Plant Growth-Promoting Rhizobacteria (PGPR) and Humic Acid Amendment Improves N-use Efficiency in Sweet Potato

Musa Sadeq, Buraq and Tan, Ali Kee Zuan and Nur Maizatul Idayu Othman, . and Alkooranee, Jawadyn Talib and Wong, Mui Yun and Susilawati Kasim, . and ., Amaily Akter and ., Sayma Serine Chompa and Rahman, Md Ekhlasur (2023) Plant Growth-Promoting Rhizobacteria (PGPR) and Humic Acid Amendment Improves N-use Efficiency in Sweet Potato. Malaysian Journal of Soil Science (MJSS) (Malaysia), 27. pp. 111-124. ISSN 111-124

This study aimed to verify the effect of Plant Growth-Promoting Rhizobacteria (PGPR) and humic acid amendment with different N-fertilizer rates on sweet potato. The results showed that inoculation of UPMRB9 in combination with 50% fertilizer-N produced significantly higher dry matter (DM) in leaves, storage, and fibrous roots, and in the whole plant. Similar trends were observed for nitrogen use efficiency (NUE), in which 75% N+UPMB10 and 50% N+UPMRB9 treatments significantly produced higher efficiency by 44.89% and 40%, respectively. In addition, the highest OD of β-carotene, 0.71 and 0.68 mg gˉ¹, were observed in 50% N+UPMRB9 and 75% N+UPMB10, respectively. Sweet potato plants obtained greater NUE and N uptake when lower rates of N were used with the microbial inoculations. These findings show the ability of PGPR-HA to fix nitrogen and thereby increase N availability of soils, reducing the need to provide mineral nitrogen to crops. Thus, applying biofertilizer containing PGPR amended with humic acid could be a sustainable approach to improving the NUE and total N concentration of sweet potato plants. Higher N use efficiency will lead to savings in the amount of N fertilizer needed, thus reducing costs and promoting an eco-friendly approach at the same time.

Full text available from: Official URL: https://www.msss.com.my/mjss/Full%20Text/vol27/V27...

Abstract

This study aimed to verify the effect of Plant Growth-Promoting Rhizobacteria (PGPR) and humic acid amendment with different N-fertilizer rates on sweet potato. The results showed that inoculation of UPMRB9 in combination with 50% fertilizer-N produced significantly higher dry matter (DM) in leaves, storage, and fibrous roots, and in the whole plant. Similar trends were observed for nitrogen use efficiency (NUE), in which 75% N+UPMB10 and 50% N+UPMRB9 treatments significantly produced higher efficiency by 44.89% and 40%, respectively. In addition, the highest OD of β-carotene, 0.71 and 0.68 mg gˉ¹, were observed in 50% N+UPMRB9 and 75% N+UPMB10, respectively. Sweet potato plants obtained greater NUE and N uptake when lower rates of N were used with the microbial inoculations. These findings show the ability of PGPR-HA to fix nitrogen and thereby increase N availability of soils, reducing the need to provide mineral nitrogen to crops. Thus, applying biofertilizer containing PGPR amended with humic acid could be a sustainable approach to improving the NUE and total N concentration of sweet potato plants. Higher N use efficiency will lead to savings in the amount of N fertilizer needed, thus reducing costs and promoting an eco-friendly approach at the same time.

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Item Type:	Article
AGROVOC Term:	sweet potatoes
AGROVOC Term:	nitrogen fertilizers
AGROVOC Term:	humic acids
AGROVOC Term:	biofertilizers
AGROVOC Term:	dry matter
AGROVOC Term:	nitrogen fixation
AGROVOC Term:	nutrient uptake
Geographical Term:	Malaysia
Depositing User:	Mr. Khoirul Asrimi Md Nor
Date Deposited:	15 May 2025 03:11
Last Modified:	15 May 2025 03:11
URI:	http://webagris.upm.edu.my/id/eprint/2756

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