Spur light exposure as a primary external cause for derivation of dris norms in walnut trees

Klein, I.; Weinbaum, Steven A.; DeJong, Theodore M.; Muraoka, T.

doi:10.1080/01904169109364217

Cited by 4 publications

(8 citation statements)

References 29 publications

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“…results have been found in prunes (Weinbaum et al, 1989) and Walnuts (Klein et al, 1991c) and it may be universally true for all plants. Using the appropriate expression ( % D W or ixg mm-2), the mineral content and ratios in leaves within the canopy could be described by a single curve, regardless of shoot type.…”

Section: Light Is a Primary Determinant Of Fruitfulness (Klein Et Almentioning

confidence: 57%

“…The modified DRIS analysis of persimmon from mid-shoot leaves of the current year growth was essentially similar to that of walnut spur leaves (Klein et al, 1991c), with two minor exceptions; a. The correlation values of P to SLW were considerably lower in persimmon as compared to walnut (0.267 vs 0.654 and 0.684 in two walnut cultivars, respectively.…”

Section: Light Is a Primary Determinant Of Fruitfulness (Klein Et Almentioning

confidence: 59%

“…A balanced calculation of the DRIS procedure was used, as described in detail previously (Klein et al, 1991c). The mineral content of leaves with a SLW range of 15.0 ---0.3 mg cm-2 was used to derive the x/y (x and y representing various elements) and CV values for the norms of persimmon.…”

Section: Methodsmentioning

confidence: 99%

“…The procedure for walnut was calibrated directly to the productivity of spurs as influenced by light exposure, and took into account in each mineral ratio (either in numerator or denumerator) the DW component (%DW) and the effect of light (Ixg mm-2). The macroelement mineral profile of walnut spur leaves was shown to be imbalanced at decreasing light exposures (Klein et al, 1991c), concomitantly with a decline in spur productivity (Klein et al, 1991a).…”

Section: Introductionmentioning

confidence: 99%

“…A modification of the DRIS procedure was proposed by Klein et al, (1991c) for walnut spur leaves taking into account the effect of light on the leaf mineral profile, as a primary deter-minant. In this modification a mixed expression of mineral content ( % D W and ~g mm-2), highly correlative to photosynthetic photon flux (PPF) and SLW were utilized in the calculation.…”

Section: Introductionmentioning

confidence: 99%

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DRIS evaluation of persimmon (Diospyrus kaki L.)

1993

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The leaf macroelement profile of fruiting shoots of persimmon was characterized by a modified diagnostic and recommendation integrated system (DRIS), using SLW as a primary determinant of leaf mineral content. Leaf N, P, Ca, and Mg content was positively and linearly correlated with SLW when expressed on leaf area basis (p~g mm-2). Potassium had a negative and higher correlation to SLW when expressed on %DW basis. Mineral ratios relevant for the DRIS analysis were calculated using all four possible combinations of Area (A) and Weight (W) expressions (A/A, A/W, W/A and W/W) and correlated with leaf SLW. The particular expressions chosen for the DRIS analysis were based on their highest correlation to SLW and included N/K, P/K and Ca/Mg, based on the A / W expression of the respective nutrients and the reciprocal expression (W/A) for all other ratios. Derivation of DRIS norms were based on the mineral profile of highly exposed shoots (SLW of 15.0 + 0.3 mg cm-2). Calculated indices of gradually less exposed shoots (SLW of 3.8-18.9 mg cm -2) revealed a strong exponential imbalance of N, K and P (increasingly positive) vs Ca and Mg (increasingly negative). The calculated Nutritional Imbalance Index (NII) value of leaves decreased exponentially as shoot leaf SLW decreased. The modified DRIS analysis detected successfully a distinct mineral profile of highly vigorous fruiting 'water shoots', as compared to regular fruiting shoots of comparable SLW.

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Section: Light Is a Primary Determinant Of Fruitfulness (Klein Et Almentioning

confidence: 57%

Section: Light Is a Primary Determinant Of Fruitfulness (Klein Et Almentioning

confidence: 59%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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