Abstract
Applying biofertilizers made from wastes from tropical forest agroextrativism to improve the fertility of acidic and nutrient-poor soils is a viable strategy for sustainable development of family farming in Brazil’s North region. In this respect, the objective of this study was to evaluate the effect of applying biofertilizers based on locally available organic wastes on the fertility of a Dystrophic Yellow Latosol. The experiment was carried out in the Fazendinha experimental field of the Embrapa Amapá research unit, located in the municipality of Macapá, Amapá. We used a randomized block design with split-plots in space, with five replications. The plots consisted of seven fertilizations, with a control treatment (without fertilization) and six biofertilizers based on fresh cattle manure, shoot of Cecropia sp., leaves of Gliricidia sepium or Inga edulis and leaf sheath of Euterpe oleracea or pseudostem of Musa sp.; and the subplots were the two soil depths analyzed (0 to 2.5 and 2.5 to 5 cm). The biofertilizers promoted the correction of the soil acidity, increased the contents of organic matter, P, K+, Ca2+, Mg2+, and raised the sum of bases, cation exchange capacity and base saturation percentage, especially in the surface layer. It was observed a reduction in the chemical limitations on the Dystrophic Yellow Latosol by applying biofertilizers based on locally available organic wastes and the increase in organic matter in the soil positively correlated with the increase in the levels of the beneficial chemical attributes of the Dystrophic Yellow Latosol.
Highlights
Brazil is one of the main food exporters in the world and this production is significantly dependent on fertilizer imports
The plots consisted of seven fertilizations, with a control treatment and six biofertilizers based on fresh cattle manure, shoot of Cecropia sp., leaves of Gliricidia sepium or Inga edulis and leaf sheath of Euterpe oleracea or pseudostem of Musa sp.; and the subplots were the two soil depths analyzed (0 to 2.5 and 2.5 to 5 cm)
It was observed a reduction in the chemical limitations on the Dystrophic Yellow Latosol by applying biofertilizers based on locally available organic wastes and the increase in organic matter in the soil positively correlated with the increase in the levels of the beneficial chemical attributes of the Dystrophic Yellow Latosol
Summary
Brazil is one of the main food exporters in the world and this production is significantly dependent on fertilizer imports. In the Brazil’s North region due to the production chains geographic isolation and lower demand for fertilizers, high costs are observed, which limits the adoption and agricultural productivity. To improve agricultural productivity in these locations and reduce dependence on chemical fertilizers, highlights the use of organic fertilizers, especially compost and biofertilizer. The application of biofertilizers containing microorganisms and biologically active compounds lowers the physical resistance of the soil (Dias et al, 2011) and the toxicity of herbicides (Régo et al, 2014), attenuates saline stress (Sousa et al, 2018), increases the biological control of diseases (Yu et al, 2019), reduces the harmful effects of heavy metals and stimulates beneficial microbial consortia (Shen et al, 2018; Wang et al, 2019a). The characteristics of biofertilizers are directly related to the inputs used and the stabilization process employed and the efficiency of biofertilizers varies in function of the physical, chemical and biological characteristics, the form, quantity and frequency of application and the predominant edaphoclimatic factors of the region (Musadji et al, 2020)
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