The availability of nonexchangeable K in the soils was much higher so that soil K supplied sufficiently, ryegrass grew well and the dry biomass were much higher during the earlier stage of exhaustion.

 
  • 供試土壤耗竭前期非交換性鉀有效性高,供鉀量大;黑麥草生長(cháng)良好,生物量大。
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