Phosphorus load reductions under best management practices for sugarcane cropping systems in the Everglades Agricultural Area

Rice, Ronald W.; Izuno, Forrest T.; Garcia, Raymond M.

doi:10.1016/s0378-3774(01)00196-2

Cited by 41 publications

(17 citation statements)

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“…These soils were indeed sources of P to proximal aquatic systems as runoff in solution and as sediment-bound (Daroub et al 2003), which caused eutrophication of downgradient wetlands (Childers et al 2003). Phosphorus runoff from cultivated soil can range up to 8.9 kg P ha -1 yr -1 (Rice et al 2002), which is similar to leaching losses of 8.2 kg P ha -1 yr -1 (Sanchez and Porter 1994). Since fertilized soil under sugarcane had the same total P stocks as unfertilized soil under turfgrass and cypress, long-term fertilization did not appear to enhance total P storage, although it did alter the distribution between chemical fractions.…”

Section: Comparison Of P Distribution Between Land Usesmentioning

confidence: 99%

Soil phosphorus stocks and distribution in chemical fractions for long-term sugarcane, pasture, turfgrass, and forest systems in Florida

Wright

2008

Nutr Cycl Agroecosyst

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Phosphorus distribution and stability in soils of the Everglades Agricultural Area (EAA) of south Florida is important because of changing land uses. We investigated the effects of land use on P distribution in the soil profile and between chemical fractions for a histosol of the Florida Everglades. Labile, Fe-Al bound, Ca-bound, humic-fulvic acid, and residual P pools in 0-15, 15-30, and 30-45 cm depths were determined for drained soils planted to sugarcane (Saccharum sp.) for 50 yr, pasture for 100 yr, turfgrass for 60 yr, and forest for 20 yr. The P concentrations of all chemical fractions decreased with depth in the profile, indicating accumulation in surface soil resulting from oxidation and fertilization. Trends in P distribution between chemical fractions were similar between land uses. Labile P comprised less than 1% of total P. Fe-Al bound P averaged 2.9% of the total P for turfgrass and forest, but 11.4 and 9.6% for sugarcane and pasture. Increasing soil disturbance and long-term fertilization increased P allocation to inorganic fractions, as Ca-bound P contained 49% of total P for sugarcane but 28% for other land uses. Total P stocks in the soil profile (0-45 cm) averaged 1,323, 2,005, 2,294, and 2,317 kg P ha -1 for pasture, sugarcane, turfgrass, and forest, respectively. Under current land uses P in organic fractions represents an unstable pool since the soil is prone to oxidation under drained conditions. In contrast, P sequestered in inorganic fractions is more stable under current land uses, thus sugarcane cultivation and incorporation of bedrock CaCO 3 into surface soil by tillage will enhance long-term P sequestration.

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Section: Comparison Of P Distribution Between Land Usesmentioning

confidence: 99%

Soil phosphorus stocks and distribution in chemical fractions for long-term sugarcane, pasture, turfgrass, and forest systems in Florida

Wright

2008

Nutr Cycl Agroecosyst

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“…(Snyder and Davidson, 1994). Control of P discharge often results in shallow water tables on sugarcane fields because EAA farm managers control P movement to public canals primarily by reducing the quantity and rate of water discharged from their farms (Rice et al, 2002). A central focus of management practices that reduce P discharge is to allow water tables to drop primarily due to evapotranspiration and seepage and less from pumping to public canals (Daroub et al, 2002).…”

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Sugarcane Responses to Water‐Table Depth and Periodic Flood

Glaz

Morris

2010

Agronomy Journal

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Sugarcane (Saccharum spp.) is exposed to periodic fl oods and shallow water tables in Florida due to practices that reduce P discharge to the Everglades. Th is study examined the yields and juice quality of four sugarcane cultivars (CP 88-1762, CP 89-2143, CP 89-2376, and CP 96-1252) maintained at constant water-table depths near 20 (20CWT) and 45 cm (45CWT) and with periodic summer fl ooding. Prescribed lysimeters were fl ooded for the fi rst 7 d of fi ve, fi ve, and four 21-d cycles in 2005 (plant-cane crop), 2006 (fi rst-ratoon crop), and 2007 (second-ratoon crop), respectively. Th ese treatments generally remained fl ooded during the next 7 d while they received no irrigation or drainage, and were drained to 20 (20FWT) or 45 cm (45FWT) for the fi nal 7 d of each cycle. Water treatment aff ected CRS only in the plant-cane crop, where 45CWT had lower CRS than 20CWT, 20FWT, and 45FWT.Yields of cane and sucrose of CP 89-2143 were least aff ected by water treatments. Reductions in cane and sucrose yields at a 20 compared with a 45 cm water-table depth were common for the other three cultivars, but yields under the 20CWT vs. 20FWT or 45CWT vs. 45FWT treatments were generally similar. Th ese results suggest that sugarcane roots function well in fl ood for up to 14 d, but do not grow well into saturated soil. Th is provides new options for sustaining high yields of sugarcane exposed to shallow water tables and fl oods; verifi cation of root responses could enhance strategies to sustain yields while reducing P discharge.

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“…Best management practices to reduce P discharge from the EAA often include strategies to reduce quantities and rates of pumping water from agricultural fields (Rice et al, 2002). Therefore, P export to the Everglades could be reduced by allowing high water tables and floods in sugarcane to descend more by evapotranspiration and less by pumping.…”

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Periodic Flooding and Water Table Effects on Two Sugarcane Genotypes

2004

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et al., 1998). Some EAA fields had as much as 300 cm of soil above the limestone bedrock when they were Sugarcane (Saccharum spp.) in Florida is increasingly exposed to first drained and used for agriculture. Depth of soil to periodic floods and high water tables for extended durations. We bedrock varies, but a small number of sugarcane fields evaluated the effects of periodic flooding, followed by drainage, on morphological characteristics and cane and sugar yields of two sugar-now have less than 40 cm of soil (Shih et al., 1998). cane genotypes. From 2000-2002, experiments were conducted in Second, for every centimeter of rainfall, the water in lysimeters filled with Pahokee muck soil. Flooding was imposed for the soil profile of EAA Histosols rises about 10 cm 7 d during five, nine, and nine 21-d cycles in 2000, 2001, and 2002, (Glaz et al., 2002). Finally, there are regulated and volrespectively. Cycles commenced when sugarcane leaves covered the untary limits on pumping from farm ditches to public rows and were discontinued in mid-October. Water table depths durcanals as a means of reducing P discharge to the natuing the 14-d drainage period of each cycle were 16, 33, or 50 cm. A ral Everglades. fourth treatment was maintained continuously at a 50-cm water table The issues of soil subsidence and P discharge also depth. Genotype CP 95-1429 yields were not affected by water table provide incentives to maintain yields under high water or flooding. For CP 95-1376 in periodic-flooding treatments, lowering tables and periodic flooding. The primary cause of subsithe water table in 1-cm increments increased cane and sugar yields by 0.16 and 0.02 kg m Ϫ2 , respectively, in 2000 and 0.25 and 0.03 kg dence in the EAA is microbial oxidation (Tate, 1980). m Ϫ2 , respectively, in 2001. Water table depth during drainage did not The factor that most influences the rate of microbial affect CP 95-1376 yields in 2002, perhaps because of a longer duration oxidation is depth of water table in the soil profile. between planting and initial flooding in 2002. Each day of flooding Therefore, the rates of oxidation and subsidence are reduced cane and sugar yields of CP 95-1376 by 0.17 and 0.02 kg m Ϫ2 , directly proportional to the depth of the water table. respectively, in 2000 and by 0.21 and 0.03 kg m Ϫ2 , respectively, in Halving the distance between the water table and the 2002. Flooding might not have reduced yields of CP 95-1429 becausesoil surface has been shown to halve the rate of subsiof its ability to form aerenchyma in the stalks before exposure to dence (Snyder et al., 1978).flooding. Such genotypes should be able to tolerate flooding for at

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Phosphorus load reductions under best management practices for sugarcane cropping systems in the Everglades Agricultural Area

Cited by 41 publications

References 5 publications

Soil phosphorus stocks and distribution in chemical fractions for long-term sugarcane, pasture, turfgrass, and forest systems in Florida

Soil phosphorus stocks and distribution in chemical fractions for long-term sugarcane, pasture, turfgrass, and forest systems in Florida

Sugarcane Responses to Water‐Table Depth and Periodic Flood

Periodic Flooding and Water Table Effects on Two Sugarcane Genotypes

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