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Nutritional status and yield of sweet potato in response to nitrogen application management using chlorophyll meter

Grant number: 21/05039-9
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2021
Effective date (End): August 31, 2022
Field of knowledge:Agronomical Sciences - Agronomy - Crop Science
Principal researcher:Adalton Mazetti Fernandes
Grantee:Arthur Victor de Oliveira
Home Institution: Centro de Raízes e Amidos Tropicais (CERAT). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil

Abstract

Nitrogen (N) is the second most taken-up nutrient by sweet potatoes (Ipomoea potatoes). Low N supply limits sweet potato yields, but oversupply increases vegetative growth and reduces storage root yield. Therefore, a balanced supply of N for sweet potatoes is essential to obtain high root yields. This work aims to evaluate the nutritional status and yield of sweet potatoes in response to N fertilization management using a chlorophyll meter. For this purpose, it is sought to establish the best N sufficiency index (NSI) to manage N fertilization in sweet potatoes. The experiment will be conducted in two locations, in a randomized block design, in a 2+6x2 factorial scheme, with four replications. The treatments will be composed of conventional N fertilization (50 kg ha-1 N), reference N fertilization (150 kg ha-1), and six NSI values (90%, 91%, 92%, 93%, 94%, and 95%) associated with two N application criteria (10 or 15 kg ha-1 N for each 1.0 percentage point below the treatment NSI value). The following will be evaluated: Relative chlorophyll index and N concentration in the leaves, nutrient concentration in the diagnostic leaves, number, mean weight, and yield of roots, NSI and N rate of maximum technical efficiency, and correlation analysis, and starch content in roots. The data obtained will be submitted to analysis of variance separately by the site. The means of factorial components referring to the N application criteria will be compared b.y the LSD test (pd0.05). The effects of NSI values will be evaluated by regression analysis (pd0.05). Orthogonal contrasts will be performed between the factorial treatments and the conventional and reference treatments. (AU)

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