Effect of Phosphorus Fertilizer Rate on Seedcotton Yield and Petiole Phosphorus Concentrations
نویسندگان
چکیده
monly used instruments is a Minolta SPAD (soil plant analysis development) meter. The SPAD meter measures the difference in light absorption at 430 and 750 nm (Wood et al., 1992). The former is the transmittance peak for chlorophyl ‘a’ and ‘b’, and the latter is in the near-infrared region. The instrument converts the difference in light absorption at these two wavelengths into a numerical SPAD value ranging from 0 to 80 as an index of plant chlorophyl content. The objectives of this replicated field experiment were to evaluate the effect of P fertilization and cotton cultivar on seedcotton yield and evaluate the effect of P fertilization on plant stress as indicated by leaf fluorescence and chlorophyl content. The outcomes of the research will be used to improve the accuracy of our P-fertilizer recommendations for cotton grown in Arkansas.
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