【摘要】 对河南省农田肥料钾资源投入数量和结构的演变状况进行了研究。结果表明 :1978年以前没有使用化学钾肥 ,到 1997年施用化学钾肥已占施钾总量的 4 1.9% ,但仅占化肥施入总量的 9.9% ,N∶P2 O5∶K2 O为 1∶0 .4 6 1∶0 .16 1;有机肥中钾资源丰富 ,但归还率不高 ,仅为 37.5 %。更多还原

【Abstract】 A study is made of the evolution of the input quantity and structure of the fertilizer potassium resource on farmland in Henan Province. The results show that no chemical potassic fertilizer was used before 1978, and chemical potassic fertilizer applied in 1997, made up 41.9% of the total potassium applied but only 9.9% of all the chemical fertilizers applied, giving a N∶P₂O₅∶K₂O ratio of 1∶0.461∶0.161. The potassium resource is rich in organic manures, but its return rate is not high, merely 37.5%, so there is great potential to be tapped for the utilization of the potassium element in organic manures.更多还原