Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli
Broccoli (Brassica oleracea L. ssp. italica) is a crop benefiting greatly from nitrogen fertilization and the risk of leaching to groundwater is high. Nine N fertilizer treatments, from 0 to 225 kg N/ha and two irrigation treatments, irrigated and non-irrigated, were arranged in a split-plot design....
| Main Author: | |
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| Format: | Otro |
| Language: | Swedish Inglés |
| Published: |
2008
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| Subjects: | |
| Online Access: | https://stud.epsilon.slu.se/12563/ |
| _version_ | 1855572089381060608 |
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| author | Mellgren, Rickard |
| author_browse | Mellgren, Rickard |
| author_facet | Mellgren, Rickard |
| author_sort | Mellgren, Rickard |
| collection | Epsilon Archive for Student Projects |
| description | Broccoli (Brassica oleracea L. ssp. italica) is a crop benefiting greatly from nitrogen fertilization and the risk of leaching to groundwater is high. Nine N fertilizer treatments, from 0 to 225 kg N/ha and two irrigation treatments, irrigated and non-irrigated, were arranged in a split-plot design. Nitrogen had a curvilinear effect on marketable yield; an increase was seen up to an application of 165 kg N/ha where the response plateaued. Hollow stem was the only disorder related to N application noticed in this project. It was seen only in treatments receiving more than 165 kg N/ha and the number of heads affected was very low. Plant uptake of N was strongly affected by nitrogen application and a large effect from irrigation was observed at harvest. The
difference could only be explained by leaching early in the season and denitrification during the season. The risk of leaching early in the season is critical when the amount of precipitation and/or irrigation is above field capacity. Sap test, SPAD chlorophyll meter and Dualex were compared as a way to monitor nitrogen status. Sap test was the method showing the largest effect among different N applications but also the largest variability. The SPAD chlorophyll meter was very sensitive to differences in nitrogen application, even though it had the narrowest span from high to low fertilized plants. The Dualex showed the best relationship with plant nitrogen uptake. It quickly showed differences among N application and a good correlation with yield. The use of a reference plot is recommended to decrease the influence of factors other than N affecting test
results and to obtain relative values that can be used in different conditions. |
| format | Otro |
| id | RepoSLU12563 |
| institution | Swedish University of Agricultural Sciences |
| language | Swedish Inglés |
| publishDate | 2008 |
| publishDateSort | 2008 |
| record_format | eprints |
| spelling | RepoSLU125632017-10-25T07:34:21Z https://stud.epsilon.slu.se/12563/ Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli Mellgren, Rickard Horticulture (until 121231) Irrigation Broccoli (Brassica oleracea L. ssp. italica) is a crop benefiting greatly from nitrogen fertilization and the risk of leaching to groundwater is high. Nine N fertilizer treatments, from 0 to 225 kg N/ha and two irrigation treatments, irrigated and non-irrigated, were arranged in a split-plot design. Nitrogen had a curvilinear effect on marketable yield; an increase was seen up to an application of 165 kg N/ha where the response plateaued. Hollow stem was the only disorder related to N application noticed in this project. It was seen only in treatments receiving more than 165 kg N/ha and the number of heads affected was very low. Plant uptake of N was strongly affected by nitrogen application and a large effect from irrigation was observed at harvest. The difference could only be explained by leaching early in the season and denitrification during the season. The risk of leaching early in the season is critical when the amount of precipitation and/or irrigation is above field capacity. Sap test, SPAD chlorophyll meter and Dualex were compared as a way to monitor nitrogen status. Sap test was the method showing the largest effect among different N applications but also the largest variability. The SPAD chlorophyll meter was very sensitive to differences in nitrogen application, even though it had the narrowest span from high to low fertilized plants. The Dualex showed the best relationship with plant nitrogen uptake. It quickly showed differences among N application and a good correlation with yield. The use of a reference plot is recommended to decrease the influence of factors other than N affecting test results and to obtain relative values that can be used in different conditions. Broccoli (Brassica oleracea L. ssp. italica) är en gröda som har ett stort utbyte av kvävegödning, så risken för läckage till grundvattnet är stort. Nio olika kvävegivor, mellan 0 och 225 kg N/ha och två bevattningsfrekvenser, bevattning och ej bevattning, arrangerades i ett split-plot utförande. Kvävet hade en kurvlinjär effekt på säljbar skörd; en ökning observerades upp till 165 kg N/ha, därefter planade den ut. Broccoliplantor med ihålig stam var den enda fysiologiska skadan relaterad till kväve som observerades i detta projekt. Det var endast i kvävegivor över 165 kg N/ha som ihålig stam observerades och antalet var väldigt lågt. Upptaget av N var starkt relaterat till kvävegivans storlek och mätningarna vid skörd visade att påverkan från bevattningen var stor. Skillnaden kunde endast förklaras med läckage tidigt på säsongen och denitrifikation under säsongen. Risken för kväveläckage tidigt på säsongen är stor när nederbörden och/eller bevattningen är över jordens fältkapacitet. Växtsaftprovet var det test som visade störst skillnad mellan olika kvävegivor men också den största variationen mellan samma kvävegiva. SPAD klorofyllmätare var väldigt känslig för skillnader mellan kvävegivor även om den visade minst skillnad mellan hög och låg kvävegödning. Dualex hade bästa sambandet mellan växtens upptag av kväve och instrumentets resultat, den reagerade snabbt på kvävegödsling och hade en bra korrelation med skörden. Användandet av en referensruta rekommenderas för att minska påverkan från andra faktorer än kvävet på testresultatet och för att erhålla relativa värden som kan användas i olika förhållanden. 2008-03-14 Other NonPeerReviewed application/pdf sv https://stud.epsilon.slu.se/12563/1/mellgren_r_171025.pdf Mellgren, Rickard, 2008. Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli. UNSPECIFIED, Alnarp. Alnarp: (NL, NJ) > Horticulture <https://stud.epsilon.slu.se/view/divisions/ANSTI=3A1600.html> urn:nbn:se:slu:epsilon-s-8257 eng |
| spellingShingle | Horticulture (until 121231) Irrigation Mellgren, Rickard Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli |
| title | Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli |
| title_full | Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli |
| title_fullStr | Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli |
| title_full_unstemmed | Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli |
| title_short | Effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, SPAD chlorophyll meter and Dualex to monitor nitrogen status in broccoli |
| title_sort | effect of irrigation and nitrogen treatments on yield, quality, plant nitrogen uptake and soil nitrogen status and the evaluation of sap test, spad chlorophyll meter and dualex to monitor nitrogen status in broccoli |
| topic | Horticulture (until 121231) Irrigation |
| url | https://stud.epsilon.slu.se/12563/ https://stud.epsilon.slu.se/12563/ |