【摘要】 1978～1987年设置长期定位田间试验,观测施用有机肥和无机氮肥对土壤肥力的影响。试验表明,施用有机肥和无机氮肥对土壤肥力因素有良好的影响,有机肥和无机氮肥配合施用的效果最好。施用有机肥或无机氮肥都能增加土壤有机碳含量,而有机碳含量与土壤容重呈显著负相关(r=-0.812 n=9).土壤有机碳与土壤腐殖质含量(r=0.815 n=9)、腐殖质碳量与田间持水量(r=0.922 n=9)之间均呈显著正相关。更多还原

【Abstract】 The experiment was carried out on the experimental station of Laiyang Agricultural College with nine treatent, three neplications and two succeeding crops in one year (winter wheat--maize).The results were as follows. Applying either organic fertilizer or inorganic nitrogen fertilizer could increase organic carbon in the soil.The most effective was the combination of both kinds of fertilizers.Statistical analysis revealed that there was a negative couelation between organic carbon content in the soil and soil bulk density (r=-0.812, n=9); significant positive correlations between soil organic carbon and humus contend (r=0.815, n=9), and between humus content and field water-holding capacity (r=0.922, n=9)更多还原