Residual effect of potassium fertilization on the forms of the nutrient in the soil

• Grant number: 15/18952-3
• Support Opportunities: Scholarships in Brazil - Master
• Start date: December 01, 2015
• End date: January 31, 2017
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: Luís Reynaldo Ferracciú Alleoni
• Grantee: Ruan Francisco Firmano
• Host Institution: Escola Superior de Agricultura Luiz de Queiroz (ESALQ). Universidade de São Paulo (USP). Piracicaba , SP, Brazil

Abstract

Potassium (K) acts over the enzymatic and metabolic processes at the cellular environment, and its availability to plants depends on its forms and on its behavior in the soil. The extraction of available contents of K is established as a reference for diagnosis and fertilization calculations in Brazil. However, the absence of response of crops to potassium fertilizer has been verified in soils with low contents of this element, which leads to the hypothesis that other less available forms of K), which are not extracted by conventional extractors, can contribute to plant nutrition. There is no critical limit among the soluble, the exchangeable, the non-exchangeable and the structural forms of K in the soil because the change of availability is dynamic. K is required in large quantities by the soybean (Glycine max L.). This study will be conducted with samples from an Oxisol cropped under no tillage since 1983 in an experimental field area in Londrina, state of Paraná, Brazil, to evaluate the effect of levels of potassium fertilizer on soybean yield. Since 2008, K fertilization has been stopped, and the plants have been nourished by the residual contents of K in the soil. We aim to (i) evaluate changes in chemical, physical and mineralogical soil properties as a function of time with restriction of potassium fertilization; (ii) study the mineral reserve of K in the clay fraction of the soil through sequential extractions of minerals as well as determining of the contents of potassium content in the extracts; (iii) to correlate the exchangeable and the non-exchangeable forms of K in the soil with the nutrient levels in the tissues and with the soybean yield.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

FIRMANO, RUAN FRANCISCO; MELO, VANDER DE FREITAS; DE OLIVEIRA JUNIOR, ADILSON; DE CASTRO, CESAR; FERRACCIU ALLEONI, LUIS REYNALDO. Soybean and Soil Potassium Pools Responses to Long-Term Potassium Fertilization and Deprivation under No-Till. Soil Science Society of America Journal, v. 83, n. 6, p. 1819-1829, NOV-DEC 2019. (15/18952-3)

FIRMANO, RUAN F.; MELO, VANDER FREITAS; MONTES, CELIA REGINA; DE OLIVEIRA JUNIOR, ADILSON; DE CASTRO, CESAR; FERRACCIU ALLEONI, LUS REYNALDO. POTASSIUM RESERVES IN THE CLAY FRACTION OF A TROPICAL SOIL FERTILIZED FOR THREE DECADES. CLAYS AND CLAY MINERALS, v. 68, n. 3, JUL 2020. (15/18952-3, 15/19121-8)

FIRMANO, RUAN FRANCISCO; DE OLIVEIRA JUNIOR, ADILSON; DE CASTRO, CESAR; ALLEONI, LUIS REYNALDO FERRACCIU. Potassium rates on the cationic balance of an Oxisol and soybean nutritional status after 8 years of K deprivation. EXPERIMENTAL AGRICULTURE, v. 56, n. 2, p. 293-311, APR 2020. (15/18952-3)

Academic Publications

(References retrieved automatically from State of São Paulo Research Institutions)

FIRMANO, Ruan Francisco. Residual effect of potassium fertilization on the nutrient forms in soil. 2017. Master's Dissertation - Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC) Piracicaba.