Root system and resistance to penetration of Mombaça grass fertilized with nitrogen and irrigated
| Autor: | Tatiane Beloni, Vanessa Cristina Piotto, Gracielle Caroline Mari, Alyson Andrade Pinheiro, Cassio Antonio Tormena, Ulysses Cecato |
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| Jazyk: | English<br />Portuguese |
| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Semina: Ciências Agrárias, Vol 37, Iss 5, Pp 3243-3252 (2016) |
| Druh dokumentu: | article |
| ISSN: | 1676-546X 1679-0359 |
| DOI: | 10.5433/1679-0359.2016v37n5p3243 |
| Popis: | High stocking rates in intensive pasture-based animal production systems may compromise the development of the forage roots due to increased resistance in the surface layer. This study tested the hypothesis that an increase in stocking rate resulting from different levels of nitrogen fertilization in irrigated Mombaça grass (Panicum maximum Jacq. cv. Mombaça) pasture under intermittent grazing could increase resistance to penetration and consequently the growth of the root system. A split-plot design with randomized blocks and subplots was used, including three replications and the following four treatments: 0, 200, 400 and 800 kg N ha?1 year. Evaluations performed in spring, summer and fall seasons were assigned as subplots. The highest values for area, diameter, length and percentage of root biomass (91.4%) were concentrated at the 0-10 cm soil depth, which is explained by the lower penetration resistance in this layer. Increased stocking rate resulting from increased levels of nitrogen in the Mombaça grass sward does not directly affect the penetration resistance of the soil or root characteristics. However, in the rainy season, higher nitrogen levels lead to increased resistance, as they provide higher cumulative stocking rates in this period. |
| Databáze: | Directory of Open Access Journals |
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