Morphological characteristics of the annual ryegrass forage (Lolium multiflorum) cv. Jumbo with three nitrogen formulas
保存先:
| 著者: | , |
|---|---|
| フォーマット: | artículo original |
| 状態: | Versión publicada |
| 出版日付: | 2021 |
| その他の書誌記述: | The objective of this study was to evaluate the response of annual ryegrass cv. Jumbo with three nitrogen formulas (urea, ammonium nitrate and coated urea) at two altitudes in the tropical conditions of Costa Rica. The study was carried out from June 15, 2017 through February 15, 2018 in two areas of the province of Cartago, county Oreamuno (09°57,442 'N, 083°49,951' W, farm A [2.800 m.a.s.l.] and 09°54.839 'N, 083°50.058' W, farm B [2.000 m.a.s.l.]). Three treatments (urea, ammonium nitrate and protected urea) were evaluated in experimental plots at an equivalent of 200 kg N/ha/yr and sulfur was applied to all plots at an equivalent of 13.49 kg S/ha/yr. Samples were analyzed by the number of shoots, green leaves per shoot and structural components (percentage of leaves, stems and senescence) within the pasture. Both the number of shoots and green leaves per shoot were significantly higher (p <0.05) in August with respect to February. The percentage of leaf was higher in February compared to August (p <0.05) while the percentages of stem and senescence remained constant thorough the study period. No significant differences were found for any variable evaluated as a result of the nitrogen fertilizer used. |
| 国: | Portal de Revistas UCR |
| 機関: | Universidad de Costa Rica |
| Repositorio: | Portal de Revistas UCR |
| 言語: | Español |
| OAI Identifier: | oai:archivo.portal.ucr.ac.cr:article/48409 |
| オンライン･アクセス: | https://archivo.revistas.ucr.ac.cr/index.php/nutrianimal/article/view/48409 |
| キーワード: | abonos nitrogenados abonos de acción retardada morfología fenología estructura de la planta nitrogen fertilizers slow release fertilizers morphology phenology plant structure |