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The analysis of photosynthetic activity ofHelianthus tuberosusleaves was based on thefield experiment carried out in 2003-2005 in The Experimental Station in Parczew on good ryecomplex soil. The experiment was performed by means of randomized sub-blocks in 3 replications,including factors: the 1st order - varieties(Albik and Rubik), and the 2nd order – mineral fertilizationat rates of: N₀P₀K₀, N₀P₄₄K₁₂₅;...
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