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Loblolly Pine Needles Retain Urea Fertilizer that Can Be Lost as Ammonia

^a Dep. of Crop and Soil Sciences, 3111 Miller Plant Sciences. Bldg., University of Georgia, Athens, GA 30602
^b Warnell School of Forest Resources, University of Georgia, Athens, GA 30602

View larger version (25K): [in a new window]   Fig. 1. Temperature and relative humidity of the sweep air circulating over samples in an incubator (bars are standard errors; CRH = critical relative humidity for urea).

View larger version (26K): [in a new window]   Fig. 2. Effect of amount of simulated rainfall and number of diurnal humidity cycles on the percentage of urea leached from (a) new needles, (b) old needles, and (c) Oe horizon (bars are standard deviations).

View larger version (22K): [in a new window]   Fig. 3. Air temperature and relative humidity during exposure of new pine needles to field conditions (CRH = critical relative humidity for urea).

View larger version (22K): [in a new window]   Fig. 4. (a) Effect of cumulative, simulated rainfall on the percentage of urea leached from new pine needles and Oe horizon. (b) Ammonia loss from new pine needles and Oe horizon after being leached by 180 mm of simulated rainfall (bars are standard deviations).