Abstract
Abstract Very little information is available regarding the plant nutrient value of filter press mud (FPM) for sugarcane. Yield increases of sugarcane as a result of FPM application have been inconsistent. Therefore eight field experiments were conducted to study the effect of FPM and NPK fertilizer, and their interaction on the yield and sucrose content of sugarcane ( Saccharum officinarum L.). There were four plant cane and four ratoon experiments conducted over 2 years on seven sites. These included one experiment in which the residual effect of FPM after 1 year was studied. A split plot design was used with FPM on main plots (rates were 0, 20, and 40 metric tons/ha or 0 and 34 metric tons/ha dry wt with two or four replications), and N, P, and K fertilizer rates on subplots (two or four replications). The rates of fertilizers were as follows: N = 0, 94, and 188 kg/ha or 47, 94, and 141 kg/ha; P = 0, 45, and 90 kg/ha or 0 and 45 kg/ha; K = 0 and 112 kg/ha. Filter press mud increased the yield of cane in six experiments including the residual FPM experiment. Yield increases were higher in plant than in ratoon cane. Nitrogen increased the yield of cane in all experiments and in five experiments, rates higher than 94 kg N/ha, the standard practice, gave higher yield. The response of sugarcane to N‐fertilizer was more related to the texture of the soil (r = −0.79) than N‐content of the soil. Phosphorus increased the yield in seven experiments. Potassium gave a response in two out of five experiments. FPM ✕ P was the most interesting interaction and occurred in six experiments. This interaction reflected the inter‐changeability of FPM at the rates studied with P‐fertilizer. Other significant interactions were FPM ✕ N ✕ K, FPM ✕ N ✕ P. Filter press mud also improved the quality of the cane in four experiments while P‐fertilizer improved it in three. On basis of these results, the following is recommended: 1) No P‐fertilizer need be applied where FPM has been applied in quantities as high as 20 metric tons/ha dry wt basis, 2) ratoons following the plant cane may need P‐fertilizer but possibly in much smaller amounts than normal, particularly if FPM rates are high, and 3) rates greater than 94 kg/ha are recommended particularly in the coarser textured soils.
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Claims 14
Claim · model-written summary
Filter press mud increased cane yield in six experiments, including a residual-effect experiment.
- Taxon
- sugarcanee1
- Treatment
- Filter press mude0
- Outcome
- yield of canee0
- Direction
- increasede0
- Value
- six experimentse0
Not reportedComparator
Verbatim
e0“Filter press mud increased the yield of cane in six experiments including the residual FPM experiment.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Yield increases from filter press mud were higher in plant than ratoon cane.
Verbatim
e0“Yield increases were higher in plant than in ratoon cane.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Nitrogen increased cane yield in all experiments.
Not reportedComparator
Verbatim
e0“Nitrogen increased the yield of cane in all experiments”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
In five experiments, nitrogen rates above 94 kg N/ha gave higher cane yield.
Verbatim
e0“in five experiments, rates higher than 94 kg N/ha, the standard practice, gave higher yield.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
The nitrogen fertilizer response related more to soil texture than soil nitrogen content.
- Taxon
- sugarcanee0
- Treatment
- N‐fertilizere0
- Outcome
- response of sugarcanee0
- Value
- r = −0.79e0
- Comparator
- N‐content of the soile0
Not reportedDirection
Verbatim
e0“The response of sugarcane to N‐fertilizer was more related to the texture of the soil (r = −0.79) than N‐content of the soil.”
Claim · model-written summary
Phosphorus increased cane yield in seven experiments.
Not reportedComparator
Verbatim
e0“Phosphorus increased the yield in seven experiments.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Potassium produced a response in two of five experiments.
Not reportedComparatorDirection
Verbatim
e0“Potassium gave a response in two out of five experiments.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
The filter press mud by phosphorus interaction occurred in six experiments and indicated interchangeability.
Verbatim
e0“FPM ✕ P was the most interesting interaction and occurred in six experiments. This interaction reflected the inter‐changeability of FPM at the rates studied with P‐fertilizer.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Filter press mud by nitrogen by potassium and filter press mud by nitrogen by phosphorus interactions were significant.
Verbatim
e0“Other significant interactions were FPM ✕ N ✕ K, FPM ✕ N ✕ P.”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Filter press mud improved cane quality in four experiments.
- Taxon
- sugarcanee1
- Treatment
- Filter press mude0
- Outcome
- quality of the canee0
- Direction
- improvede0
- Value
- four experimentse0
Not reportedComparator
Verbatim
e0“Filter press mud also improved the quality of the cane in four experiments”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
Phosphorus fertilizer improved cane quality in three experiments.
Not reportedComparator
Verbatim
e0“P‐fertilizer improved it in three.”
e1“quality of the cane”
e2“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
The authors recommend omitting phosphorus fertilizer when filter press mud is applied at 20 metric tons per hectare dry weight.
Verbatim
e0“No P‐fertilizer need be applied where FPM has been applied in quantities as high as 20 metric tons/ha dry wt basis”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
The authors suggest ratoons following plant cane may need less phosphorus fertilizer than normal, especially at high filter press mud rates.
Verbatim
e0“ratoons following the plant cane may need P‐fertilizer but possibly in much smaller amounts than normal, particularly if FPM rates are high”
e1“sugarcane ( Saccharum officinarum L.)”
Claim · model-written summary
The authors recommend nitrogen rates above 94 kg/ha, particularly on coarser textured soils.
Verbatim
e0“rates greater than 94 kg/ha are recommended particularly in the coarser textured soils”
e1“sugarcane ( Saccharum officinarum L.)”
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See all 57 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.