. |
* Always adjust nutrient applications where organic manures are applied
Suggested N Programme for 7.5t/ha Spring Feeding Barley on soil N index 1 | |||
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Crop Type | Seedbed | Mid Tillering | GS 31/32 |
Feeding Barely Option 1 (155kg/ha)1 |
50kg/ha | 105kg/ha | ----- |
Feeding Barely Option 2 (155kg/ha)1 |
50kg/ha | 70kg/ha | 35kg/ha |
Feeding Barely Option 3 (155kg/ha)1 |
50kg/ha | 55kg/ha (GS 12-21) |
50kg/ha (GS 24-30) |
* Splitting the main N spilt for feeding barley (?:?) reduces risk of N losses (Option 2)
* For thin crops to encourage tiller numbers, split nitrogen during tillering.
Suggested N Programme for 7.5t/ha Spring Malting Barley on soil N index 1 | |||
---|---|---|---|
Crop Type | Seedbed | Early Tillering | GS 31/32 |
Malting Barley (155kgN/ha) |
45kg/ha | 75kg/ha | 35kg/ha2 |
Nitrogen for Malting Barley Research Update
Summary of Teagasc research over the last 3 years shows the following:
- N rate has the largest effect on grain protein rather than N timing
- Results indicate that fertiliser N rates between 150 to 160kgN/ha gives highest probability of achieving malting barley protein specifications where soil N supply is modest.
- Adjust N rates downwards where soil N supply is high or where organic manures are applied
- Little effect of not putting N into the seedbed (and putting the first N on at tramlines visible stage instead) on either grain yield or protein content
- Splitting the main N application had little effect on grain yield or protein on average over seasons and sites
- Delaying a proportion of the main N application until flag leaf/heading tended to lead to increased grain protein contents but with a risk of reduced yield, and so is not recommended. Applications of N should be completed by GS32
- Low protein levels experienced in 2011 were due to reduced soil N supply combined with relatively low fertiliser N recovery.
- In 2012 the higher proteins were due to higher soil N supply compared to 2011.
- In 2013 soil N supply was similar to 2012 but fertiliser N recovery was higher and in some areas yields appeared to have been limited by drought which further increased proteins.
Requirements for additional N on Spring Malting Barley
The following will be required for additional N application to malting barley crops
1. A contract between the farmer and recognised assembler of malting barley
2. Written advice by an agronomist (level 8 or CCFAS) saying that extra N is needed.
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Advice is given as per crop recommendation report
3. Additional N can only be recommended where the average protein content of the malting barley supplied by the holding is under 9.5% crude protein.
One year’s records required to show this (one of the past 3 yrs)
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Records of low proteins as provided by malting barley assembler
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The reference yield (6.5t/ha) for spring barley to be used to determine the area of malting barley grown.
For example a grower growing a contract malting barley tonnage of 260 tonnes would require 40ha of malting barley to fill contracted tonnage of grain. Additional N in this example would be 40 x 20kg N/ha = 800kgN.
From the above 3 pieces of information is required in anyone year to get the additional N allowances for malting barley crops