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黑土是我国东北重要的农业土镶,素以肥沃著称.黑龙江北部黑土开垦历史较短,有相当面积不施或仅施用少量肥料.为了解耕种制度的利弊,探索提高黑土肥力的途径,本研究着重探讨了黑土开垦后,在不施用有机肥料情况下,某些农业化学性质以及腐殖质组成与特性的变化规律.一、供试土壤及研究方法供研究的土壤试样为重壤质深厚黑土,采自黑龙江省嫩江县九三农场开垦不同年限的农田和相邻的荒地.这些田块相距不超过500米,有相似的地形条件.
Black soil is an important agricultural soil in northeast China and is known for its fertility.The history of cultivation of black soil in northern Heilongjiang Province is relatively short and no fertilizer is applied in a considerable area.In order to understand the advantages and disadvantages of the cultivation system and explore ways to improve the fertility of black soil, The changes of some agrochemical properties and the composition and characteristics of humus under the condition of no organic fertilizers were studied emphatically after the reclamation of black soil.First, the test soil and research methods The soil samples for research were heavy loam deep black soil, Nongsan County, Heilongjiang Province collected from nine three farm reclamation of different years of farmland and adjacent wasteland.These plots are not more than 500 meters apart, have similar topographical conditions.