Tensile strenght of an Eutroferric Oxisoil under different use and management

• Grant number: 12/23428-3
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: March 01, 2013
• End date: December 31, 2013
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: José Eduardo Corá
• Grantee: Felipe Biondi Fernandes de Lima
• Host Institution: Faculdade de Ciências Agrárias e Veterinárias (FCAV). Universidade Estadual Paulista (UNESP). Campus de Jaboticabal. Jaboticabal , SP, Brazil

Abstract

Tensile strenght of an Eutroferric Oxisoil under different use and management. Abstract: The hypothesis of the study is that the tensile (RT) of soil aggregates is used as an indicator of the impact of management on soil quality due to the response to mechanical and physical processes related to handling them as preparation, training surface crusting, seedling emergence and root penetration. The objective is to evaluate the effects of different soil management systems in tensile strength of aggregates. The soil was classified as an Oxisol. Seven situations will be evaluated land use: (a) native forest, (b) grazing for over 30 years, (c) conventional tillage system for over 35 years, no-till systems (since 1990) divided into: ( d) soybeans / corn with nitrogen fertilization in corn; (e) soybeans / corn without nitrogen fertilization in corn; (f) corn / maize, corn with nitrogen fertilization in summer; (g) corn / maize without nitrogen fertilization. In each situation of use of the soil are collected soil blocks 4 by treatment with dimensions of 10x20x15 cm in height, length and width respectively in the 0-10 cm depth. The desired size of aggregates for determining the tensile strength will be obtained by sieving using sieves with apertures of between 19.0 and 12.5 mm, as Imhoff et al. (2002). All aggregates will undergo an initial treatment, in which its edges are trimmed manually, contributing to the natural aggregates acquire spherical shape, without interfering with the structural condition of the soil (Grant et al. 1990). Subsequently, half of the spherical aggregates undergo further treatment, where they will individually planed part of its surface, called the basal area. Because there is no experiment, each soil management situation will be considered as a random sample, population size 40 (soil aggregates). Data collected from each situation management will be described and analyzed statistically for amplitude, frequency distribution, standard deviation, median, mean and standard error of the mean. The comparison of the situations management will be performed by t test at 5% probability.(AU)