SALT STRESS AND AMBIENCE ON THE PRODUCTION OF WATERMELON SEEDLINGS

Fred Denilson Barbosa Da Silva,Francisco Barroso Da Silva Junior,José Thomas Machado De Sousa,Geocleber Gomes De Sousa,Carla Ingryd Nojosa Lessa

doi:10.1590/1983-21252020v33n224rc

Fred Denilson Barbosa Da Silva, Francisco Barroso Da Silva Junior + Show 3 more

Open Access

https://doi.org/10.1590/1983-21252020v33n224rc

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Abstract

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.

Highlights

The growing search for healthy foods has been attributing to the production of vegetable and fruit-bearing species more and more importance in the national and international scenario
A completely randomized experimental design was adopted in a split-split-plot scheme, 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 subsubplot to four types of substrates (SB1 = vermiculite + coconut fiber - 1:1, SB2 = manure + soil - 1:1, SB3 = carbonized rice husk + soil - 1:1, SB4 = biochar + soil - 1:1), with 4 replicates of 25 seeds
It is possible that these substrates in the environment under full sun did not provide favorable humidity and temperature conditions for seed emergence, since water absorption is fundamental for cotyledons to increase their volume, which leads to the breakage of the coat, facilitating the emergence of the root hypocotyl axis and other internal structures of the seed (BORGES et al, 2009)

Summary

ESTRESSE SALINO E AMBIÊNCIA NA PRODUÇÃO DE MUDAS DE MELANCIA

RESUMO - Objetivou-se com este trabalho avaliar a produção de mudas de melancia irrigadas com águas salinas e cultivadas em diferentes tipos de ambientes e substratos. O delineamento experimental foi o inteiramente casualizado com parcelas subsubdivididas, sendo a parcela os dois ambientes de cultivo (AM1 = pleno sol e AM2 = telado preto com 50% de sombreamento), a subparcela as duas águas de irrigação (AI1 = 0,8 e AI2 = 2,5 dS m-1) e a subsubparcela os quatro tipos de substratos (SB1 = vermiculita + fibra de coco, SB2 = esterco + solo, SB3 = casca de arroz carbonizado + solo, SB4 = biocarvão + solo), com quatro repetições de vinte e cinco sementes. O tratamento AM2 propiciou melhores condições de emergência e crescimento inicial, já o tratamento AM1 também se mostrou favorável à emergência e crescimento inicial de mudas de melancia, quando utilizados os substratos SB1 e SB2.

INTRODUCTION

MATERIAL AND METHODS

Chemical characteristics

Full sun

Overall mean

CONCLUSIONS

Findings

SALT STRESS AND AMBIENCE ON THE PRODUCTION OF WATERMELON SEEDLINGS