Majidi, A. (2014). Use of Minolta SPAD-502 Chlorophyll Meter for Estimating Leaf N Concentration and Grain Protein Content in Three Varieties of Wheat. , 28(2), 245-254. doi: 10.22092/ijsr.2014.120333
A. Majidi. "Use of Minolta SPAD-502 Chlorophyll Meter for Estimating Leaf N Concentration and Grain Protein Content in Three Varieties of Wheat". , 28, 2, 2014, 245-254. doi: 10.22092/ijsr.2014.120333
Majidi, A. (2014). 'Use of Minolta SPAD-502 Chlorophyll Meter for Estimating Leaf N Concentration and Grain Protein Content in Three Varieties of Wheat', , 28(2), pp. 245-254. doi: 10.22092/ijsr.2014.120333
Majidi, A. Use of Minolta SPAD-502 Chlorophyll Meter for Estimating Leaf N Concentration and Grain Protein Content in Three Varieties of Wheat. , 2014; 28(2): 245-254. doi: 10.22092/ijsr.2014.120333

Use of Minolta SPAD-502 Chlorophyll Meter for Estimating Leaf N Concentration and Grain Protein Content in Three Varieties of Wheat

پژوهش های خاک
Article 1, Volume 28, Issue 2, October 2014, Pages 245-254    PDF (329.54 K)
Document Type: Research Paper
DOI: 10.22092/ijsr.2014.120333
Author
A. Majidi*
Assistant professor, Agricultural and Natural Resource Research Center of West Azerbaijan
Abstract
Non-destructive approaches that can rapidly estimate the nitrogen (N) status of plant could be useful in N fertilizer management practices.  This study was conducted to assess leaf N concentration and grain protein content of three varieties of winter wheat (Triticum aestivum L., cv. Zarin, Alvand, Durum) using portable non-destructive Minolta SPAD-502 chlorophyll meter. Measurements were made on the midpoint of the last fully developed leaf at Zadoks growth stages GS 31 and GS 41 collected from an irrigated wheat N response trial in a factorial randomized complete block design with three varieties and six N treatments in three seasons (2008-2010). The chlorophyll meter distinguished grain yield differences between N fertilizer treatments at both growth stages GS 31 and GS 41. Significant differences in chlorophyll meter readings were found between winter wheat cultivars. Chlorophyll meter SPAD-502 readings gave a poor prediction of grain yield (R2, 0.01-0.06), but it predicted successfully the nitrogen status of total leaf N content (0.63**>R2>0.88**). Significant regression equations were established between grain protein content and SPAD value for all varieties studied in this experiment (0.40**>R2>0.79**). The best correlation between the SPAD meter readings with foliar N concentrations and grain protein contents were obtained at GS 41. The results indicate that SPAD meter can be a useful tool for nondestructively assessing foliar N status of winter wheat to make N recommendations and protein content in grain, but SPAD readings should be calibrated for wheat dominant varieties cultivated in west Azerbaijan regions.
Keywords
Nitrogen; Chlorophyll index; Growth stages; Winter wheat
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