Biochar and mill ash improve yields of sugarcane on a sand soil in Florida

• Published in: Agriculture, ecosystems & environment Vol. 253; pp. 122 - 130
• Main Authors: Alvarez-Campos, Odiney, Lang, Timothy A., Bhadha, Jehangir H., McCray, J. Mabry, Glaz, Barry, Daroub, Samira H.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.02.2018; Elsevier BV
• Subjects: Agricultural production; Ashes; Biochar; Charcoal; Crop yield; Crops; Hulls; Mill ash; Organic residues; Oryza; Saccharum officinarum; Sand; Sand soils; Sandy soils; Shavings; Silicon; Soil fertility; Soil improvement; Soil properties; Studies; Sucrose; Sugar; Sugarcane; Sugarcane productivity; Yard waste; South Florida; United States > US; Sand soils; Sugarcane productivity; Mill ash; Biochar; Organic residues
• ISSN: 0167-8809; 1873-2305
• DOI: 10.1016/j.agee.2017.11.006

•Mill ash applied at 2% and 6% (by weight) and biochar made from rice hulls applied at 2% significantly increased sugarcane biomass and sucrose yields compared with the control in plant-cane and first-ratoon crops.•Leaf silicon concentrations increased with mill ash and rice hulls biochar, which may have contributed to improved yields.•Mill ash and rice hulls biochar can potentially improve sugarcane yields on sand soils in South Florida. The addition of organic residues to sand soils can improve soil properties and sugarcane productivity. However, biochar use can have variable effects on crops, and few studies have evaluated the effect of mill ash applications on sand soils. This study aimed to determine the effect of mill ash, and three biochars on yields of sugarcane grown on sand soils of South Florida near the Everglades Agricultural Area (EAA). Nine treatments and a control were evaluated. Treatments consisted of mill ash (AS) and biochars produced from hardwood yard waste (HY), horse barn shavings (HM), and rice hulls (RH) incorporated at 1% and 2% (by weight) prior to the plant-cane crop of a lysimeter experiment that extended for two crop cycles. A standard practice treatment of mill ash applied at 6% was also included. Results show that mill ash applied at 6% and 2% (AS6 and AS2), and rice hulls biochar applied at 2% (RH2) produced significantly greater biomass and sucrose yields compared with the control in the plant-cane and the first-ratoon crops. Soil silicon concentrations increased with AS and RH in the plant-cane crop, which may have contributed to improved yields. Treatments AS6 and RH2 may have also increased sugarcane yields through improved soil properties. Our results show that mill ash and rice hulls biochar amendments can potentially improve sugarcane yields on sand soils near the EAA.