Abstract
ABSTRACT The use of organic fertilizers can increase the production of forest species for the extraction of wood from monoculture stands or integrated systems. This study aimed to evaluate the effect of applying doses of sheep manure on the biometric traits of Mimosa caesalpiniifolia (‘sabiá’) in a silviculture system in an area previously occupied by native degraded pasture in an Albaquult. The experimental design was randomized blocks with four repetitions, with treatments corresponding to five doses of sheep manure per plant: 0, 2, 4, 8, and 12 kg in the first year, while in the second year the double of the doses (0, 4, 8, 16 and 32 kg per plant) were applied as topdressing under the canopy. The following biometric variables were evaluated: height (H); root collar diameter (RCD); diameter at breast height (DBH); above-ground dry weight (AGDW); accumulation of nutrients (aerial part); and soil fertility. The plants were responsive to the organic fertilization regarding the variables H, DBH, and AGDW. The sheep manure increased the mean values of pH, P, K, Ca, Mg, SB, CEC, BS, S-SO4 2- and Zn, and reduced the potential acidity in the 0-0.20 m soil layer. The organic matter variable increased up to the dose of 13.70 kg per plant. The accumulation rates of macro and micronutrients in the ‘sabiá’ plants were N > Ca > K > Mg > P > S and Fe > Mn > B > Zn > Cu, respectively.
Highlights
The use of organic inputs is essential to assure the full development of perennial crops by acting as a source of nutrients, principally in areas with low soil fertility and/or small use of conventional fertilizers
The continuous use of organic fertilizers could improve the concentration of P in soil, but the most important is the chemical form of P that comes from organic fertilizer (Komiyama & Ito, 2019)
Since organic fertilization improves the chemical properties of the soil, this study aimed to evaluate the effect of sheep manure doses on the biometric traits of ‘sabiá’ grown and the chemical attributes in an area previously occupied by native degraded pasture in an Albaquult located in a semiarid region of the state of Ceará, Brazil
Summary
The use of organic inputs is essential to assure the full development of perennial crops by acting as a source of nutrients, principally in areas with low soil fertility and/or small use of conventional fertilizers. Studies have shown that the long-term use of organic fertilizers improves soil fertility in semiarid regions (García-Orenes et al, 2016; Souza et al, 2016). The information is spotty about the general soil fertility in Brazil’s semiarid Northeast region, some studies have indicated that phosphorus and nitrogen are the main limiting elements for plant nutrition (Salcedo, 2006; Menezes et al, 2012). The continuous use of organic fertilizers could improve the concentration of P in soil, but the most important is the chemical form of P that comes from organic fertilizer (Komiyama & Ito, 2019). Crops propagated from seedlings customarily receive more attention when employing organic fertilizers, principally because they exploit the same soil volume for the long-term, considering improving the physical and chemical properties (Rós et al, 2013) The manure of goats and sheep has larger concentrations of nitrogen, calcium, and manganese; sheep manure contains higher phosphorus and potassium concentrations than the manure from other animals, such as donkeys and cattle (Souto et al, 2005; 2013).
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