AVAILABILITY OF PHOSPHORUS IN SOIL CULTIVATED WITH BRACHIARIA IN ROTATION WITH SOYBEAN

• Grant number: 12/18509-4
• Support Opportunities: Scholarships in Brazil - Master
• Effective date (Start): January 01, 2013
• Effective date (End): July 31, 2014
• Field of knowledge: Agronomical Sciences - Agronomy - Soil Science
• Principal Investigator: Ciro Antonio Rosolem
• Grantee: Danilo Silva Almeida
• Host Institution: Faculdade de Ciências Agronômicas (FCA). Universidade Estadual Paulista (UNESP). Campus de Botucatu. Botucatu , SP, Brazil

Abstract

In no tillage system it is possible to get benefits by the capacity of some plant species with greater ability to absorb phosphorus, changing the dynamics of the nutrient in the soil, and thus improve the availability of this nutrient for subsequent crops. The main objective of this study it is to assess the availability of phosphorus by brachiaria and its effect in soybeans crop. Three experiments will be conducted in Botucatu, SP. The first test begun to be conducted in no-tillage at 12 years ago. Treatments in the plots are areas that received two P sources (natural and soluble) spreaded over the soil in the begin of the offseason, totaling 400 kg P2O5 ha-1 since the implementation of the system, and more a control. In subplot treatments there are: the presence and absence of Brachiaria in offseason; and 3 doses of P in soybean planting, in subplots. It will be evaluated soil fertility before soybeans crop, the nutrient content and dry matter of Brachiaria and soybeans, and soybean yield. The second and third tests will be carried in a greenhouse, using soils from plots of the previous experiment, with contrasting species for the ability of P uptake, maize and lupine. The treatments are: soil that received or not soluble P spreaded over the soil; soil from plots that received 0 or 60 kg ha-1 de P2O5 in soybean sowings, all with and without Brachiaria in the offseason. It will be evaluated P fractions in rhizosphere and bulk soil, dry matter production and P uptake, shoot: root relation, length and root diameter. The results will be submitted to analysis of variance and means were compared by t test (LSD) at 5% probability.

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)

ALMEIDA, DANILO S.; PENN, CHAD J.; ROSOLEM, CIRO A.. Assessment of phosphorus availability in soil cultivated with ruzigrass. Geoderma, v. 312, p. 64-73, FEB 15 2018. (12/18509-4)

Academic Publications

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

ALMEIDA, Danilo Silva. Disponibilidade de fósforo em solo cultivado com braquiária em rotação com soja. 2014. Master's Dissertation - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agronômicas. Botucatu Botucatu.