Use of substrates and hydrogel to produce desert rose seedlings

Abstract

Adenium obesum (Forssk.) Roem. & Schult., widely known as desert rose, has attracted interest for its esthetic characteristics, which are influenced by the process of seedling production. Using two consecutive experiments installed fully at random, the study aimed at assessing the use of different substrates and hydrogel to produce desert rose seedlings in a protected environment. First, eleven substrates were tested, prepared as follows: OrganoAmazon®; PuroHumus®; soil; rice husk in natura; carbonized rice husk, sawdust and cattle manure. Then, three substrates were tested (S1 - OrganoAmazon® + PuroHumus®; S2 - OrganoAmazon® + PuroHumus® + rice husk in natura and S3 - OrganoAmazon® + PuroHumus® + carbonized rice husk) associated to four hydrogel levels: 0 (daily irrigation), 1, 2 and 3 g L−1 (irrigated on alternate days). Growth variables and quality index of seedlings were assessed. Six substrates (all of them without addition of sawdust and where used in mix) were grouped as those the promoted appropriate growth of seedlings, with height, number of leaves, collar diameter, root length and aerial part biomass superior to 6.5 cm; 13; 12 mm; 7.5 cm and 0.45 g, respectively. The substrate composed of OrganoAmazon® + PuroHumus® (1:1 v/v), when irrigated daily, was the one that favored most the production of quality seedlings. The use of hydrogel in substrates with shifts of irrigation on alternate days did not favor the production of desert rose seedlings.

Condições de cultivo e substratos para produção de mudas de couve-manteiga em clima Tropical

“…The physicochemical characteristics of the substrate made with OrganoAmazon® + PuroHumus® (S2) were effective in the development of the collard green seedlings, mainly due to the nutritional increase provided by PuroHumus®, since OrganoAmazon® did not have good nutritional conditions (Table 1). Therefore, the results of the present study reinforce the efficiency of this combination in the production of seedlings of vegetable and ornamental species since this substrate was the most efficient in the production of seedlings of pepper (Monteiro et al, 2016), tomato (Monteiro et al, 2018, desert rose (Monteiro et al, 2019), Brazilian chili pepper (Monteiro et al, 2022) and now collard greens.…”

Substratos e hidrogel agrícola na produção de mudas de pimentão nas condições de Savana de Roraima

“…FV GL Conforme Gomes et al (2002), essa relação é determinante na estimativa de sobrevivência das mudas no transplantio, em que, quanto maior o valor de DC em relação à altura, maiores as chances de sobrevivência de mudas em campo, ou seja, os menores valores de relação Altura/DC indicam melhores condições de desenvolvimento das plantas. Assim como neste trabalho, o IQD tem sido utilizado para expressar a qualidade de mudas em vários seguimentos da agricultura (COSTA et al, 2011;Monteiro Neto et al, 2019;Monteiro Neto et al, 2020). Provavelmente, o fornecimento diário de água foi determinante para o melhor desenvolvimento das mudas submetidas à irrigação diária.…”

PRODUCTION OF Adenium obesum (FORSSK.) ROEM. & SCHULT SEEDLINGS IN DIFFERENT SUBSTRATES

“…The development of ornamental plants requires a substrate that meets the demands of the crop. It is therefore important to conduct studies to develop cost effective substrates for desert rose production (Monteiro Neto et al, 2019), such as fishfarm sludge, pine bark, and tobacco.…”