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Intelligent tutoring systems 9 Soil respiration 6 Temperature 4
Water stress 4 alkaloid 4 phytohormone 4
soil water content 4 Soil temperature 3 greenhouse gasses 3
soil nutrient 3 Allelopathy 2 Competition 2
Cumulants 2 Litter fall 2 facula 2
flavone 2 fungus 2 relative water content 2
ACC 1 Blastophaga 1