Abstract
Abstract Five hundred leaf analyses of sweet cherry and hazelnut leaves were evaluated to determine if biases in DRIS formulas could prevent the detection of some deficiencies or excesses. Both one‐equation and two‐equation calculation procedures were evaluated. The one‐equation approach has several disadvantages. The data imply that there are limits on minimum or maximum values that an index can obtain for some elements, but not for others. The range of index values obtainable varies considerably among elements. If the sum of DRIS indices, regardless of sign, is used as a criterion to identify imbalances, relative deficiencies or excesses for some elements are masked. These difficulties are lessened but not entirely eliminated with the original two‐equation procedure. Regardless of the calculation procedure the relationship between DRIS indices and the respective concentrations varied for the elements N, K, P, Ca, Mg, Mn, Fe, Cu, B, and Zn. Some indices are so dependent on the concentration of the element involved that a ratio based diagnosis would have little advantage over a sufficiency range diagnosis. Other elements have indices that are so dependent on the concentrations of other elements that the index is of little use in evaluating nutritional status. Although DRIS is a very useful diagnostic approach, it will not detect all deficiencies or excesses. DRIS serves best as a supplement to sufficiency range based interpretation; providing additional information when severe imbalances exist.
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Claims 9
Claim · model-written summary
One-equation DRIS indices had element-specific minimum or maximum limits.
Verbatim
e0“The data imply that there are limits on minimum or maximum values that an index can obtain for some elements, but not for others”
t0“sweet cherry and hazelnut”
Claim · model-written summary
The possible range of DRIS index values varied considerably among elements.
Verbatim
e0“The range of index values obtainable varies considerably among elements”
t0“sweet cherry and hazelnut”
Claim · model-written summary
Using the unsigned sum of DRIS indices masked some relative deficiencies or excesses.
Verbatim
e0“If the sum of DRIS indices, regardless of sign, is used as a criterion to identify imbalances, relative deficiencies or excesses for some elements are masked”
t0“sweet cherry and hazelnut”
Claim · model-written summary
The two-equation procedure lessened but did not eliminate those diagnostic problems.
Verbatim
e0“These difficulties are lessened but not entirely eliminated with the original two‐equation procedure”
t0“sweet cherry and hazelnut”
Claim · model-written summary
Relations between DRIS indices and concentrations differed across N, K, P, Ca, Mg, Mn, Fe, Cu, B and Zn regardless of calculation method.
Verbatim
e0“Regardless of the calculation procedure the relationship between DRIS indices and the respective concentrations varied for the elements N, K, P, Ca, Mg, Mn, Fe, Cu, B, and Zn”
t0“sweet cherry and hazelnut”
Claim · model-written summary
Some DRIS indices depended so strongly on their own element concentration that ratio diagnosis offered little advantage over sufficiency-range diagnosis.
Verbatim
e0“Some indices are so dependent on the concentration of the element involved that a ratio based diagnosis would have little advantage over a sufficiency range diagnosis”
t0“sweet cherry and hazelnut”
Claim · model-written summary
Other DRIS indices depended on concentrations of other elements enough to be of little use for nutritional evaluation.
Verbatim
e0“Other elements have indices that are so dependent on the concentrations of other elements that the index is of little use in evaluating nutritional status”
t0“sweet cherry and hazelnut”
Claim · model-written summary
DRIS did not detect every deficiency or excess.
Not reportedComparatorValue
Verbatim
e0“it will not detect all deficiencies or excesses”
t0“sweet cherry and hazelnut”
Claim · model-written summary
The authors recommended DRIS as a supplement to sufficiency-range interpretation when severe imbalances exist.
Verbatim
e0“DRIS serves best as a supplement to sufficiency range based interpretation; providing additional information when severe imbalances exist”
t0“sweet cherry and hazelnut”