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Silicon via fertigation in lettuce crop with different Meloidogyne incognita infestations

Grant number: 20/00195-0
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): May 01, 2020
Effective date (End): April 30, 2021
Field of knowledge:Agronomical Sciences - Agronomy - Crop Science
Principal Investigator:Renato de Mello Prado
Grantee:Tales Arthur de Souza Alonso
Home Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Lettuce culture (Lactuca sativa L.) is the most economically important leafy vegetable for Brazil. However, it is a culture susceptible to the attack of root-knot nematodes (Meloidogyne spp.), which impair their productivity. A sustainable alternative to control this pest in lettuce crops would be silicon use, but its agronomic efficiency is not yet known. In this context, the objective of this study is to evaluate the effects of potassium silicate applications via fertigation on lettuce (Vanda variety) inoculated with root-knot nematodes (Meloidogyne incognita). For this, a factorial experiment (3x2) will be carried out from 3 levels of nematode infestation and 2 silicon concentrations. Thus, the experiment will consist of six treatments:1- the absence of Si application and of inoculums; 2- the absence of Si application and moderate presence of inoculums (6,000 eggs and juveniles of the second stage of the nematode per seedling); 3- the absence of Si application and high presence of inoculums (12,000 eggs and second-stage juveniles of the nematode per seedling); 4- the presence of Si application via fertigation (2mmol/L) and absence of inoculums; 5- the presence of Si application via fertigation (2mmol/L) and moderate presence of inoculums (6,000 eggs and second-stage juveniles per seedling); 6- the presence of Si application via fertigation (2mmol/l) and high presence of inoculums (12,000 eggs and second-stage juveniles per seedling). The evaluated variables will be diameter, leaf area, number of leaves, fresh weight of shoot, dry weight of shoot and root; gall number, estimated nematode population, reproduction factor (final population/initial population), electrolyte leakage index, firmness and ascorbic acid content, Si concentration in root and shoot, and total phenolics. Data will be submitted to analysis of variance by F test and Tukey test (P <0.05), as well as multivariate analysis.