The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean
Chlorophyll determination with a portable chlorophyll meter can indicate the period of highest N demand of plants and whether sidedressing is required or not. In this sense, defining the optimal timing of N application to common bean is fundamental to increase N use efficiency, increase yields and r...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Ciência do Solo
2012-02-01
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| Series: | Revista Brasileira de Ciência do Solo |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100019&lng=en&tlng=en |
| _version_ | 1818666580684308480 |
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| author | Suelen Cristina Mendonça Maia Rogério Peres Soratto Beatriz Nastaro Lucas Barbosa de Freitas |
| author_facet | Suelen Cristina Mendonça Maia Rogério Peres Soratto Beatriz Nastaro Lucas Barbosa de Freitas |
| author_sort | Suelen Cristina Mendonça Maia |
| collection | DOAJ |
| description | Chlorophyll determination with a portable chlorophyll meter can indicate the period of highest N demand of plants and whether sidedressing is required or not. In this sense, defining the optimal timing of N application to common bean is fundamental to increase N use efficiency, increase yields and reduce the cost of fertilization. The objectives of this study were to evaluate the efficiency of N sufficiency index (NSI) calculated based on the relative chlorophyll index (RCI) in leaves, measured with a portable chlorophyll meter, as an indicator of time of N sidedressing fertilization and to verify which NSI (90 and 95 %) value is the most appropriate to indicate the moment of N fertilization of common bean cultivar Perola. The experiment was carried out in the rainy and dry growing seasons of the agricultural year 2009/10 on a dystroferric Red Nitosol, in Botucatu, São Paulo State, Brazil. The experiment was arranged in a randomized complete block design with five treatments, consisting of N managements (M1: 200 kg ha-1 N (40 kg at sowing + 80 kg 15 days after emergence (DAE) + 80 kg 30 DAE); M2: 100 kg ha-1 N (20 kg at sowing + 40 kg 15 DAE + 40 kg 30 DAE); M3: 20 kg ha-1 N at sowing + 30 kg ha-1 when chlorophyll meter readings indicated NSI < 95 %; M4: 20 kg ha-1 N at sowing + 30 kg ha-1 N when chlorophyll meter readings indicated NSI < 90 % and, M5: control (without N application)) and four replications. The variables RCI, aboveground dry matter, total leaf N concentration, production components, grain yield, relative yield, and N use efficiency were evaluated. The RCI correlated with leaf N concentrations. By monitoring the RCI with the chlorophyll meter, the period of N sidedressing of common bean could be defined, improving N use efficiency and avoiding unnecessary N supply to common bean. The NSI 90 % of the reference area was more efficient to define the moment of N sidedressing of common bean, to increase N use efficiency. |
| first_indexed | 2024-12-17T06:06:48Z |
| format | Article |
| id | doaj.art-9d232b2ccc324acdb062e942840dc77c |
| institution | Directory Open Access Journal |
| issn | 1806-9657 |
| language | English |
| last_indexed | 2024-12-17T06:06:48Z |
| publishDate | 2012-02-01 |
| publisher | Sociedade Brasileira de Ciência do Solo |
| record_format | Article |
| series | Revista Brasileira de Ciência do Solo |
| spelling | doaj.art-9d232b2ccc324acdb062e942840dc77c2022-12-21T22:00:45ZengSociedade Brasileira de Ciência do SoloRevista Brasileira de Ciência do Solo1806-96572012-02-0136118319210.1590/S0100-06832012000100019S0100-06832012000100019The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common beanSuelen Cristina Mendonça Maia0Rogério Peres Soratto1Beatriz Nastaro2Lucas Barbosa de Freitas3Universidade Estadual PaulistaUniversidade Estadual PaulistaUniversidade de São PauloUniversidade Estadual PaulistaChlorophyll determination with a portable chlorophyll meter can indicate the period of highest N demand of plants and whether sidedressing is required or not. In this sense, defining the optimal timing of N application to common bean is fundamental to increase N use efficiency, increase yields and reduce the cost of fertilization. The objectives of this study were to evaluate the efficiency of N sufficiency index (NSI) calculated based on the relative chlorophyll index (RCI) in leaves, measured with a portable chlorophyll meter, as an indicator of time of N sidedressing fertilization and to verify which NSI (90 and 95 %) value is the most appropriate to indicate the moment of N fertilization of common bean cultivar Perola. The experiment was carried out in the rainy and dry growing seasons of the agricultural year 2009/10 on a dystroferric Red Nitosol, in Botucatu, São Paulo State, Brazil. The experiment was arranged in a randomized complete block design with five treatments, consisting of N managements (M1: 200 kg ha-1 N (40 kg at sowing + 80 kg 15 days after emergence (DAE) + 80 kg 30 DAE); M2: 100 kg ha-1 N (20 kg at sowing + 40 kg 15 DAE + 40 kg 30 DAE); M3: 20 kg ha-1 N at sowing + 30 kg ha-1 when chlorophyll meter readings indicated NSI < 95 %; M4: 20 kg ha-1 N at sowing + 30 kg ha-1 N when chlorophyll meter readings indicated NSI < 90 % and, M5: control (without N application)) and four replications. The variables RCI, aboveground dry matter, total leaf N concentration, production components, grain yield, relative yield, and N use efficiency were evaluated. The RCI correlated with leaf N concentrations. By monitoring the RCI with the chlorophyll meter, the period of N sidedressing of common bean could be defined, improving N use efficiency and avoiding unnecessary N supply to common bean. The NSI 90 % of the reference area was more efficient to define the moment of N sidedressing of common bean, to increase N use efficiency.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100019&lng=en&tlng=enPhaseolus vulgarisclorofilaíndice relativo de clorofilaclorofilômetro |
| spellingShingle | Suelen Cristina Mendonça Maia Rogério Peres Soratto Beatriz Nastaro Lucas Barbosa de Freitas The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean Revista Brasileira de Ciência do Solo Phaseolus vulgaris clorofila índice relativo de clorofila clorofilômetro |
| title | The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean |
| title_full | The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean |
| title_fullStr | The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean |
| title_full_unstemmed | The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean |
| title_short | The nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean |
| title_sort | nitrogen sufficiency index underlying estimates of nitrogen fertilization requirements of common bean |
| topic | Phaseolus vulgaris clorofila índice relativo de clorofila clorofilômetro |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832012000100019&lng=en&tlng=en |
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