Improvement of nitrogen management in rice paddy fields using chlorophyll meter (SPAD)
By M. Esfahani, H. Abbasi, B. Rabiei, M. Kavousi. Paddy and Water Environment, 2008
90 citations recorded by the source corpus.
Optimum rate and timing application of nitrogen (N) fertilizer are most crucial in achieving high yield in irrigated lowland rice. In order to assess leaf N status, a semidwarf rice cultivar (Khazar) was grown with different N application treatments (0, 40, 80, and 120 kg N ha−1 splited at transplanting, midtillering, and panicle initiation stages) in a sandy soil in Guilan Province, Iran, in 2003. The chlorophyll meter (SPAD 502) readings were recorded and leaf N concentrations were measured on the uppermost fully expanded leaf in rice plants at 10-day internals from 19 days after transplanting to grain maturity. Regression analysis showed that the SPAD readings predicted only 23% of changes in the leaf N concentration based on pooled data of leaf dry weight (Ndw) for all growth stages. However, adjusting the SPAD readings for specific leaf weight (SPAD/SLW) improved the estimation of Ndw, up to 88%. Specific leaf weight (SLW), SPAD readings, leaf area and weight as independent variables in a multiple regression analysis predicted 96% of the Ndw changes, while SPAD readings independently predicted about 80% of leaf N concentration changes on the basis of leaf area (Na). It seems that chlorophyll meter provides a simple, rapid, and nondestructive method to estimate the leaf N concentration based on leaf area, and could be reliably exploited to predict the exact N fertilizer topdressing in rice.
Subfields: Ecology, Plant Science
View Paper: https://www.semanticscholar.org/paper/3aefe944bea3ec146814cadf6e67155e84692bb7
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In Plant Science
Citations in the corpus
- SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status (2014, background): “(Hoel and Solhaug, 1998; Thiyagarajan, 2000; Peng et al., 2006; Esfahani et al., 2008; Huang et al., 2008; Li et al., 2011).”
- Need based nitrogen management using the chlorophyll meter and leaf colour chart in rice and wheat in South Asia: a review (2010, background): “Yang et al. (2003), Shukla et al. (2004) and Esfahani et al. (2008) found that adjusting the SPAD or LCC readings for specific leaf weight (SPAD or LCC/ SLW) improved the estimation of plant N accumulation over N content on dry weight basis, confirming the importance of leaf thickness in measuring…”