Silicate Fertilization in Sugarcane: Silicon Availability, Uptake, and Recovery Index Over Two Consecutive Cycles

Author(s)

Camargo, Monica Sartori ^[1] ; Rocha, Gabriela ^[2] ; Baltieri, Gustavo Jonas ^[2]

Affiliation

^[1] Agencia Paulista Tecnol Agronegocios APTA, Polo Ctr Sul, BR-13412050 Piracicaba, SP - Brazil

^[2] Fac Tecnol Piracicaba, BR-13414141 Piracicaba - Brazil

• Document type: Journal article
• Source: JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION; v. 21, n. 3 JUL 2021.
• Web of Science Citations: 0

Abstract

Multiple harvests of sugarcane with high silicon (Si) uptake decrease Si soil levels, and Si fertilization may be necessary. The association of Si levels in soil, uptake, and recovery from silicate could enhance the understanding of the efficiency of Si fertilization. The objectives were to evaluate the effects of silicate rates applied in furrows at planting on soluble Si contents at two depths, Si uptake, the correlation between Si in the soil and Si in the leaves, and the recovery index (RI) of Si from silicate during two consecutive cycles of sugarcane cultivars. The experiment was conducted in randomized blocks with four Si rates (0, 55, 110, and 165 kg ha(-1) Si) as silicate and two sugarcane cultivars (IAC87-3396 and SP89-1115) in two consecutive cycles. Silicate fertilization increased the Si extracted by 0.5 mol L-1 acetic acid and 0.01 mol L-1 CaCl2 at 0-25 cm after 6, 17, and 29 months, while this only occurred with acetic acid at 25-50 cm and CaCl2 after first ratoon. Both Si extractants showed a satisfactory correlation (R = 0.40-0.52) with Si concentration in the top visible dewlap leaves, enabling the evaluation of the Si availability in soil samples from 0 to 25 cm and 25 to 50 cm after 6 months. There was 40% Si recovery from silicate over the two consecutive cycles. Si application in furrows at planting is a potential tool to increase Si availability in soil at 0-25 cm, Si uptake by stalks, and Si recovery from silicate after two consecutive cycles. (AU)

• FAPESP's process: 08/10795-2 - Silicon fertilization to sugarcane: influence on yield, technological quality and stalk borer and rust incidence
• Grantee: Mônica Sartori de Camargo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/05843-0 - Silicon fertilization in sugarcane: rates, cultivars and water deficit
• Grantee: Mônica Sartori de Camargo
• Support Opportunities: Regular Research Grants
• FAPESP's process: 06/06288-2 - Interrelashionship between soil, production, borer stalk and rust severity and silicon absorption by sugarcane at São Paulo State
• Grantee: Mônica Sartori de Camargo
• Support Opportunities: Regular Research Grants