Abstract
Abstract Polyhalite (PYH), (K 2 SO 4 ·MgSO 4 ·2CaSO 4 ·2H 2 O), contains four nutrients of great importance to sugarcane (Saccharum spp.), but has lower water solubility than traditional K fertilizers. Two studies were conducted to determine if PYH fertilizer (11.6% K) promoted sugarcane response comparable to other K fertilizers on highly weathered, acidic Oxisol soils in Brazil. A pot study compared PYH with potassium chloride (KCl, 50% K) and potassium sulfate (K 2 SO 4 , 40% K and 17% S), both amended to the same Ca, Mg, and S contents, applied at five rates ranging from 0 to 166 kg K ha −1 in limed and unlimed soil. A field study evaluated PYH with KCl applied in a 5–30–10 blend at planting followed by sidedress applications of K as PYH or KCl in the establishment year and two ratoon crops. In the pot study, there were minimal effects of fertilizer source and application rate on early growth in sugarcane while liming was detrimental. Uptake of K in the biomass was linear and similar among fertilizer sources. PYH increased S uptake and soil tests compared to KCl and K 2 SO 4 . In the field study, KCl and PYH had similar sugarcane yield and quality with K uptake in both exceeding K applied and PYH increased S uptake and soil test SO 4 –S. These studies confirm nutrient release from PYH to sugarcane was adequate and comparable to KCl and K 2 SO 4 , with some effect of PYH on nutrient uptake and soil test that did not affect sugarcane yield or quality.
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Claims 9
Claim · model-written summary
Fertilizer source and application rate had minimal effects on early sugarcane growth.
Verbatim
e1“In the pot study, there were minimal effects of fertilizer source and application rate on early growth in sugarcane while liming was detrimental”
Claim · model-written summary
Liming was detrimental to early sugarcane growth compared with unlimed soil.
Verbatim
e1“In the pot study, there were minimal effects of fertilizer source and application rate on early growth in sugarcane while liming was detrimental”
e7“applied at five rates ranging from 0 to 166 kg K ha −1 in limed and unlimed soil”
Claim · model-written summary
Uptake of K in the biomass was linear and similar among fertilizer sources.
Verbatim
e1“In the pot study, there were minimal effects of fertilizer source and application rate on early growth in sugarcane while liming was detrimental”
e2“Uptake of K in the biomass was linear and similar among fertilizer sources”
Claim · model-written summary
PYH increased S uptake and soil tests compared with KCl and K2SO4 in the pot study.
Verbatim
e1“In the pot study, there were minimal effects of fertilizer source and application rate on early growth in sugarcane while liming was detrimental”
e3“PYH increased S uptake and soil tests compared to KCl and K 2 SO 4”
Claim · model-written summary
In the field, PYH and KCl gave similar sugarcane yield and quality.
Verbatim
e4“In the field study, KCl and PYH had similar sugarcane yield and quality with K uptake in both exceeding K applied and PYH increased S uptake and soil test SO 4 –S”
Claim · model-written summary
Potassium uptake in the field exceeded the K applied.
Verbatim
e4“In the field study, KCl and PYH had similar sugarcane yield and quality with K uptake in both exceeding K applied and PYH increased S uptake and soil test SO 4 –S”
Claim · model-written summary
In the field, PYH increased S uptake and soil test SO4-S compared with KCl.
Verbatim
e4“In the field study, KCl and PYH had similar sugarcane yield and quality with K uptake in both exceeding K applied and PYH increased S uptake and soil test SO 4 –S”
Claim · model-written summary
Nutrient release from PYH to sugarcane was adequate and comparable to KCl and K2SO4.
Verbatim
e5“These studies confirm nutrient release from PYH to sugarcane was adequate and comparable to KCl and K 2 SO 4”
Claim · model-written summary
PYH had some effect on nutrient uptake and soil test but did not affect sugarcane yield or quality.
Verbatim
e6“some effect of PYH on nutrient uptake and soil test that did not affect sugarcane yield or quality”
e5“These studies confirm nutrient release from PYH to sugarcane was adequate and comparable to KCl and K 2 SO 4”
The same questions in other papers
lime · growth · Saccharum officinarum (sugarcane)Positive and negative results
3 papers in the same direction as this paper · 8 in the opposite direction
- no effect
- positive
- positive
8 papers more in this group
See all 12 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.