Abstract
The use of organic-mineral fertilizer produced by the manufacturing industry of lysine and threonine amino acids can improve the fertility of tropical soils. The objective of this study was to evaluate the influence of different doses of the organic-mineral fertilizer named Ajifer L-14 on chemical properties and on the response with increased production of a forage on a Red Latosol in the northwestern region of São Paulo State, Brazil. A randomized block design was used with seven treatments and four replications. The treatments consisted of: T1- control (without application of Ajifer L-14); T2- control (natural vegetation); T3- mineral fertilization according to crop requirements and soil analysis (application of 1.35 kg plot-1 of urea, 2.20 single superphosphate, and 0.51 KCl, corresponding to 60 of N, 40 P2O5 and 30 kg ha-1 of K2O); T4- fertilization with Ajifer L-14 according to the recommendation resulting from the soil chemical analysis (40 L plot-1, corresponding to 60 kg ha-1 N); T5- fertilization with Ajifer L-14, at a rate of 150 % of the recommended values (60 L plot-1, corresponding to 90 kg ha-1 N); T6- fertilization with Ajifer L-14 at a rate of 50 % of the recommended values (20 L plot-1, corresponding to 30 kg ha-1 N); T7- fertilization with Ajifer L-14 at a rate of 125 % of the recommended values (50 L plot-1, corresponding to 75 kg ha-1 N); T8- fertilization with Ajifer L-14 at a rate of 75 % of the recommended values (30 L plot-1, corresponding to 45 kg ha-1 N). The following soil chemical properties were evaluated (layers 0.0-0.1 and 0.1-0.2 m): P, organic matter, pH, K+, Ca2+, Mg2+, cation exchange capacity, potential acidity, and base saturation. The application of this organic-mineral fertilizer does not influence the soil chemical properties. Regression analysis indicated a polynomial relationship between the application rates of organic-mineral fertilizer and the production of dry matter and crude protein of Bracharia Brizantha.
Highlights
Adequate topsoil management with crop residues can prevent soil erosion, maintain the organic matter content and contribute to the sustainability of crop productivity
Several sources of organic matter (OM) and fertilizer have been used to minimize the costs for agriculture and stock raising; the organic by-product Ajifer L-14 from the fabrication of the essential amino acid lysine has proved interesting as an alternative low-cost source for crops and pastures, providing OM enrichment and fertilization, especially in the case of crops that are not directly consumed by humans
In relation to the levels established for soil fertility in São Paulo State by Raij et al (1997) the contents found in the soil under study had a very low P content, average values of OM, Mg2+, and K+, high acidity, high values for Ca2+, and low V % values (Table 1)
Summary
Adequate topsoil management with crop residues can prevent soil erosion, maintain the organic matter content and contribute to the sustainability of crop productivity. Several sources of OM and fertilizer have been used to minimize the costs for agriculture and stock raising; the organic by-product Ajifer L-14 from the fabrication of the essential amino acid lysine has proved interesting as an alternative low-cost source for crops and pastures, providing OM enrichment and fertilization, especially in the case of crops that are not directly consumed by humans. Ajifer L14 is a liquid product resulting from fermentation This process occurs when sugarcane syrup is fermented in the production of L-lysine and L-Threonine, which are amino acids used as feed supplement for poultry and swine. This fertilizer has been widely used as a rich source of N, S and OM (Costa et al, 2003)
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