Relationships of leaf color chart and SPAD values to leaf N content of Jasmin rice in Northeast Thailand

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Relationships of leaf color chart and SPAD values to leaf N content of Jasmin rice in Northeast Thailand
Burac, Mary Ann; Boling, Anita; Tuong, To Phuc; Harnpichivitaya, D.; Rajatasereekul, S., 2013, "Relationships of leaf color chart and SPAD values to leaf N content of Jasmin rice in Northeast Thailand", https://doi.org/10.7910/DVN/XK5NOP, Harvard Dataverse, V2
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Description
Strong correlations among the leaf color chart (LCC), chlorophyll meter (SPAD) readings, and leaf N concentrations in modern rice varieties provide simple and economical methods for indirectly determining leaf N content. The LLC and SPAD have not been used widely with traditional varieties. This study aimed to determine whether the LCC and SPAD could be used to indicate the leaf N status of jasmine rice (KDML 105). Field experiments were conducted in June-November 2003 in farmers' fields in Kha Khom village, Ubon Ratchathani (UR), and in Chumpae Rice Experiment Station, Khon Kaen. Experimental treatments included four N levels (farmers’ practice, 0, 60, and 120 kg N per ha) in UR, and six N levels (0, 19, 38, 58, 75, and 113 kg N per ha) in Khon Kaen. For both sites, treatments were laid out in an RCBD with four replioations under well-watered conditions. LCC and SPAD measurements were taken on fully expanded leaves of 16 plants from maximum tillering to flowering stage. The same leaves were destructively taken to determine the leaf N content. Leaf N content was 1.7-3.5%, SPAD reading 26-43, and the LCC reading 1-4. Leaf N content was linearly related to SPAD (R2= 0.71-0.86, P is less than 0.01) and LCC readings (R2= 0.52-0.77, P is less than 0.01) and the slopes of regression lines differed among growth stages. For any given SPAD reading, KDML 105 had a lower leaf N content than modern varieties. SPAD and LCC readings estimated leaf N content of jasmine rice. The SPAD and LCC can be used for site-specific N management of jasmine rice in Northeast Thailand. (2005)
Keyword SPAD meter, grain yield, Thailand
Notes Subject: null Type: GRiSP Product Line Notes: 3.1.2;
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