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Abstract
The use of soil remineralizers with efficient microorganisms (EM) can represent an effective and sustainable alternative to improve the growth, development, and yield of cultivated plants. Thus, the present study aimed to evaluate the effect of different doses of EM, in the presence or absence of rock dust (RD), on the development of iceberg lettuce, cultivar Lucy Brown. The design used was completely randomized, arranged in a 2 x 5 factorial scheme, with four replications. The treatments consisted of the presence and absence of RD in the substrate composition, combined with five commercial product doses based on EM (0, 2, 4, 6, and 8 L ha-1). At 30 days after transplanting, root and stem length, head circumference, the number of leaves, stem diameter, leaf area, fresh matter of root, stem, leaf, and shoot, and dry matter of root, stem, leaf, and shoot were evaluated. There was an interaction between the factors for most variables of economic importance. The dose of 4.5 L ha-1 of the product based on EM, combined with PR, implied the best performance of iceberg lettuce under the studied cultivation conditions.
Highlights
The lettuce (Lactuca sativa) belongs to the Asteraceae family, originally from the Mediterranean, and it is grown mainly in temperate regions (Favarato et al, 2017)
Considering the importance of adopting alternative sources of fertilizers for agriculture and the relevance of using biological products in organic cultivation to potentiate the growth of plants, this study aimed to evaluate the performance of the iceberg lettuce, cultivar Lucy Brown, depending on the composition of the substrate containing rock dust, associated with the application of efficient microorganisms
An exception was observed for stem fresh matter (SFM), which showed a significant result for the substrate composition
Summary
The lettuce (Lactuca sativa) belongs to the Asteraceae family, originally from the Mediterranean, and it is grown mainly in temperate regions (Favarato et al, 2017). Adaptations and technological introductions are necessary, such as the use of inorganic fertilizers in the production of vegetables (Silva, 2009). This type of inorganic fertilization is common in lettuce crops. These are palliative, which temporarily contributes to soil fertility, and improper use can cause long-term environmental damage (Farias et al, 2017). Fertilizer alternatives, such as organic and biological ones, are gaining prominence, as they allow food production with the moderate use of chemical inputs (Carvalho et al, 2018)
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