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Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal

Most of the soils of Nepal had a higher potassium (K, expressed as K(2)O) level inherently. Later in 1976, the Government of Nepal has recommended K fertilizer rate at 30 kg K(2)O ha(-1) in rice-wheat cropping systems. However, those crops began showing K deficiency symptoms in recent decades, which...

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Autores principales: Ojha, Roshan Babu, Shrestha, Shova, Khadka, Yajna Gajadhar, Panday, Dinesh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7971854/
https://www.ncbi.nlm.nih.gov/pubmed/33735327
http://dx.doi.org/10.1371/journal.pone.0248837
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author Ojha, Roshan Babu
Shrestha, Shova
Khadka, Yajna Gajadhar
Panday, Dinesh
author_facet Ojha, Roshan Babu
Shrestha, Shova
Khadka, Yajna Gajadhar
Panday, Dinesh
author_sort Ojha, Roshan Babu
collection PubMed
description Most of the soils of Nepal had a higher potassium (K, expressed as K(2)O) level inherently. Later in 1976, the Government of Nepal has recommended K fertilizer rate at 30 kg K(2)O ha(-1) in rice-wheat cropping systems. However, those crops began showing K deficiency symptoms in recent decades, which could be due to a large portion of soils with depleted K level or the insufficient input of K fertilizer for crop production. This study explored a limitation of K nutrient in the crops by establishing field trials from 2009–2014 at three agro-ecozones i.e., inner-Terai (2009–2010), high-Hills (2011–2012), and Terai (2012–2014) in Nepal. Seven rates of K fertilizer at 0, 15, 30, 45, 60, 75, and 90 kg K(2)O ha(-1) were replicated four times in a randomized complete block design, where crop yields and yield-attributing parameters of rice-wheat cropping system were recorded. Results revealed that an increase in K rates from 45 to 75 kg K(2)O ha(-1) under inner-Terai and Terai conditions and 45 to 60 kg ha(-1) under high-Hills conditions produced significantly higher grain yields compared to the recommended K dose. Economically, the optimum rate of K fertilizer should not exceed 68 kg K(2)O ha(-1) for rice in all agro-ecozones, or 73 kg K(2)O ha(-1) for wheat in inner-Terai and 60 kg K(2)O ha(-1) for wheat in high-Hills and Terai. Our findings suggest to increase potassium application in between 1.5 to 2.5 times of the current K fertilizer rate in rice-wheat cropping system of Nepal that need to be tested further in different locations and crop varieties.
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spelling pubmed-79718542021-03-31 Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal Ojha, Roshan Babu Shrestha, Shova Khadka, Yajna Gajadhar Panday, Dinesh PLoS One Research Article Most of the soils of Nepal had a higher potassium (K, expressed as K(2)O) level inherently. Later in 1976, the Government of Nepal has recommended K fertilizer rate at 30 kg K(2)O ha(-1) in rice-wheat cropping systems. However, those crops began showing K deficiency symptoms in recent decades, which could be due to a large portion of soils with depleted K level or the insufficient input of K fertilizer for crop production. This study explored a limitation of K nutrient in the crops by establishing field trials from 2009–2014 at three agro-ecozones i.e., inner-Terai (2009–2010), high-Hills (2011–2012), and Terai (2012–2014) in Nepal. Seven rates of K fertilizer at 0, 15, 30, 45, 60, 75, and 90 kg K(2)O ha(-1) were replicated four times in a randomized complete block design, where crop yields and yield-attributing parameters of rice-wheat cropping system were recorded. Results revealed that an increase in K rates from 45 to 75 kg K(2)O ha(-1) under inner-Terai and Terai conditions and 45 to 60 kg ha(-1) under high-Hills conditions produced significantly higher grain yields compared to the recommended K dose. Economically, the optimum rate of K fertilizer should not exceed 68 kg K(2)O ha(-1) for rice in all agro-ecozones, or 73 kg K(2)O ha(-1) for wheat in inner-Terai and 60 kg K(2)O ha(-1) for wheat in high-Hills and Terai. Our findings suggest to increase potassium application in between 1.5 to 2.5 times of the current K fertilizer rate in rice-wheat cropping system of Nepal that need to be tested further in different locations and crop varieties. Public Library of Science 2021-03-18 /pmc/articles/PMC7971854/ /pubmed/33735327 http://dx.doi.org/10.1371/journal.pone.0248837 Text en © 2021 Ojha et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Ojha, Roshan Babu
Shrestha, Shova
Khadka, Yajna Gajadhar
Panday, Dinesh
Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal
title Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal
title_full Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal
title_fullStr Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal
title_full_unstemmed Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal
title_short Potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of Nepal
title_sort potassium nutrient response in the rice-wheat cropping system in different agro-ecozones of nepal
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7971854/
https://www.ncbi.nlm.nih.gov/pubmed/33735327
http://dx.doi.org/10.1371/journal.pone.0248837
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