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Nitrogen Fertilizer Movement in the Soil as Influenced by Nitrogen Rate and Timing in Irrigated Wheat

^a Plant Sciences Dep., Univ. of Arizona, Tucson, AZ 85721 USA
^b 951 East 200 North, Provo, UT 84602 USA

View larger version (41K): [in a new window]   Fig. 1 Nitrogen fertilizer rate effect on soil Br- concentration as a function of depth for a clay loam and sandy loam soil in 1991 and 1992. Potassium bromide was applied at a rate of 11.3 g Br- m-2 at planting. The error bars represent the least significant difference at P = 0.05 (LSD0.05). The LSD is not significant if the error bar is followed by "ns" and significant if the error bar is followed by "*"

View larger version (28K): [in a new window]   Fig. 2 Bromide application timing effect on soil Br- concentration as a function of depth in 1991 and 1992 on a sandy loam soil. Potassium bromide was applied at a rate of 11.3 g Br- m-2 each application time. The error bars represent the least significant difference at P = 0.05 (LSD0.05). The LSD is not significant if the error bar is followed by "ns" and significant if the error bar is followed by "*"

View larger version (35K): [in a new window]   Fig. 3 Nitrogen fertilizer rate effect on amount of 15N recovered in the soil as a function of depth for a clay loam and sandy loam soil in 1991 and 1992. The error bars represent the least significant difference at P = 0.05 (LSD0.05). The LSD is not significant if the error bar is followed by "ns" and significant if the error bar is followed by "*"

View larger version (29K): [in a new window]   Fig. 4 Nitrogen fertilizer application timing effect on amount of 15N recovered in the soil as a function of depth in 1991 and 1992 on a sandy loam soil. The error bars represent the least significant difference at P = 0.05 (LSD0.05). The LSD is not significant if the error bar is followed by "ns" and significant if the error bar is followed by "*"