I have data of N uptake by crop and fertilizer n added to the crop. Can I calculate NUE with just these two?
Yes! But NUE is the amount of the amount of yield per nutrient taken up. It is completely different from nutrient recovery.
NUE=[{uptake(fertilized plot)– uptake(control plot)}/amount of nutrient (soil+ fertilizer) applied]×100
It can be roughly calculated this way, if the soil nitrogen pool is in a steady-state and nonfertilizer N input is negligible.
In reality, the soil nitrogen pool of a small area of arable land (for example, a field or plot) is often unbalanced during one or two growing seasons. Therefore, the average NUE value calculated on a larger spatial scale or a longer time scale is more meaningful.
You can read our recent paper for more understanding: https://www.nature.com/articles/s43016-021-00263-3
If you have N uptake data from unfertilized soil, then you can use the above formula mentioned by "chandrakala". But if you don't have N uptake from unfertilized soil then you simply divide N uptake by N applied to soil, and you can call it apparent NUE.
But for precise calculation you need the soil nutrients data before fertilization and after harvest. Also the N uptake in all parts of the plants..
You can read our recent paper for more understanding:
Global greenhouse vegetable production systems are hotspots of soil N2O emissions and nitrogen leaching: A meta-analysis
Complexity of NUE resides in various N sources that contribute to crop production and inorganic and organic fertilizer, SOM, BNF, interplay between soil N availability, transformation, storage, movement and loss, edaphic conditions, crop genesis, weather and climate and impact of N management
NUE crop= yield Nt/ fertilizer N ( the fraction of fertilizer N that is utilized and allocated on yield N/biomass production per unit of available N Please go through the article N use efficiency.....of today and tomorrow Front. Pl. Sci June 2021
Yes, you can (using the formula given by others) roughly calculate the NUE. As said by Sunita Gaind and others not all of the N uptake by your crop will be coming from applied N (some from native soil N, organic matter, etc). Subtracting the value of unfertilized plot from the fertilized plot may help. Just that there is the likelihood for an interactive effect between N applied and native soil N uptake by the crops in the fertilized plots. .
The Recovery efficiency can be calculated from the data of N uptake and N applied.
Apparent recovery efficiency (RE) is the efficiency with which the crop utilizes the acquired N from the N applied and computed as follows.
ARE = ((N uptake in treated plot - N uptake in control plot)/quantity of N applied) x100
You may find the answer to your question from the attached publication of ours
Yes, you can calculate and use the following formula. You can also read this article. https://www.mdpi.com/2073-4395/9/10/651
NUE (%) = (N-uptake in fertilizer plot (kg/ha))‒N uptake in unfertilized plots (kg/ha))*100)/N-applied (kg/ha)
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