Abstract
ABSTRACT The use of organic fertilizers facilitates the production of plant species compared to industrial fertilizers, with a remarkable contribution to soil and water conservation through soil structuring. Vetiver grass (Chrysopogon zizanioides (L.) Roberty) is widely used in soil bioengineering projects to stabilize slopes, increasing the resistance of the soil to shear strength. The objective of this study was to evaluate the effect of the development of vetiver grass at different doses of organic fertilizer on soil stabilization. An experimental test was carried out in a greenhouse, in pots, using the following doses of organic fertilizer: T0-0 g (control); T1-135 g; T2-270 g and T3-405 g of organic fertilizer. Shoot Dry Matter (SDM), Root Dry Matter (RDM), Root Length (RL), Number of Tillers per Plant (NT) and Plant Height (PH) were evaluated. The collected data were submitted to regression analysis at 5% probability. The analysed variables showed increasing values as greater amounts of organic fertilizer, leading to an increase in soil nutrient availability and, consequently, to improved plant development.
Highlights
The remediation of degraded areas is a major challenge both in urban environments and to keep productive land in rural areas
Considering that the soil moisture under the experimental conditions was always at field capacity, that the soil was highly porous (Entisol) and that the temperature in the greenhouse varied between 30 and 35°C, the environment was favourable for microbial activity
According to Malavolta (2006), phosphorus from decomposition becomes available in organic form and is integrated into microbial cells; most of it remains readily available to plants
Summary
The remediation of degraded areas is a major challenge both in urban environments and to keep productive land in rural areas. Biotechnics that use plant species in combination with inert materials for soil stabilization and protection against erosion can be used an alternative, as a complementary tool or even as a substitute for traditional civil engineering techniques (ARAÚJO-FILHO; HOLANDA; ANDRADE, 2013; MAFFRA; SUTILI, 2020). Vetiver grass (Chrysopogon zizanioides (L.) Roberty), a native species from India, is a perennial plant from tropical and subtropical regions and belongs to the family Poaceae. It is widely known and used due to its high performance in ecological restoration programs, as well as its effectiveness in the control and prevention of erosive processes since it presents good resistance to shear stress (TRUONG; LOCH, 2004; NG et al, 2019; ETTBEB et al, 2020). The versatility of vetiver grass use has received much interest, with emphasis on its biotechnical characteristics for use in slope stabilization works, its contribution to the increase of soil cohesion and its high adaptability to various edaphoclimatic conditions (HOLANDA et al, 2012; ARAÚJO FILHO et al, 2015; MACHADO et al, 2015; COSTA et al, 2020)
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