TY - JOUR
AU1 - Izaurralde, R. C.
AU2 - Kissel, D. E.
AU3 - Swallow, C. W.
AB - To describe how soil properties affect anhydrous ammonia (NH3) retention, more accurate laboratory methods are needed to apply anhydrous NH3 in a line source (band) and sample the resulting NH3 retention zone. We developed and tested a line‐source NH3 applicator and a method for sampling the resulting NH3 retention zone. The applicator has a system of flow control valves and a flow meter to regulate the rate of NH3 flow to an injection needle. The needle is held stationary while NH3 is injected into a box of soil. The box of soil moves on a platform whose speed can be varied to change the NH3 application rate. The soil sampling method was to sequentially remove concentric cylindrical cores of increasing radii centered around the line of NH3 injection. Ammonia was applied to two soils with different NH3 retention capacities and the resulting NH3 retention zones were sampled. Accurate NH3 deliveries were possible with the system described. The coefficient of variation of the platform speed was <1%. The sampling method gave N recoveries that ranged between 95 to 99%. By using the concentric ring sampling method, ammoniacal‐N concentrations of duplicate retention zones at different distances from the injection line were not significantly different. Thus, the applicator and soil sampling method proved to be both accurate and precise for studying NH3 retention zones in soil.
TI - Laboratory Apparatus to Apply and Sample Anhydrous Ammonia in Bands
JF - Soil Science Society of America Journal
DO - 10.2136/sssaj1986.03615995005000040021x
DA - 1986-07-01
UR - https://www.deepdyve.com/lp/wiley/laboratory-apparatus-to-apply-and-sample-anhydrous-ammonia-in-bands-bSPcQCre7l
SP - 932
EP - 936
VL - 50
IS - 4
DP - DeepDyve
ER -