TY - JOUR AU - Cruz, Gustavo Henrique Miguel da AU - Cunha, Fernando França da AU - Souza, Epitácio José de AU - Silva, Andrisley Joaquim da AU - Filgueiras, Roberto PY - 2020/11/26 Y2 - 2024/03/29 TI - Irrigation frequencies for Eucalyptus grandis seedlings JF - Revista Engenharia na Agricultura - REVENG JA - Reveng VL - 28 IS - Contínua SE - Recursos Hídricos e Ambientais DO - 10.13083/reveng.v29i1.9669 UR - https://periodicos.ufv.br/reveng/article/view/9669 SP - 364-374 AB - <p>One of the bottlenecks in relation to the production of forest seedlings is irrigation, especially in lower-tech nurseries. The small volumes of substrate, where the seedlings develop, lead to low water storage. This can cause water deficit and significant losses in seedlings production, even leading to plant mortality. The objective of this study was to determine the best irrigation frequencies for Eucalyptus grandis seedling production in lower-tech nurseries. The experiment was conducted between 04/08/2013 and 07/23/2013 (106 days) in Chapadão do Sul, Mato Grosso do Sul, Brazil. The experiment was installed in a split plot scheme, with the irrigation frequencies in the plots and seven evaluations (15, 30, 45, 61, 76, 91 and 106 days after sowing) in the subplots, in a randomized complete block design, with five replicates. Four irrigation frequencies were tested: IF1 (one daily irrigation - 11:00 a.m.), IF2 (two daily irrigations - 11:00 a.m. and 7:00 p.m.), IF3 (three daily irrigations - 07:00 a.m., 11:00 a.m. and 7:00 p.m.) and IF4 (four daily irrigations - 07:00 a.m., 11:00 a.m., 3:00 p.m. and 7:00 p.m.). The sample units were composed of eight seedlings in 50 cm3 containers with conical shape, filled with soil and vermiculite in a volume ratio of 1:1. The irrigation depth was estimated by reference evapotranspiration (Penman-Monteith) multiplied by a crop coefficient equal to two. Plant height, number of true leaves, shoot dry mass, root dry mass, total dry mass, seedling quality index, survival and water use efficiency of Eucalyptus grandis seedlings were evaluated. The average daily irrigation depth in the experimental period was 5.2 mm. Based on the results, for Eucalyptus grandis seedling producers, in lower-tech nursery, irrigation management with twice-a-day frequency (11:00 a.m. and 7:00 p.m.) is recommended.</p> ER -