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readings from the fully expanded leaves. Twenty leaves per experimental unit were randomly measured and averaged to a single SPAD value for each treatment. On the same date, the chlorophyll fluorescence was recorded on 15 min dark-adapted leaves on six

trees exhibiting the most severe N deficiency symptoms (SPAD readings 26.4 to 31.4) classified as low N, the five trees exhibiting moderate N deficiency symptom severity (SPAD 33.6 to 37.2) classified as medium N, and the five trees exhibiting the least

meter (LI-COR ® Biosciences, Lincoln, NE). Shoot DW was determined after oven-drying at 70 °C for 4 d. Leaf relative chlorophyll content. Relative chlorophyll content [soil plant analysis development (SPAD) reading] was recorded using a handheld

is less than one copy per sample analyzed). Regressions of SPAD readings vs. CLas Ct in Nov. 2012 were conducted using Excel (Microsoft, Redmond, WA). Results and Discussion Development of CLas titer. The main effect of genotype, averaged across all

-COR ® Biosciences, Lincoln, NE). Shoot DW was determined after shoots were oven-dried at 65 °C to constant weight. Gas exchange and SPAD reading. Gas exchange and relative chlorophyll content were measured for broccoli ‘Packman’ hybrid, eggplant ‘Amadeo’ hydrid

(grams) was determined. Leaf relative chlorophyll content. Relative chlorophyll content [soil–plant analysis development (SPAD) reading] was measured using a hand-held chlorophyll meter (SPAD-502 Plus; Minolta Camera Co., Osaka, Japan) 1 week before

Distortion of the SPAD-502 chlorophyll meter readings by changes in irradiance and leaf water status Agronomie 24 1 41 46 Mcartney, S. Belton, R. 1992 Apple shoot growth and cropping responses to root pruning N. Z. J. Crop Hort. Sci. 20 383 390 McFayden, L

irrigation frequency. This was related to higher canopy temperature causing chlorophyll degradation in dry conditions, and thus leading to greater reflectance and greater SPAD readings. Additionally, SPAD measurements were positively correlated with

. No flowers were observed in A. barnebyi and C. fruticosa during the experimental period. Clematis fruticosa and E. septentrionale had no significant reduction in SPAD readings with increasing EC levels. Vertical bars represent standard errors

for each plant. Table 3. Means and analysis of variance for SPAD chlorophyll value and dry weight of ‘M402’ ornamental pepper as influenced by main effects of pinching (P) and paclobutrazol (PB) treatments. SPAD values are averages of three readings