Study of the fertility of a carbonate red brown soil in a biomass bank with Cenchrus purpureus cv. CUBA CT-115 of ten exploitation years
Article Sidebar
Main Article Content
Abstract
It was found in the soil pH decrease (5.38 to 5.07, P <0.001), assimilable P2O5 (31.7 to 27.3 ppm; P <0.016), assimilable K2O (56.5 to 48.2 ppm; P <0.001), exchangeable Mg++ (1.10 to 0.82) cmol (+)/kg, P <0.001), base change capacity BCC (3.06 to 2.67 cmol (+)/kg, P <0.002) and cation-exchange capacity CEC (4.39
to 4.12 cmol (+)/kg; P <0.006), while organic matter OM increased (2.62 to 2.80 %; P <0.004) and interchangeable Ca ++, Na + and K + were not affected. In this case, the compaction significantly increased and the porosity and basal respiration decreased. The tillers/bunch indicator, determined in the rainy and dry seasons of 2015, showed a lower value (P <0.0001) in the dry season (10.70), which coincided
with the lower value of the grass yield at that season of the year. The biomass of grass roots was higher in the depth of 15 - 30 cm of the soil (1.01 g/cylinder), in comparison with the superficial layer of 0 - 10 cm (0.54 g/ cylinder). However, in the area occupied by the biomass bank, in 2015 acceptable values in the grass morphological indicators, the macrofauna activity (especially earthworms) and the root biomass were found. It is concluded that this soil showed low resilience power, with significant decrease of pH and P, K and Mg contents in the bank that has ten years of uninterrupted grazing. This decrease in the indicators of soil fertility was also reflected in the decrease of CP, P and Ca contents, as well as in the CT-115 digestibility. These results warn about the need to supplement the animals that grazed in this bank with sources of protein, phosphorus and calcium to achieve
the right balance in their diets.
Key words: resilience, grazing, dairy unit, biomass.
Article Details
Those authors that have publications with this journal accept the following terms:
1. They will retain their copyright and guarantee the journal the right of first publication of their work, which will be simultaneously subject to the License Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) that allows third parties to share the work whenever its author is indicated and its first publication this journal. Under this license the author will be free of:
- Share — copy and redistribute the material in any medium or format
- Adapt — remix, transform, and build upon the material
- The licensor cannot revoke these freedoms as long as you follow the license terms.
Under the following terms:
- Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- NonCommercial — You may not use the material for commercial purposes.
- No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
2. The authors may adopt other non-exclusive license agreements to distribute the published version of the work (e.g., deposit it in an institutional telematics file or publish it in a monographic volume) whenever the initial publication is indicated in this journal.
3. The authors are allowed and recommended disseminating their work through the Internet (e.g. in institutional telematics archives or on their website) before and during the submission process, which can produce interesting exchanges and increase the citations of the published work. (See the Effect of open access).