Abstract
The use of organic fertilizers in adequate doses is an alternative to reduce the use of inorganic inputs, improving the soil chemical attributes, and increasing the production and quality of sweet potato. In this perspective, the objectives of this study were: (i) to evaluate the effects of fertilization with poultry and bovine manure, Ribumin®, and of conventional fertilization on soil attributes, production, and quality of sweet potato; and (ii) to evaluate the residual effect of organic fertilization on the production components and quality of sweet potato, in the second crop cycle. The two experiments were developed in the 2018/2019 crop year at the Agrotechnical School of the Federal University of Roraima (UFRR), Brazil. The treatments were arranged in a randomized block design with three replications, using a (2 × 5 × 2) + 1 factorial arrangement referring to two manure sources (bovine and poultry manure) and five doses, aiming at increasing the content of soil organic matter (1.35%) to 2.35; 3.35; 4.35, and 5.35%, in the absence and presence of Ribumin®, and an additional treatment referring to organomineral fertilization. For the evaluation of the second cycle, the residual effect of the manure was evaluated by applying only Ribumin® and conventional fertilizers. In the first cycle, the addition of 50.4 t ha-1 of bovine manure without Ribumin® provided the highest values of total (14.7 t ha-1) and marketable yield (14.6 t ha-1). However, the addition of poultry manure associated with the application of Ribumin® provided no increments in the sweet potato production components. Under the same experimental conditions, chemical fertilization can be replaced by fertilization with organic sources.
Highlights
Sweet potato (Ipomoea batatas L.) is a horticultural species of the family Convolvulaceae, being the seventh most consumed carbohydrate-rich food source in the world (Chueyen and Eun, 2013)
The addition of poultry manure associated with the application of Ribumin® provided no increments in the sweet potato production components
Under the same experimental conditions, chemical fertilization can be replaced by fertilization with organic sources
Summary
Sweet potato (Ipomoea batatas L.) is a horticultural species of the family Convolvulaceae, being the seventh most consumed carbohydrate-rich food source in the world (Chueyen and Eun, 2013). In 2018, the state of Roraima alone produced 1,486 tons, the equivalent to 0.20% of the national production (IBGE, 2018). The importance of this crop includes nutritional and health benefits related to the consumption of the tuberous root. According to Chueyen and Eun (2013), sweet potato possesses phenolic compounds, anthocyanins, sporamins, carotenoids (Hussein et al, 2014), vitamins A, B, C, K, and E, which are important in the prevention of several diseases, contributing to food security in some regions (Low et al, 2017; Iese et al, 2018). In Brazil, besides these benefits, the crop is important for generating jobs and income for smallholder farmers
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
