Weed Management in FL Sugarcane Everglades REC, Belle Glade, FL
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1 Weed Management in FL Sugarcane Everglades REC, Belle Glade, FL
2 Outline General sugarcane information Sugarcane production Planting Harvest Weed management Factors that influence management Chemical Mechanical Cultural
3 FL Sugar Approximately 400,000 acres of sugarcane Grown by FL Crystals, US Sugar, and Sugar Cane Growers Cooperative of FL
4 Sugarcane biology Sugarcane is a giant perennial grass (Poaceae) Tribe: Adropogoneae Commercial clones are typically hybrids of Saccharum officinarum L. and a combination of S. barberi, S. robustum, S. sinese, and spontaneum
5 Growing season Planted September to December Grows for approximately one year between harvests Harvest season runs from October through March Cane that will be replanted (successively) is harvested first
6 Sugarcane growth Grows rapidly in the summer period of warm temperatures and high rainfall Matures, ripens, and is easily harvested during the cool, dry winters The lake provides a winter warming effect
7 Soils About 90% is grown on muck soils ~ 70 to 90% organic matter and do not require N fertilizer Remainder is grown on sand soils (1-3% OM)
8 Planting Propagated with vegetative cuttings Planted by both hand and machine 5 ft row spacing
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11 Sugarcane harvest Most sugarcane in FL is burned prior to harvest to remove leaf material Yields range from 20 to over 100 tons/acre Yields typically decrease with each ratoon crop The average is around 45 tons/acre
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14 Green cane harvest As the population of S. FL grows, air quality becomes a larger issue Many sugarcane producing countries are phasing out burning The impact of GCH on the FL production system is unknown GCH results in a heavy residue layer (5-15 tons/acre)
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16 Weed management overview Most growers utilize an integrated approach (primarily chemical and mechanical) Sugarcane is relatively competitive and somewhat forgiving South FL environment is ideal for many tropical and sub-tropical weed species
17 Factors that influence weed management Virtually a monoculture crop Row spacing Crop age Minor use crop High organic matter soils Corporate mentality (sugarcane prices) and tradition
18 Monoculture Crop rotation is a valuable tool for weed management The majority sugarcane is replanted every 3 years Only a small percentage of the fields are rotated to vegetables or left fallow
19 Row spacing Sugarcane is planted on 5 ft rows Although a competitive crop, grows slowly at temperatures below 70 F Results in bare ground following planting and harvest until ~March Cultivars vary in their canopy architecture
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22 Crop age Yields typically decrease each year Influences the crop value and the amount growers are willing to spend for weed control Additionally, some growers do not apply herbicides to plant cane Weed pressure typically increases
23 Minor use crop Although a major crop in south Florida, sugarcane is a minor use crop in the US and worldwide Consequently, there are a limited number of registered herbicides Little incentive for new product research in current ag chemical industry climate
24 Muck soils High organic matter (70-90%) has considerable effect on duration of weed control with PRE herbicides Despite high use rates, control can last less than 4-6 weeks High rates increase likelihood of crop injury Results in a reluctance to use PRE herbicides
25 Corporate mentality and tradition Weed control decisions are often made by accountants Results in a fixed budget and plan for weed control Goal is often quantity of acres treated rather than quality Traditional reliance and overuse of on tillage
26 Envoke + Asulox applied to 4-5 inch tall crabgrass and fall panicum Application timing applied 13 days later applied 20 days later
27 Chemical weed control Both PRE and POST herbicides are used PRE treatments are typically POST to the crop Most herbicide applications are banded over the row Mainly older chemistries Short residual with PRE herbicides
28 PRE herbicides Atrazine is the backbone of most weed control programs Used both PRE and POST Applied at 3-4 lbs per acre, and 1 to 2 times per season Typically last 3-5 weeks Heavy reliance on triazine herbicides
29 POST herbicides Asulam is used extensively for grass weed control Because of cost it is often applied late to insure only 1 application before canopy closure Trifloxysulfuron, halosulfuron for nutsedge control 2,4-D for broadleaf weed control
30 Mechanical weed control Varies depending on plant cane or ratoon cane Plant cane-scratchers are used over the top of the cane and tines are removed as the can gets larger Ratoon cane-disk cultivators are used for weed control in row middles
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32 Cultural weed control Selection of cultivars that have quick canopy closure Seed cane from clean fields Control of weeds on field borders and ditch banks
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