A variety of plant parts-based ( Leaf analysis, Flower analysis, Fruit analysis, Sap analysis etc. ) nutrient constraint diagnostic  methods are practiced in identifying the type of nutrient constraints and subsequent fertilizer recommendation with distinct advantages and disadvantages associated with each one of them. historically , leaf analysis is by far the best method of nutrient constraint diagnosis with a distinct disadvantage of not being able to apply the recommendation   within the same cropping season , and more so ,the method is lAb-based to field-based. In the past , there has been limited efforts to develop nutrient diagnostic criteria with aim to have better field application , regardless of annual or perennial crops. I have the following set of questions to my learned colleagues  pertaining to above issue:

*  Whether  sap analysis is more prognostic than diagnostic in nature and vice-versa in nature?. 

* To what an extent , sap  analysis would be able to reveal the nutrient constraints when it comes to field application for diagnosis?. 

* Is there any comprehensive sap analysis protocol covering majority of   nutrients ?

* Which kind of crops benefit more from sap  analysis-based nutrient constraint diagnosis ?

* What is the future prospects of of sap  analysis compared to other plant parts-based diagnosis?.

Wishing my all  learned RG members a VERY HAPPY and PROSPEROUS 2016.

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