Sugarcane yield response to potassium fertilization as related to extractable soil potassium on florida mineral soils

Abstract A polyhouse study was conducted to evaluate the relative effectiveness of different micronutrient fertilizer formulation and application methods on wheat, pea and canola, as indicated by yield response and fate of micronutrients in contrasting mineral soils. The underlying factors controlling micronutrient bioavailability in a soil–plant system were examined using chemical and spectroscopic speciation techniques. Application of Cu significantly improved grain and straw biomass yields of wheat on two of the five soils (Ukalta and Sceptre), of which the Ukalta soil was critically Cu deficient according to soil extraction with DTPA. The deficiency problem was corrected by either soil or foliar application of Cu fertilizers. There were no significant yield responses of pea to Zn fertilization on any of the five soils. For canola, soil placement of boric acid was effective in correcting the deficiency problem in Whitefox soil, while foliar application was not. Soil extractable Cu, Zn, and B concentration in post-harvest soils were increased with soil placement of fertilizers, indicating that following crops in rotation could benefit from this application method. The chemical and XANES spectroscopic speciation indicates that carbonate associated is the dominant form of Cu and Zn in prairie soils, where chemisorption to carbonates is likely the major process that determines the fate of added Cu and Zn fertilizer.

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ASSESSMENT OF AVAILABLE SOIL SULPHUR IN AN 35S GROWTH CHAMBER EXPERIMENT

Canadian Journal of Soil Science ◽

10.4141/cjss74-040 ◽

1974 ◽

Vol 54 (3) ◽

pp. 309-315 ◽

Cited By ~ 23

Author(s):

J. R. BETTANY ◽

J. W. B. STEWART ◽

E. H. HALSTEAD

Keyword(s):

Organic Matter ◽

Soil Organic Matter ◽

Growth Chamber ◽

Yield Response ◽

Laboratory Studies ◽

Organic S ◽

Chamber Experiment ◽

Extractable Soil

Growth chamber and laboratory studies of four selected soils differing in C:N:S ratios and the percentage of total S present as HI-reducible S in the soil organic matter showed that: (1) the yield response of alfalfa to applied S occurred when the 0.01 M CaCl2-extractable soil SO4—S was less than 3.3 μg/g, (2) mineralization of soil organic S was unaffected by the addition of 25 μg S/g to the soils, and (3) the amount of S mineralized was not directly related to the quantity of total S, HI-S or the percentage of total S present as Hi-reducible S. It was noted that the largest amount of S mineralized occurred from the soil with the lowest C:N:S ratios.

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Yield response of wheat to nitrogen and potassium fertilization

Pure and Applied Biology ◽

10.19045/bspab.2016.50109 ◽

2016 ◽

Vol 5 (4) ◽

Author(s):

Muhammad Adnan

Keyword(s):

Yield Response ◽

Potassium Fertilization

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On the copper content of some northern conifers

Canadian Journal of Botany ◽

10.1139/b75-177 ◽

1975 ◽

Vol 53 (15) ◽

pp. 1453-1456 ◽

Cited By ~ 12

Author(s):

Earl L. Stone ◽

Victor R. Timmer

Keyword(s):

New York ◽

New Brunswick ◽

Fine Roots ◽

Copper Content ◽

Long Island ◽

Red Maple ◽

Normal Range ◽

Mineral Soils ◽

Range Of Values ◽

Extractable Soil

New analyses of pine, spruce, fir, larch, and red maple tissue from the Tantramar Copper Swamp, New Brunswick, fail to confirm the exceptional high copper contents previously reported from this location. Foliar contents did not differ from those of nearby controls, and contents in 1st- and 2nd-year twigs were only two to three times higher than in controls, still within the normal range of values in the literature. In contrast, bulk samples of fine roots from the swamp contained over 2000 ppm Cu. Parallel comparisons of hemlock growing on Cu-enriched mineral soils from Long Island, New York, revealed that root Cu increased linearly with extractable soil content, whereas foliar Cu was unaffected. Thus, it appears that roots and twigs may be better indices of plant Cu status than foliage.

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RELEASE OF NON-EXCHANGEABLE SOIL POTASSIUM BY RESIN-EQUILIBRATION AND ITS SIGNIFICANCE FOR CROP GROWTH

Canadian Journal of Soil Science ◽

10.4141/cjss62-035 ◽

1962 ◽

Vol 42 (2) ◽

pp. 266-272 ◽

Cited By ~ 13

Author(s):

T. E. Barber ◽

B. C. Matthews

Keyword(s):

Linear Regression ◽

Ammonium Acetate ◽

Cation Exchange Resin ◽

Yield Response ◽

Exchangeable Potassium ◽

Quadratic Regression ◽

Potassium Fertilizer ◽

Crop Response ◽

Soil Potassium ◽

The Difference

The non-exchangeable potassium released by soil after equilibration with cation-exchange resin was determined by extraction of the mixture with neutral ammonium acetate at room temperature and compared with a similar extraction in the absence of resin. The difference obtained following a 2-day equilibration period was called moderately-available potassium.Simple linear regression of yield on exchangeable potassium or exchangeable plus moderately-available potassium accounted for only 16 and 27 per cent respectively of the variability in yield response of corn, wheat, oats and potatoes to potassium fertilizer in the field. Multiple linear regression of yield on exchangeable and moderately-available potassium accounted for an average of 37 per cent of the variation in crop response; but a multiple quadratic regression of Log (100-per cent yield) on exchangeable and moderately-available potassium accounted for an average of 56 per cent of the variability in Log (100-per cent yield). Multiple quadratic regression of absolute yield or per cent yield on exchangeable and moderately-available potassium accounted for 46 and 50 per cent, respectively, of the variability in crop response to potassium fertilizer.

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