Abstract

This study aimed to evaluate the growth of Raphanus sativus L. under six phosphorus doses in combination with three strains of Trichoderma spp. The design was a randomized block design with seven replications in a factorial scheme, 4 x 5 (treatments and doses). Treatments related to Trichoderma spp. were T₁ – control, without application of T. harzianum strain; T₂ – T. harzianum ESALQ 1306, T₃ – T. harzianum IBLF 006 WP, and T₄ – T. asperellum URM 5911, at doses of 0, 40, 80, 120, 160, and 200 kg ha^-1 of P₂O₅, in a greenhouse. The evaluated characteristics were tuberous root diameter (RDI), tuberous root length (RLE), relative chlorophyll index (RCI), leaf dry mass (LDM), tuberous root fresh mass (FTRM), and tuberous root dry mass (TRDM). It was observed that there was a significant difference for the different sources of variation evaluated, indicating an interaction between the different isolates and doses. It is concluded that the application of Trichoderma harzianum - ESALQ 1306 strain is recommended for radish cultivation, with increases of 13% for tuberous root length, 7% for relative chlorophyll index, 23% for leaf dry mass, 35% for tuberous root fresh mass, and 12% for tuberous root dry mass compared to the control, at a dose of 104 kg ha^-1 of P₂O₅, with the possibility of dose reduction and more sustainable management. Additionally, strains T. harzianum IBLF 006 WP (T₃) and T. asperellum URM 5911 (T₄) are not recommended for radish cultivation.

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