【摘要】 将“冬小麦—夏玉米→花生”两年三熟制视为一系统整体 ,来研究 3种不同作物在轮作周期内的土壤养分限制因子。结果表明 ,在滦河三角洲沙区 ,“冬小麦—夏玉米→花生”的种植周期内 ,冬小麦的土壤养分限制因子序为N >K >Zn >Mn >P ,夏玉米的限制因子序为K >N >Zn >S >P ,花生的限制因子序为K >N >Mn>S >P。得出在滦河三角洲沙区 ,K和N是限制作物产量的最重要的土壤养分限制因子 ,否定了对该地区缺P富K的传统观念 ,重新肯定了施用钾肥的重要性。更多还原

【Abstract】 Winter wheat-summer maize-peanut” was first regarded as a planting system to study soil nutrient restriction factors of the three crops during the rotation period. The results indicated that during the rotation period in Luanhe delta, the nutrient restriction order for winter wheat was N>K>Zn>Mn>P, for summer maize was K>N>Zn>S>P, for peanut was K>N>Mn>S>P>. The experiment indicated that K and N was the main restriction factors, which negated the traditional concept that the area is abundant in K and inadequate in P. The experiment showed the great importance of the application of K once again.更多还原