Fertirrigation with effluent treated with dairy in rice cultivation

• Grant number: 19/02921-2
• Support Opportunities: Regular Research Grants
• Duration: July 01, 2019 - February 28, 2022
• Field of knowledge: Agronomical Sciences - Agricultural Engineering - Soil and Water Engineering
• Principal Investigator: Tamara Maria Gomes
• Grantee: Tamara Maria Gomes
• Host Institution: Faculdade de Zootecnia e Engenharia de Alimentos (FZEA). Universidade de São Paulo (USP). Pirassununga , SP, Brazil
• Associated researchers: Fabrício Rossi ; Giovana Tommaso ; Rogers Ribeiro
• Associated scholarship(s): 20/04301-9 - Instrumentation applied to special irrigated rice cultivation with dairy treated effluent, BP.TT

Abstract

Rice cultivation in Brazil demands a large amount of water by irrigation, applied by flooding, in many cases, with great waste of water. An alternative to reduce the pressure of this type of system in water resources appears by the substitution for localized methods, in the case of grasses, the one that best adapts is the subsurface drip. Complementary to the irrigation method there may be a substitution of the best quality water, by treated wastewater from agroindustry, in addition to the source of moisture to the plants, there may also be partial substitution of nutrients, since these waters are rich in matter organic. For compensate the investment of the use of the systems located in irrigation, the cultivation of special rice, appears as a promising market for the requirement of Brazilian high cuisine. In this scenario, the objective of this project is to perform the cultivation of special rice fertirrigated by subsurface drip, with effluent treated with dairy. The experiment will be carried out in a protected environment, for better control of environmental conditions, in randomized blocks in the factorial scheme, and will be divided into two stages. In the first stage, three special rice cultivars (IAC 400, IAC 600, IAC 301) and three doses of dairy treated effluent, applied by fertirrigation, with four replications, totaling 36 plots, will be studied. The treatments applied for fertirrigation management will be: (T1) 100% water, with 100% of recommended fertilization for culture (RFC); (T2) 50% effluent and 50% water, with 50% RFC and (T3) 100% effluent, without fertilization. The second stage will be considered two conditions of soil moisture (saturated and field capacity) and five doses of dairy treated effluent, applied as fertirrigation source, with four replications, totaling 40 experimental plots. The treatments applied for fertirrigation management will be: (T1) 100% water, with 100% RFC; (T2) 25% effluent and 75% water, with 75% RFC; (T3) 50% effluent and 50% water, with 50% RFC; (T4) 75% effluent and 25% water, with 25% RFC and (T5) 100% effluent, without mineral fertilization. (AU)