lot of work reported in this regard, wider range in efficiency values, depending upon the stresses arising due to other nutrients stresses as well stress due to other biotic as well abiotic factors,the interest is to collate and interpret the reasons for wider range, it may aid to understand the factors responsible for the lower values as well it will further aid in suggesting appropriate management options to enhance the nutrient uptake efficiencies of individual nutrients

the interest is to note work in this regard already done from the experienced researchers working on advanced crop nutrition solutions

regards

Interesting question Naveen . This is the most debated issue , but equally unsolved till date . The reasons behind is the multiple nature of the issue . NUE is said to be  predominantly physiological in nature under strict  genetic control  , especially when crops interact with climate. Find below one excellent PDF for further reading .  

Thanks for loading a nice paper,  we need these values for optimization of nutrients dose for a target yield of crop, we also realize the interaction behaviour may change the nutrients  response, or if fortified product is used then the efficiency may increase and dose may have to be reduced, but we have to go with some rference values of these efficiency factors

regards 

Please refer article published by Dr.S.L Partil,Agronomist  on chick pea from Central soil and water consrvation Inst,Bellary,Karnataka  in crop Science Joural

Naveen , I am enclosing altogether a different line of work dealing with orchard efficiency in perennial crops. Hope , you like it .

thanks anoop, for nice publication regards

I can suggest you some  of my recent articles that will be certainly of your interest:

Ceotto E., Castelli F., Moschella A., M. Diozzi, Di Candilo M. 2015. Cattle slurry fertilization to giant reed (Arundo donax L.): biomass yield and nitrogen use efficiency. BioEnergy Research, 8, 3, 1252-1262. DOI: 10.1007/s12155-015-9577-2.

Ceotto E., Castelli F., Moschella A., M. Diozzi, Di Candilo M., 2014. It is not worthwhile to fertilize sweet sorghum (Sorghum bicolor L. Moench) with cattle slurry. Productivity and nitrogen-use efficiency. Industrial Crops and Products, 62, 380–386. DOI:10.1016/j.indcrop.2014.09.009.

Ceotto E., Castelli F., Moschella A., Diozzi M., Di Candilo M., 2015. Nitrogen-use efficiency of poplar SRC fertilized with cattle slurry. 23rd European Biomass Conference and Exibition, 1-4 June; Vienna, Austria: 123-126. ISBN 978-88-89407-516. DOI 10.5071/23rdEUBCE2015-1CO.13.5 http://www.etaflorence.it/proceedings.

With my best regards

Enrico Ceotto

Enrico, thanks a lot I could download one of the link, remaining two coould not be, but still topics covered by you are really effective, thanks a lot again

regards

Dear Naveen, 

Have a look at the QUEFTS publications (do a google) on fertiliser response models - it's been done for several crops (incl. maize, rice, banana, coffee). More on crop response in this paper, particularly the interaction with micro-nutrients:

https://www.researchgate.net/publication/273957827_Integrated_soil_fertility_management_in_Sub-Saharan_Africa_unravelling_local_adaptation

I hope some of this is useful,

Piet

Article Integrated soil fertility management in Sub‐Saharan Africa: ...

 Thanks Piet, for nice publication, we too have worked on QUEFTS for fertilizer optimizations for NPK and rather the other nutrients we used to address outside of QUEFTS window for developing customized fet\tilizers for various crops

this tool is very useful and to be further modified to bring into other nutrients as S, micro-nutrients, i understand the programme becomes complex but we have to begin, IPNI with Wageningen group should take the lead in this regard

regards

Plant nutrients use efficiency is influenced by many factor. Sharing to you a review paper of biotic factor and its managements

Article An Overview on Various Weed Control Practices Affecting Crop Yield

May be the range will be very wide since there are several factors involved in these calculations. 

Dr.Kalra, an important topic for discussion again. In the recent past I raised questions on use efficiency of P, S and Zn.Other colleagues have raised questions on N.K use efficiency is much higher among the nutrients. In the recent past much emphasis is being given for breeding crop varieties for  efficient use of soil and also applied nutrients. Fertilizer or nutrient products are developed/being developed for efficient plant nutrition. Multi-nutrient and other efficiency enhancer products are being made available to farmers. As we know there is no substitute for good agronomy for increasing nutrient use efficiency. Even though there are several formulae to compute nutrient use efficiency, nutrient uptake efficiency and utilization of the nutrient taken up by crop to produce grain or other economic product is important. Consolidation and synthesis of Representative values for nutrient use efficiency for each crop/variety, in different soils under different good agromic practices. are needed. A good programming/software need to be developed for accommodating different products, practices and other situations. Number of interacting factors may be kept to minimum to avoid complication. We have done lot of work on nutrient use efficiency and published but consolidated and comprehensive information is limited.

Dr Subba Rao, I fully agree with you and we can think over this imp aspect of consolidation of efficiency range for crops/cropping system as far as different nutrients are concerned and moreover for different growing regions

regards

Here a paper on tomato with an estimate of N efficiency:

https://www.researchgate.net/publication/284458685_Effects_of_Nitrogen_Rates_on_Nitrogen_Phosphorous_and_Potassium_Partitioning_Accumulation_and_Use_Efficiency_in_Seepage-irrigated_Fresh_Market_Tomatoes

Article Effects of Nitrogen Rates on Nitrogen, Phosphorous, and Pota...