Suppose their are different fertigation levels 50% RDF, 75% RDF, 100% RDF and 125% RDF
Fertilizer use efficiency for 50% was 115 kg/kg NPK, for 75% 102 kg/kg NPK, for 100% 95 kg/ kg NPK and for 125% 85 kg/kg NPK
In your case, the FUE for 50% RDF (Recommended Dose of Fertilizer) was highest at 115 kg/kg NPK, and it decreased as the RDF increased. This suggests that at lower fertilizer levels, the plants were able to utilize a greater proportion of the applied nutrients, resulting in higher FUE. Conversely, at higher fertilizer levels, a larger proportion of the applied nutrients were likely lost or remained unabsorbed, resulting in lower FUE.
It’s important to note that while reducing fertilizer levels can increase FUE, it’s crucial to ensure that the plants are still receiving adequate nutrition for optimal growth. Balancing these factors is key to sustainable and efficient agricultural practices.
I would add that foliar analysis is the key to assessing the balance recommended by Raghad
It is not an obvious thing that only by decreasing the level of fertilizer you will get higher FUE. As crop yield/amount of fertilizer represents FUE, generally it is clear that by dividing a higher value by a lower value you will get higher result. Suppose, you got 1150 kg crop by using 10 kg NPK. So, the FUE will be 115 kg/kg. Eventually by the increament of the amount of fertilizer the FUE will be reduced. So, the main concern is to get higher yield with minimum use of fertilizer.
Another thing I want to mention, is the "law of maximum" by Andre Voisin. That is "Excess of an available element in the soil reduces the effectiveness of other elements and consequently lowers the harvest yield obtained". This is another reason thats why you are getting this vice-versa result.
The efficiency of fertilizers increases when the soil is rich in decomposing organisms present in the soil, and its efficiency also increases whenever the fertilizers are natural from household waste to preserve the environment, increase food security, reduce waste in the use of chemical fertilizers, and primarily to preserve human health.
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