Figure 7

Biplot of plant hormones content for each repetition (n = 4) in six types of composts, showing the first two principal components (PC1 and PC2) of the PCA model that together explain 96.9% of the total variance, i.e., 92.45% and 4.40% for PC1 and PC2, respectively. Blue biplot vectors indicate the strength and direction of factor loading for all analyzed variables: 1, ABA; 2, IAA; 3, IBA; 4, IPA; 5, PAA; 6, BL; 7, HBL; 8, epiBL; 9, norBL; 10, epiCS; 11, CT; 12, 6dTY; 13, cZ; 14, cZR; 15, cZ9G; 16, cZOGR; 17, tZ; 18, tZR; 19, tZOG; 20, tZOGR; 21, tZ9G; 22, DHZ; 23, DHZR; 24, DHZOG; 25, DHZOGR; 26, DHZ7G; 27, DHZ9G; 28, IP; 29, IPR7G; 30, oT; 31, mT; 32, pT; 33, BA; 34, GA₃; 35, SA. Composts are marked in red: BE, biohumus extract; CHCAP, compost hemp chaff and apple pomace; GC, garden compost; OC, organic compost; OC-P, organic compost-pellets; CBH, compost with buckwheat husk.