In the first year of 2 separate series of field experiments investigating the fate of sulphur (S) applied as radioactive gypsum fertiliser, total mean recovery (soil and pasture) from 8 sites ranged from 30 to 99. Harvested pasture recovery at each site comprised a small proportion of total recovery and varied from 6 to 33, depending on stage of pasture improvement, pasture yield, time of fertiliser application, and fertiliser rate. In the absence of re-topdressing in the second year, harvested pasture recovery of S in gypsum fertiliser applied the previous year was in general lower than that in the first year and ranged from 2 to 11. Over a 2-year period, total recovery of fertiliser S by harvested pasture was 10–40 of the initial application of 45 kg S/ha. The significance of the total recovery values was considered in relation to the effectiveness of fertiliser S applied as gypsum.
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机译：在调查硫磺作为放射性石膏肥料的命运的2个独立系列田间试验的第一年，8个地点的总平均回收率（土壤和牧场）从30%到99%不等。每个地点收获的牧草回收率仅占总回收率的一小部分，从6%到33%不等，具体取决于牧场改良阶段、牧场产量、施肥时间和施肥率。在第二年没有追肥的情况下，上一年施用石膏肥中收获的牧草S回收率普遍低于第一年，在2%-11%之间。在 2 年的时间里，收获的牧场对肥料 S 的总回收率为初始施用量 45 kg S/ha 的 10-40%。考虑了总回收率值与施用石膏肥料 S 的有效性相关的意义。
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