Academic Journal
Growth index in massai grass under different levels of nitrogen fertilization
| العنوان: | Growth index in massai grass under different levels of nitrogen fertilization |
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| المؤلفون: | Marcos Neves Lopes, Roberto Cláudio Fernandes Franco Pompeu, Magno José Duarte Cândido, Claudivan Feitosa de Lacerda, Rodrigo Gregório da Silva, Francisco Ronaldo Belem Fernandes |
| المصدر: | Revista Brasileira de Zootecnia, Vol 40, Iss 12, Pp 2666-2672 (2011) |
| بيانات النشر: | Sociedade Brasileira de Zootecnia, 2011. |
| سنة النشر: | 2011 |
| المجموعة: | LCC:Animal culture |
| مصطلحات موضوعية: | herbage growth, net assimilation rate, nitrogen fertilizer, Panicum maximum × Panicum infestum, Animal culture, SF1-1100 |
| الوصف: | This study aimed to evaluate the growth index of massai grass during two regrowth cycles in a greenhouse under five levels of nitrogen (0, 150, 300, 450 and 600 mg N/dm³ of soil) and eight growth ages (5, 8, 11, 14, 17, 20, 23 and 26 days) in a split-plot design with five replications. The following variables were evaluated: net assimilation rate, herbage growth rate, relative growth rate, leaf area ratio, leaf weight ratio and specific leaf area. The effect of nitrogen was detected on the variables net assimilation rate (regrowths 1 and 2), leaf area ratio (regrowth 1), leaf weight ratio (regrowths 1 and 2), specific leaf area (regrowths 1 and 2) and herbage growth rate (regrowths 1 and 2). The growth ages influenced the relative growth rate (regrowth 2) and the net assimilation rate (regrowth 2). The net assimilation rate presented linear effect, estimated in 0.70 and 2.86 g/m² leaf.day-1 for the 0 and 600 mg N/dm³ soil, respectively (regrowth 1). For each milligram of N/dm³ added, the leaf area ratio was reduced in 0.0000258 m² leaf/g plant (regrowth 1). The herbage growth rate was estimated in 1.38 and 37.02 g/m².day-1 (regrowth 1), and 4.37 and 32.20 g/m².day-1 (regrowth 2) for the 0 and 600 mg N/dm³ soil, respectively. The massai grass' growth is favored by nitrogen fertilization, and little do the growth ages affect the growth index of the plants. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Spanish; Castilian Portuguese |
| تدمد: | 1516-3598 1806-9290 |
| Relation: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001200008; https://doaj.org/toc/1516-3598; https://doaj.org/toc/1806-9290 |
| DOI: | 10.1590/S1516-35982011001200008 |
| URL الوصول: | https://doaj.org/article/f0252213bed5480ba7c7d7fd057d28c0 |
| رقم الانضمام: | edsdoj.f0252213bed5480ba7c7d7fd057d28c0 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 15163598 18069290 |
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| DOI: | 10.1590/S1516-35982011001200008 |