Salt Stress and Ambience on the Production of Watermelon Seedlings

Abstract

<jats:p>ABSTRACT The objective of this study was to evaluate the production of watermelon seedlings irrigated with saline waters and cultivated in different types of environments and substrates. The experimental design was completely randomized with split-split plots, in which the plot corresponded to two growing environments (EN1 = full sun and EN2 = 50% shade black net), the subplot to two types of irrigation water (IW1 = 0.8 and IW2 = 2.5 dS m-1) and the sub-subplot to four types of substrates (SB1 = vermiculite + coconut fiber, SB2 = manure + soil, SB3 = carbonized rice husk + soil, SB4 = biochar + soil), with four replicates of twenty-five seeds. The variables analyzed were: emergence percentage (EP), emergence speed index (ESI), mean time of emergence (MTE), number of leaves (NL), stem diameter (SD), seedling height (SH) and root length (RL), shoot dry mass (SDM), root dry mass (RDM) and total dry mass (TDM). The EN2 treatment provided better conditions for emergence and initial growth, and EN1 was also favorable to the emergence and initial growth of watermelon seedlings, when the substrates SB1 and SB2 were used.</jats:p>

Coconut fiber biochar alters physical and chemical properties in sandy soils

“…This material is discarded in landfills and dumping grounds, acting, similar to all organic matter, as a potential gas emitter; furthermore, such material contributes to a reduction of the useful life of these deposits, proliferation of the foci of disease-transmitting vectors, foul odors, possible contamination of soil and water bodies, and the inevitable destruction of the urban landscape. From this perspective, several works have aimed to use coconut fruit residues in agriculture as a substrate source for seedling production (Silva Junior, Sousa, Sousa, Lessa, & Silva, 2020;Putrino, Tedesco, Bodini, & Oliveira, 2020) and for the production of biochar (Liu & Balasubramanian, 2014).…”

Crescimento inicial de minimelancia cv. Sugar Baby irrigada com águas salobras

“…Contudo, quando as sementes são submetidas à salinidade, o excesso de sais afeta a capacidade de absorção de água, que induz alterações bioquímicas e osmóticas na germinação e, consequentemente na emergência das plântulas (NÓBREGA et al, 2020) e na produção de massa seca das mudas de melancia (SILVA JÚNIOR et al, 2020;NÓBREGA et al, 2020). Embora, os efeitos podem ocorrer em todos os estádios de desenvolvimento, todavia a germinação e o crescimento inicial das plântulas são as fases mais afetadas pela salinidade, na maioria das plantas (SARABI et al, 2016).…”

“…A influência da salinidade no vigor, qualidade das sementes e acúmulo de biomassa tem sido reportadas em mudas de melancia por Silva Júnior et al (2020) e Nóbrega et al (2020), onde os autores observaram deterioração da qualidade de sementes e redução no acúmulo na biomassa seca de plantas. Portanto, avaliar o nível de tolerâncias das plantas aos sais é fundamental em áreas afetadas que podem comprometer a implantação da cultura (COVA et al, 2016), principalmente na fase de produção de mudas de melancia que está em ascensão científica (SILVA JÚNIOR et al, 2020).…”