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Rice Response to Granular Zinc Sources Varying in Water-Soluble Zinc

^a Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 1366 West Altheimer Drive, Fayetteville, AR 72704
^b Dep. of Crop, Soil, and Environmental Sciences, Univ. of Arkansas, 115 Plt. Sci. Bldg., Fayetteville, AR 72701
^c Agricultural Statistics Lab., Univ. of Arkansas, Fayetteville, AR 72701
^d Rice Research and Extension Center, Univ. of Arkansas, P.O. Box 351, Stuttgart, AR 72160

View larger version (33K): [in a new window]   Fig. 1. Predicted aboveground dry matter accumulation of rice at the midtillering stage as affected by Zn fertilizer source and application rate during 2000 at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC). For reference, the mean dry matter accumulations for the unfertilized controls (0 kg Zn ha–1) are shown as . For the RREC, mean dry matter values are shown as • for zinc sulfate 31% Zn (ZnSul31), for zinc lignosulfonate 10% Zn (ZnLig10), for zinc oxysulfate 20% Zn (ZnOxy20), and for zinc oxysulfate 36% Zn (ZnOxy36). For the PTBS, standard errors were 20.1 for intercept and 1.8 for linear coefficient. For the RREC, standard errors were 38.4 for intercept, 9.6 for linear coefficient, and 0.47 for the quadratic coefficient.

View larger version (39K): [in a new window]   Fig. 2. Predicted tissue Zn concentration of rice at the midtillering stage as affected by Zn fertilizer source and application rate during 2000 at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC). For reference, the dashed horizontal line (20 mg Zn kg–1) represents the critical Zn concentration. Mean Zn concentrations are shown as for the unfertilized control (0 kg Zn ha–1), • for zinc sulfate 31% Zn (ZnSul31), for zinc lignosulfonate 10% Zn (ZnLig10), for zinc oxysulfate 20% Zn (ZnOxy20), and for zinc oxysulfate 36% Zn (ZnOxy36). For the PTBS, standard errors were 1.5 for intercept and 0.08 for linear coefficient. For the RREC, standard errors were 1.6 for intercept and 0.14 for linear coefficient.

View larger version (35K): [in a new window]   Fig. 3. Predicted grain yield of rice as affected by Zn fertilizer source and application rate during 2000 at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC). For reference, the mean grain yields for the unfertilized controls (0 kg Zn ha–1) are shown as . For the RREC, mean grain yields are shown as • for zinc sulfate 31% Zn (ZnSul31), for zinc lignosulfonate 10% Zn (ZnLig10), for zinc oxysulfate 20% Zn (ZnOxy20), and for zinc oxysulfate 36% Zn (ZnOxy36). For the PTBS, standard errors were 209 for intercept, 52.2 for linear coefficient, and 2.6 for quadratic coefficient. For the RREC, standard errors were 270 for intercept, 67.2 for linear coefficient, and 3.3 for quadratic coefficient.

View larger version (26K): [in a new window]   Fig. 4. The relationships between water-soluble Zn application rate with aboveground Zn uptake by rice at the midtillering growth stage for studies conducted in 2000 at the Pine Tree Branch Station (PTBS) and Rice Research Extension Center (RREC).