Criteria for topdressing nitrogen application to common bean using chlorophyll meter
| Autor: | Adriana Queiroz de Almeida, Suelen Cristina Mendonça Maia, Rogério Peres Soratto, Suzane Maria Liebe |
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| Přispěvatelé: | Inst Fed Goiano, Universidade Estadual Paulista (Unesp), Inst Fed Baiano |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
0106 biological sciences
Agriculture (General) chemistry.chemical_element relative chlorophyll index 01 natural sciences Phaseolus vulgaris nitrogen use efficiency S1-972 Crop nitrogen sufficiency index Chlorophyll index Animal science índice relativo de clorofila índice de suficiência de nitrogênio Mathematics biology Sowing adubação nitrogenada 04 agricultural and veterinary sciences nitrogen fertilization biology.organism_classification Chlorophyll meter Nitrogen folha diagnose eficiência de uso do nitrogênio chemistry N application 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Animal Science and Zoology Phaseolus Agronomy and Crop Science diagnostic leaf 010606 plant biology & botany |
| Zdroj: | Pesquisa Agropecuária Brasileira v.52 n.7 2017 Pesquisa Agropecuária Brasileira Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA Web of Science Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP Pesquisa Agropecuária Brasileira, Vol 52, Iss 7, Pp 512-520 (2017) Pesquisa Agropecuária Brasileira, Volume: 52, Issue: 7, Pages: 512-520, Published: JUL 2017 |
| Popis: | The objective of this work was to establish the diagnostic leaf and the nitrogen sufficiency index (NSI) values most appropriate to estimate N requirement by the 'Pérola' common bean (Phaseolus vulgaris), based on chlorophyll meter monitoring. The diagnostic leaf was defined in an experiment with five N rates, and up to four sampling dates of the diagnostic leaves were evaluated (first, second, and third completely expanded leaves from the apex). The NSI was established in two crop seasons, under six N managements: M1, 40 kg ha-1 N at sowing + 80 kg ha-1 10 days after emergence (DAE) + 80 kg ha-1 20 DAE (reference rate); M2, 20 kg ha-1 at sowing + 40 kg ha-1 10 DAE + 40 kg ha-1 20 DAE (recommended rate); M3, 20 kg ha-1 at sowing + 30 kg ha-1 when NSI |
| Databáze: | OpenAIRE |
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