Evaluation of methodologies and doses of plaster in the soil and its correlation with the yield of an agricultural production system

• Grant number: 18/17115-9
• Support Opportunities: Scholarships in Brazil - Scientific Initiation
• Start date: November 01, 2018
• End date: October 31, 2020
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: Marcelo Andreotti
• Grantee: Moisés Vinicius Garcia Garruti
• Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil

Abstract

In integrated agricultural production systems (SIPAs) associated with no-tillage system (SPD), the use of agricultural gypsum as an additional input to the limestone has shown favorable results, giving conditions for greater root exploitation in the soil profile and, consequently, greater cycling of nutrients. However, there is a lack of research in Cerrado soils to elucidate which recommendation of surface plaster dose correlates with agricultural productivity over time and how this practice may interfere with soil physical, chemical and biological attributes. Thus, the research work will evaluate after one year of the plaster, which methodology is better correlated with the agricultural productivity in a OXISOL in the Cerrado. The experiment will evaluate 6 methods of recommendation of gypsum doses available in the literature, correlating them with the productivity of rotating crops, one year after the practice of the plaster. The experimental design will be a randomized complete block design, with four replicates, the six methodologies for recommending gypsum doses present in the literature (layer of 0.20 to 0.40 m): Treatment 1: Control (Dose ZERO gypsum); Treatment 2: Methodology of Raij et al. (1996) - 3.2 t ha-1; Treatment 3: Sousa and Lobato Methodology (2004) (Cerrado clay soil) - 2.6 t ha-1; Treatment 4: Methodology of Sousa, Lobato and Rein (2005) - 2.2 t ha-1; Treatment 5: Caires and Guimarães Methodology (2016) - 4.5 t ha-1; and Treatment 6: Methodology of Vitti et al. (2008) - 1.3 t ha-1. It is expected with this research to evaluate the mobility of the agricultural gypsum gradient in the soil layers of 0 - 0.10; 0.10-0.40, 0.20-0.40 and 0.40-0.60 m in September 2018 and 2019, as well as the potential for deepening of the root system in the subsurface layers and the ideal dose for the soil of the cerrado, trying to identify the best correlation of methodology of long - term plaster recommendation.