Influence of biotic and abiotic factors on the survival of a eucalyptus due to soil and nursery management

This work aims to evaluate the influence of the biotic and abiotic factors on the survival of Eucalyptus grandis x Eucalyptus urophylla clones due to nursery management and soil. The seedling production was carried out in different substrata and during hardening, with different underwater managements: F1 – irrigated once a day, F2 – irrigated twice a day, F3 – irrigated three times a day, F4 – irrigated four times a day, and FD – continuously irrigated, until planting at 90 days after mass propagation in two soils, one sandy and another of clay texture. Biotical (pests and diseases) and abiotical (tending of stands) factors, possibly affecting the survival of seedlings were determined at both planting sites through census, 15 and 30 days after planting. The results indicated that the factors tested were less influenced by nursery water management and more in general by both soil and substratum, except for the factor of water stress that was affected by the substratum alone. The seedlings in the carbonized rice husk and vermiculite substrate were more susceptical to water stress than the Plantmax estacas® in clay soil at 15 days after the planting. However, the water stress and the damage caused by ants indicated the need to repeat the planting in both places.