SOURSOP SEEDLINGS: EMERGENCE AND DEVELOPMENT UNDER DIFFERENT CULTIVATION ENVIRONMENTS AND SUBSTRATES - PART I

Seedling quality is crucial to obtain vigorous plants in the field. This study aims to evaluate the emergence and development of soursop seedlings in different substrates in protected environments. The experiment was conducted at the Mato Grosso do Sul State University and carried out using five protected environments: greenhouse, greenhouse with thermo-reflective screen, nursery with monofilament screen, nursery with thermo-reflective screen, and nursery with palm thatch. The substrates (S) consisted of cattle manure (M), humus (H), cassava branches (C), and vermiculite (V) as in the following ratios: S1 = H + V (1: 3), S2 = H + V (1: 1), S3 = H + V (3: 1), S4 = H + C (1: 3), S5 = H + C (1: 1), S6 = H + C (3: 1), S7 = M + V (1: 3), S8 = M + V (1: 1), S9 = M + V (3: 1), S10 = M + C (1: 3), S11 = M + C (1: 1), S12 = M + C (3: 1), S13 = H + M + V (1: 1: 1), S14 = H + M + C (1: 1: 1), and S15 = H + M + V + C (1: 1: 1: 1). For the statistical analysis, each of those environments was considered as an experiment in which was used the completely randomized design; subsequently, it was performed a combined analysis of them. In summary, the greenhouse with thermo-reflective screen and combined substrates with "M + V" promote greater development of the seedlings. High concentrations of "V" or "C" cause no beneficial effect on soursop seedlings.