Search Results

You are looking at 81 - 90 of 244 items for :

  • SPAD readings x
  • Refine by Access: All x
Clear All
Free access

Yung-Liang Peng, Fang-Yin Liu, Rong-Show Shen, and Yu-Sen Chang

readings, averaged from measurements at six locations on each leaf, were obtained with a chlorophyll meter (SPAD-502; Minolta, Osaka, Japan). Leaf chlorophyll a and chlorophyll b weremeasured spectrophotometrically in the laboratory in 80% acetone

Full access

Jason J. Danaher, Jeremy M. Pickens, Jeffrey L. Sibley, Jesse A. Chappell, Terrill R. Hanson, and Claude E. Boyd

dewatered aquaculture effluent (AE) from a freshwater nile tilapia production system at 0, 16, and 36 d after planting (DAP) and SPAD readings at 36 DAP. The experiment was performed in a gutter-connected, twin-wall polycarbonate greenhouse at the Paterson

Open access

Barbara J. Smith, Amir Rezazadeh, Eric T. Stafne, and Hamidou F. Sakhanokho

red LED and combination LED treatments had the lowest SPAD readings. In both trials, SPAD readings varied among cultivars at each evaluation ( Table 3 ). In Trial 1, the relative chlorophyll content of ‘Pelican’ was lower than that of ‘Sweet Charlie

Free access

Chang-Tsern Chen, Ching-Lung Lee, and Der-Ming Yeh

Complete nutrient solution (control). Eustoma plants with the complete nutrient solution had maximum growth as measured by plant height, node number, total leaf area, SPAD-502 reading, and plant dry weights ( Tables 2 and 3 ). Plants grew well and

Free access

Youping Sun and Alyssa Lanae Palmer

damage ( Sun et al., 2015 ). The foliar salt damage rating did not consider plant size. Chlorophyll content. Relative chlorophyll content [Soil-Plant Analysis Development (SPAD) reading] was measured using a handheld chlorophyll meter (SPAD 502 Plus

Full access

Giorgio Gianquinto, Francesco Orsini, Paolo Sambo, and Matilde Paino D'Urzo

provided with a photometer to obtain an indication of the chlorophyll content of the leaf. Readings are collected from a sample of several leaves. These tools are mainly represented by the SPAD 502 CM (Minolta, Osaka, Japan), the N-tester (Yara

Free access

Gitta Shurberg, Amy L. Shober, Christine Wiese, Geoffrey Denny, Gary W. Knox, Kimberly A. Moore, and Mihai C. Giurcanu

content (SPAD) was estimated every 6 weeks using a portable chlorophyll meter (SPAD-502; Minolta Corp., Ramsey, NJ). Six readings were taken per plant cluster (two readings per plant) and averaged. Fisher et al. (2003) reported that SPAD is an indirect

Free access

Guihong Bi, William B. Evans, James M. Spiers, and Anthony L. Witcher

., Ramsey, NJ). For each plant, three recently fully expanded leaves were randomly chosen for SPAD measurement and the average of the three readings was recorded. Plant growth index [(height + widest width + perpendicular width) ÷ 3] and number of fully open

Free access

Ertan Yildirim, Huseyin Karlidag, Metin Turan, Atilla Dursun, and Fahrettin Goktepe

oven at 70 °C until a constant mass was reached. Chlorophyll readings. A portable chlorophyll meter (SPAD-502; Konica Minolta Sensing, Inc., Japan) was used to measure leaf greenness. SPAD-502 chlorophyll meter estimates total chlorophyll amounts in

Full access

Gitta Shurberg, Amy L. Shober, Christine Wiese, Geoffrey Denny, Gary W. Knox, Kimberly A. Moore, and Mihai C. Giurcanu

chlorophyll content (SPAD). A portable chlorophyll meter (SPAD-502; Minolta Corp., Ramsey, NJ) was used to estimate plant chlorophyll content every 6 weeks for bush daisy, lantana, salvia, and liriope. Six SPAD readings (unitless) were taken on mature leaves