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The Effect of Nitrogen and Phosphorus Ratios and Electrical Conductivity on Plant Growth

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Table 1. Ionic composition of NO3−NH+4 , NO3− /P and NH4+ /P ratios (mM/mM) adjusted from a modified 1/2 strength Hoagland’s solution, all with an EC of ~1.2 dS∙m−1
Table 3. Marigold height (cm) and shoot dry weight (g) at flowering (Spring, 2010) in nutrient solutions with varying NO3−/P ratios (mM/mM) at an EC of ~1.2 dS∙m−1
Table 4. Sunflower height (cm) at flowering (Spring and Summer, 2012) in nutrient solutions with varying NH+4 /P ratios (mM/mM) at ECs of 0.6, 1.2, 2.2 and 4.0 dS∙cm−1
Figure 3. The effect of NO3− /P ratio (mM/mM) of nutrient solutions on shoot dry weight (g) using EC’s of 0.6 and 1.2 dS∙m−1 for marigold (A—R2 = 0.62) and sunflower (A—R2 = 0.24); or height (g) using an EC of 0.6 dS∙m−1 for sunflower (B—R2 = 0.30); or sho
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