Soil and leaf nutrient interactions following application of calcium silicate slag to sugarcane
ABSTRACT In certain areas of the Everglades Agricultural Area, plant and ratoon sugarcane (Saccharum L.) yields are increased by application of Si from calcium silicate slag. The greatest yield responses are obtained in the plant crop the first year after application of slag and when plant uptake of Si is increased. Magnesium deficiencies have been reported after slag application. The objective of this study was to quantify interactions of soil and leaf nutrients on sugarcane grown on a Terra Ceia muck (Euic, hyperthermic Typic Medisaprist) that had previously received calcium silicate slag. Slag was applied at five rates, and yields were evaluated from plant, first-ratoon, and second-ratoon (stubble) crops at two locations. Soil and leaf from each crop were sampled for nutrient analysis and the results were used to interpret the yield data. Although slag increased cane yield by as much as 39% and sugar yield by 50%, for each 100 mg L–1 drop in extractable soil Mg, cane yields declined by 5.3 Mg ha–1 and sugar yields by 0.9 Mg ha–1. At leaf Si concentrations exceeding 10 g kg–1, optimum cane and sugar yields were observed, while leaf Mg concentrations approached critical leaf concentrations below 1.5 g kg–1. Estimates of total leaf nutrient uptake during each crop indicated that uptake of Mg did not meet nutrient demands at high biomass production. Nutrient antagonism between Si and Mg is suggested. Low soil Mg may contribute to the marked crop responses to slag and for the decline in stubble production. Application of a magnesium fertilizer may be necessary to maintain high nutrient availability.
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ABSTRACT: Sugarcane crop residues ('trash') have the potential to supply nitrogen (N) to crops when they are retained on the soil surface after harvest. Farmers should account for the contribution of this N to crop requirements in order to avoid over-fertilisation. In very wet tropical locations, the climate may increase the rate of trash decomposition as well as the amount of N lost from the soil-plant system due to leaching or denitrification. A field experiment was conducted on Hydrosol and Ferrosol soils in the wet tropics of northern Australia using N-15-labelled trash either applied to the soil surface or incorporated. Labelled urea fertiliser was also applied with unlabelled surface trash. The objective of the experiment was to investigate the contribution of trash to crop N nutrition in wet tropical climates, the timing of N mineralisation from trash, and the retention of trash N in contrasting soils. Less than 6% of the N in trash was recovered in the first crop and the recovery was not affected by trash incorporation. Around 6% of the N in fertiliser was also recovered in the first crop, which was less than previously measured in temperate areas (20-40%). Leaf samples taken at the end of the second crop contined 2-3% of N from trash and fertilizer applied at the beginning of the experiment. Although most N was recovered in the 0-1.5 m soil layer there was some evidence of movement of N below this depth. The results showed that trash supplies N slowly and in small amounts to the succeeding crop in wet tropics sugarcane growing areas regardless of trash placement (on the soil surface or incorporated) or soil type, and so N mineralisation from a single trash blanket is not important for sugarcane production in the wet tropics.Nutrient Cycling in Agroecosystems 01/2006; · 1.42 Impact Factor
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ABSTRACT: Silicon (Si) confers increased disease resistance and nutritional benefits for both sugarcane and rice. Sugarcane is the primary crop grown in the Everglades Agricultural Area (EAA) in south Florida, USA, and production inputs routinely include Si fertilization. Soil testing for Si is based on a 0.5 N acetic acid extraction procedure that was developed for rice grown on the organic and mineral soils found in the EAA. The objective of this study was to compare a Florida based acetic acid extraction protocol with the sodium acetate buffer method used in Japan and Korea, and the 0.01 M calcium chloride method used in Australia. The three procedures were used to extract Si from soil samples collected from 31 countries, collectively representing 137 mineral soils. The collectors were asked to sample Oxisols, Ultisols, and coarse textured soils. A subset of the soil collection was classified as deficient (requiring Si fertilization for rice and/or sugarcane), based on published critical soil-test Si values specific to each extraction procedure. The sodium acetate buffer extracted the greatest amounts of Si (0 to 509 mg kg), followed by acetic acid (1 to 239 mg L) and calcium chloride (3 to 109 mg kg). Acetic acid and sodium acetate buffer soil-test Si values were fairly well correlated (r=0.77) and both methods performed well across a wide range of soils. Results with calcium chloride were less well correlated with acetic acid (r=0.73) and were poorly related to sodium acetate buffer (r=0.57). When considering only the subset of soils testing at or below the critical value, the correlation between acetic acid and sodium acetate buffer extractions was improved (r=0.84). This research was supported by the Florida Agricultural Experiment Station and approved for publication as Journal series No. R-08790.Communications in Soil Science and Plant Analysis 08/2006; 34(15&16)(pp. 2059–2071 (2003)):2059-2071. · 0.42 Impact Factor
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ABSTRACT: The siderurgy slag, as acidity correction material with reaction slower than the limestone, can benefit long-term crops such as sugar cane. This work had as objective to evaluate the response of the sugarcane during five cycles of production as function of the application of siderurgy slag. The work was carried out at Ituverava (SP), in a Red Yellow Latosol (V=26%). The experimental design was randomized blocks in factorial scheme 2 x 4, with four replications. The factors consisted of two corrective materials (slag of siderurgy and limestone) at four levels: 0; 1.23, 2.52 and 3.8 t ha-1 equivalent of CaCO3. The cane stalk production was evaluated throughout five cycles of culture (harvests 1998/1999 up to 2002/2003), and soil sampling (0-20 cm) and base saturation evaluation being performed in the first four cycles. The slag of siderurgy and the limestone were similar in the correction of the acidity of the soil, along sugarcane cycles. The largest accumulated cane stalk production was associated to the soil base saturation near 60% and 70% when using limestone and slag of siderurgy, respectively.Bragantia 12/2008; 68(2):381-387.