Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones
Applying higher nitrogen (N) rates than required for optimum potato (<i>Solanum tuberosum</i> L.) growth leads to economic and environmental losses. The extent to which the N rate associated with maximum potato yields differs from that maximizing net revenue (NR) or potato specific gravi...
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| Format: | Article |
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MDPI AG
2021-07-01
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| Series: | Agronomy |
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| Online Access: | https://www.mdpi.com/2073-4395/11/7/1392 |
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| author | Judith Nyiraneza Athyna N. Cambouris Alison Nelson Mohammad Khakbazan Morteza Mesbah Isabelle Perron Noura Ziadi Jean Lafond |
| author_facet | Judith Nyiraneza Athyna N. Cambouris Alison Nelson Mohammad Khakbazan Morteza Mesbah Isabelle Perron Noura Ziadi Jean Lafond |
| author_sort | Judith Nyiraneza |
| collection | DOAJ |
| description | Applying higher nitrogen (N) rates than required for optimum potato (<i>Solanum tuberosum</i> L.) growth leads to economic and environmental losses. The extent to which the N rate associated with maximum potato yields differs from that maximizing net revenue (NR) or potato specific gravity is not fully understood. The objectives of this three-year study (2013–2015) conducted at five sites in three Canadian provinces (MB-1; MB-2; QC-1; QC-2; PEI) (15 site-years) were to: (i) assess potato marketable yield, NR, and specific gravity responses to increasing N application; (ii) calculate the N rate maximizing marketable (N<sub>max</sub>) yield and NR using different statistical models. The year, N fertilizer, and their interaction were significant on marketable yield and NR except at the MB-1 site where no significant effect of N was observed. No significant yield increases were observed at a N rate above 60 kg N ha<sup>−1</sup> at four site-years and above 120 kg N ha<sup>−1</sup> at five site-years, implying that the current recommended N rate could be reduced. All models fitted the marketable and NR data equally based on R<sup>2</sup>, mean bias error or root mean square error and resulted in comparable predicted yield and NR values. However, N<sub>max</sub> values were different depending on the model with higher values being predicted by the quadratic- (161.4 to 191.9 kg N ha<sup>−1</sup>) and the quadratic plateau models (60 to 191.9 kg N ha<sup>−1</sup>), while lower N<sub>max</sub> values were obtained with linear plateau- (60.6 to 129.8 kg N ha<sup>−1</sup>) and Mitscherlich–Baule plateau models (60.9 to 130. 9 kg N ha<sup>−1</sup>). Nitrogen rate maximizing NR was on average 4% lower than the N rate maximizing marketable yields, except at one site where it was higher by 26 kg N ha<sup>−1</sup> when the quadratic plus plateau model was used. Specific gravity tended to decrease with the N rate. Our study confirms trade-offs between the N rate maximizing yields or NR with that maximizing specific gravity. Nitrogen rate maximizing marketable yield and NR varies depending on the selected model. |
| first_indexed | 2024-03-10T09:48:34Z |
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| id | doaj.art-1af41c90e42345fcb8edb3081a9bae8d |
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| language | English |
| last_indexed | 2024-03-10T09:48:34Z |
| publishDate | 2021-07-01 |
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| spelling | doaj.art-1af41c90e42345fcb8edb3081a9bae8d2023-11-22T02:58:27ZengMDPI AGAgronomy2073-43952021-07-01117139210.3390/agronomy11071392Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian AgroecozonesJudith Nyiraneza0Athyna N. Cambouris1Alison Nelson2Mohammad Khakbazan3Morteza Mesbah4Isabelle Perron5Noura Ziadi6Jean Lafond7Agriculture and Agri-Food Canada (AAFC), 440 University Avenue, Charlottetown, PE C1A 4N6, CanadaAAFC, 2560 Hochelaga Boulevard, Quebec, QC G1V 2J3, CanadaAAFC, 303 Main Street, CDn Grain Comission Bldg, Winnipeg, MB R3C 3G7, CanadaAAFC, 2701 Grand Valley Road, PO BOX 1000A RR 3, Brandon, MB R7A 5Y3, CanadaAgriculture and Agri-Food Canada (AAFC), 440 University Avenue, Charlottetown, PE C1A 4N6, CanadaAAFC, 2560 Hochelaga Boulevard, Quebec, QC G1V 2J3, CanadaAAFC, 2560 Hochelaga Boulevard, Quebec, QC G1V 2J3, CanadaAAFC, 1468 St-Cyrille Street, Normandin, QC G8M 4K3, CanadaApplying higher nitrogen (N) rates than required for optimum potato (<i>Solanum tuberosum</i> L.) growth leads to economic and environmental losses. The extent to which the N rate associated with maximum potato yields differs from that maximizing net revenue (NR) or potato specific gravity is not fully understood. The objectives of this three-year study (2013–2015) conducted at five sites in three Canadian provinces (MB-1; MB-2; QC-1; QC-2; PEI) (15 site-years) were to: (i) assess potato marketable yield, NR, and specific gravity responses to increasing N application; (ii) calculate the N rate maximizing marketable (N<sub>max</sub>) yield and NR using different statistical models. The year, N fertilizer, and their interaction were significant on marketable yield and NR except at the MB-1 site where no significant effect of N was observed. No significant yield increases were observed at a N rate above 60 kg N ha<sup>−1</sup> at four site-years and above 120 kg N ha<sup>−1</sup> at five site-years, implying that the current recommended N rate could be reduced. All models fitted the marketable and NR data equally based on R<sup>2</sup>, mean bias error or root mean square error and resulted in comparable predicted yield and NR values. However, N<sub>max</sub> values were different depending on the model with higher values being predicted by the quadratic- (161.4 to 191.9 kg N ha<sup>−1</sup>) and the quadratic plateau models (60 to 191.9 kg N ha<sup>−1</sup>), while lower N<sub>max</sub> values were obtained with linear plateau- (60.6 to 129.8 kg N ha<sup>−1</sup>) and Mitscherlich–Baule plateau models (60.9 to 130. 9 kg N ha<sup>−1</sup>). Nitrogen rate maximizing NR was on average 4% lower than the N rate maximizing marketable yields, except at one site where it was higher by 26 kg N ha<sup>−1</sup> when the quadratic plus plateau model was used. Specific gravity tended to decrease with the N rate. Our study confirms trade-offs between the N rate maximizing yields or NR with that maximizing specific gravity. Nitrogen rate maximizing marketable yield and NR varies depending on the selected model.https://www.mdpi.com/2073-4395/11/7/1392linear plus plateau modelMitscherlich–Baule modelnet revenuenitrogenquadratic modelquadratic plus plateau model |
| spellingShingle | Judith Nyiraneza Athyna N. Cambouris Alison Nelson Mohammad Khakbazan Morteza Mesbah Isabelle Perron Noura Ziadi Jean Lafond Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones Agronomy linear plus plateau model Mitscherlich–Baule model net revenue nitrogen quadratic model quadratic plus plateau model |
| title | Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones |
| title_full | Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones |
| title_fullStr | Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones |
| title_full_unstemmed | Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones |
| title_short | Potato Yield, Net Revenue and Specific Gravity Responses to Nitrogen Fertilizer under Different Canadian Agroecozones |
| title_sort | potato yield net revenue and specific gravity responses to nitrogen fertilizer under different canadian agroecozones |
| topic | linear plus plateau model Mitscherlich–Baule model net revenue nitrogen quadratic model quadratic plus plateau model |
| url | https://www.mdpi.com/2073-4395/11/7/1392 |
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