Response Function for the Srelative Index in Cambisol Treated With and Without Bovine Liquid Biofertilizer

Abstract

The present study aimed at assessing the influence of physical properties associated with soil structure on the S relative index. Two soil conditions under Ficus carica L. cultivation were studied (with or without liquid bovine biofertilizer in the irrigation water), in the 0-0.1 m and 0-0.3 m layers. Disturbed and undisturbed soil samples were collected from the above-mentioned layers and physical analyzes, pertinent to the study objective, were performed. The response function model was applied to verify how the soil independent physical variables influence on the S relative index in the 0-0.1 m and 0-0.3 m layers, with 0 and 60% biofertilizer, being combined two to two. Once the response functions were known, the slopes of both functions were compared, being represented by the coefficients β11-β12 and β21-β22. This comparison enabled verifying whether there was an effect of the treatments on the response variable. In addition, the standard error of the difference between coefficients was calculated, and the Student's t-test applied. The method of multiple regression was also used to confirm the effect of the variables on the S relative index for the 0-0.3 m layer in both treatments. Then, the variables with greater weight were selected by a backward elimination method to estimate the S relative . The results showed that the S relative index is strongly influenced by properties of the porous fraction, with total porosity and continuity of pores being of significant influence. Management with liquid bovine biofertilizer results in improvement in the soil structure, with effects measured by the S relative index.Keywords: S index. Soil structure. Organic matter. FUNÇÃO DE RESPOSTA PARA O ÍNDICE S RELATIVO EM CAMBISSOLO TRATADO COM E SEM BIOFERTILIZANTE LÍQUIDO BOVINORESUMO -Objetivou-se com esta pesquisa estudar a influência de atributos físicos associados à estrutura do solo no índice S relativo . Foram contempladas duas situações de solo (sob cultivo de Ficus carica L., sem aplicação e com aplicação de biofertilizante bovino líquido na lâmina de irrigação), nas camadas de 0-0,1 m e 0 -0,3 m. Foram coletadas amostras de solo com estrutura preservada e não preservada nas camadas supracitadas e realizadas análises físicas pertinentes ao objetivo do estudo. Foi aplicado o modelo de função de resposta para verificar como as variáveis físicas do solo independentes influenciam no S relativo , nas camadas de 0-0,1 m e 0-0,3 m tratadas com 0 e 60 % do biofertilizante combinadas duas a duas. Conhecidas as funções de resposta compararam-se as inclinações de ambas as funções, representadas pelos coeficientes β 1 1-β 1 2 e β 2 1-β 2 2, para verificar se houve efeito dos tratamentos na variável resposta. Além disso, calculou-se o erro padrão da diferença entre os coeficientes e aplicou-se o teste t de Student. Também foi aplicado o método de regressão múltipla para verificar o efeito das variáveis sobre o S relativo para a camada de 0-0,3 m em ambos os tratamentos. Em seguida, por meio do método backward elimination foram sel...

Saline water and bovine biofertilizer chemically enriched on jackfruit seedlings var. soft

“…Similar behavior was observed for root growth in oiticica (Licania rigida Benth) seedlings irrigated with saline waters (DINIZ NETO et al, 2014). The biofertilizer, through its contribution of humic substances, promoted improvements in physical attributes of the soil, mainly in structure and porosity, which resulted in higher root growth under saline conditions (ALENCAR et al, 2018).…”

“…The salinity of the irrigation water reduced the ability of the roots to extract water from the substrate, which negatively interfered with photosynthetic processes and CO 2 assimilation, leading to a decrease in cell division and expansion (PARIHAR et al, 2015;NEGRÃO;SCHMÖCKEL;TESTER, 2017). However, because the enriched biofertilizer contained osmoregulatory substances such as potassium, its inclusion promoted greater absorption of water and nutrients by plants (ALENCAR et al, 2018).…”

“…The promising response of plants exposed to biofertilizer under irrigation with saline water is due to humic substances that promote improvements in the structure, porosity and hydraulic conductivity of the substrate (MELLEK et al, 2010;ALENCAR et al, 2018). This advantage contributes to greater root growth and biomass allocation in comparison to plants grown on soil without biofertilizer input, as reported for noni (Morinda citrifolia;SOUTO et al, 2013), oiticica (Licania rigida; DINIZ NETO et al, 2014) and papaya (Carica Papaya;LIMA NETO et al, 2016), respectively, for seedlings grown under non-salt and salt water irrigation.…”

Biofertilizers in horticultural crops

“…observed increases in phosphorus, potassium, calcium, magnesium, and soil organic matter promoted by the Supermagro, even with superiority to the contents of a soil fertilized with NPK. In the cultivation of yellow passion fruit,Cavalcante et al (2011b) observed that the Supermagro promoted the increase of boron, copper, and zinc micronutrients in the soil.Interferences in the microbiological activity and physical properties are the result of an indirect effect of the bovine manure biofertilizer in the soil(Alencar et al, 2018;Wang et al, 2019). In this perspective,Silva et al (2007b) observed that the increase in the doses of Vairo biofertilizer raised the mineralized carbon in the soi.…”