Cereals 2024 Week 9 Lecture Nitrogen Nutrition Part 2 Handout
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Recovery of Applied N 2 things:
• Efficiency of fertiliser N uptake • Efficiency of Organic N (slurry etc) uptake
Crop nitrogen uptake for North Dublin site - soil N and fertiliser N components Slide 3 Explain what you see in graph
As the rate of N increased, the soil N uptake increased -Soil N uptake= 95kg/ha -Efficiency of fertiliser N recovery - 0.58 (58%)
1- What is used in Ireland and Britain as the basis for fertiliser N recommendations? 2- What is it based on? (3) 3- Whats the scape used for tillage crops and what does it mean?
1- Nitrogen Index System for Cereals 2- based on the N requirement of each tillage crop taking into account – the previous crop – manuring history of the field – soil type 3- the N index uses 1-4 scale for tillage crops – Index 1 = small release of soil N – Index 2 = medium release of soil N – Index 3 = large release of soil N – Index 4 = very large release of soil N
if your soil is in index 1 what previous crops could of been sown? (3)
1-Cereals 2-Maize 3-Veg receiving less than 200kg/ha nitrogen
if your soil is in index 2 what previous crops could of been sown? (10)
Sugar beet Fodder beet Potatoes Mangels Kale Oilseed Rape Peas Beans Leys (1-4 years) grazed or cut and grazed. Swedes removed
If your soil is index 1…
The fifth tillage crop following permanent pasture. For subsequent tillage crops use the continuous tillage table
If your soil is index 2…
The 3rd or 4th tillage crop following permanent pasture. If original permanent pasture was cut only, use index 1
If your soil is index 3…
The 1st or 2nd tillage crop following permanent pasture (see also index 4). If original permanent pasture was cut only, use index 2.
If your soil is index 4…
The 1st or 2nd tillage crop following very good permanent pasture which was grazed only
Fertiliser Recommendations follows what?
the code of good agricultural practice
What does the code of good agricultural practice require?
this requires that nutrient supply be matched to crop demand, both in terms of the quantity applied and the time of application relative to the crop yield, soil and climatic conditions
Fertiliser Nitrogen Recommendations (kg/ha) for Winter Cereals on medium soil types (where proof of higher Yield is not available) Slide 9 Fertiliser Nitrogen Recommendations (kg/ha) for Spring Cereals on medium soil types (where proof of higher Yield is not available) Slide 10 Learn both of them write it out
Nitrogen Use in Malting Barley: 1- What will fertiliser do? 2- How much fert do you apply?
1- Fertiliser Nitrogen use will increase yield 2- e.g. apply 120-135 kg/ha for a 7.5 t/ha grain yield
What N% of grain does making beer need? An extra what kg/ha can be applied to avoid low grain protein (if advised)
However moderate grain N% is required for high quality malt for making beer 20kg/ha
Malting Barley : Effect of +40 kg N on Grain Protein % - Trends over 3 Years
Year 1- Standard N yield= 9.5 +40 kg/N= 10.5 Year 2 Standard N yield= 10 +40 kg/N= 11 Year 3 Standard N yield= 9.1 +40 kg/N= 9.9
Nitrogen Use in Milling Wheat: