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研究表明 :在当土壤中速效磷和速效钾含量处于富磷和富钾状态时 ,追施磷肥增产不明显 ,追施钾肥反而略有减产
The results showed that when available phosphorus and available potassium were in the state of phosphorus enrichment and potassium enrichment, the yield increase of topdressing phosphate fertilizer was not obvious, while that of topdressing potassium fertilizer decreased slightly