The Open Agriculture Journal




ISSN: 1874-3315 ― Volume 13, 2019
RESEARCH ARTICLE

Response of Soil Chemical Properties, Performance and Quality of Sweet Potato (Ipomoea Batatas L.) to Different Levels of K Fertilizer on a Tropical Alfisol



Christopher M. Aboyeji1, Aruna O. Adekiya1, *, Oluwagbenga Dunsin1, Ojo T. V. Adebiyi1, Charity O. Aremu1, Temidayo A. J. Olofintoye2, Babatunde O. Ajiboye1, Iyiola O. Owolabi3
1 College of Agricultural Sciences, Landmark University, PMB 1001, Omu-Aran, Kwara State Nigeria
2 National Horticultural Research Institute, P.M.B 5432, Idi-Ishin Ibadan, Nigeria
3 Faculty of Agro-Industry, Prince of Songkla University, Hat-Yai 90112, Thailand

Abstract

Background:

The optimum rate of nutrient must be defined with reference to soil properties for individual crops and soil.

Objective:

Field experiments were carried out in 2015 and 2016 cropping seasons to determine the various levels (0, 40, 80, 120 and 160 kg ha-1) of potassium fertilizer (muriate of potash , KCl), on soil chemical properties, leaf nutrient contents, performance and proximate quality of sweet potatoes (Ipomoea batatas L.).

Method:

The five treatments were arranged in a randomized complete block design with three replicates.

Results:

Studies showed that K fertilizer in both the years significantly influenced N, P and K concentrations compared with the control and also increased the soil concentrations of these nutrients from 0 - 160 kg ha-1 K fertilizer. However, soil K only increased up to 80 kg ha-1 fertilizer after which there was a decrease. There was a reduction in the values of Ca and Mg in the soil as the levels of K increased. Leaf nutrient concentration of the sweet potato was consistent with the values of soil chemical properties recorded. 80 kg ha-1 K fertilizer was observed to be the highest value of sweet potato growth and tuber yield after which there was a reduction. The yield decrease was adduced to excessive K application leading to imbalanced sweet potato plant nutrition compared with N, P, Ca and Mg. K fertilizer significantly influenced moisture, vitamin C and carbohydrate compared with the control. The highest values of fibre and protein were obtained at 80 and 40 kg ha-1 K fertilizer, respectively. Dry matter and fat contents of the sweet potato reduced by K application from 0 - 160 kg ha-1 application rate.

Conclusion:

For best tuber yield, quality and economic response of K fertilizer to the sweet potato in the agro-ecological zone or in other similar soil conditions elsewhere in the tropics could be achieved by applying 80 kg ha-1 K fertilizer.

Keywords: Soil, Ipomoea batatas, Muriate of potash, Leaf nutrient concentration, Quality, Vitamin C.


Article Information


Identifiers and Pagination:

Year: 2019
Volume: 13
First Page: 58
Last Page: 66
Publisher Id: TOASJ-13-58
DOI: 10.2174/1874331501913010058

Article History:

Received Date: 08/01/2019
Revision Received Date: 18/03/2019
Acceptance Date: 31/03/2019
Electronic publication date: 30/04/2019
Collection year: 2019

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© 2019 Aboyeji et al.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: (https://creativecommons.org/licenses/by/4.0/legalcode). This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


* Address correspondence to this author at the College of Agricultural Sciences, Landmark University, PMB 1001, Omu-Aran, Kwara State Nigeria;Tel: +2348034813715; Emails: adekiya2009@yahoo.com, adekiya.aruna@ lmu.edu.ng


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