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1 试验区基本情况试验区位于黑龙镇、唐枣公路以西的砂礓黑土区,区域高程在90.4～100.6m 之间,东高西低。试验区属北亚热带季风型大陆性气候,四季分明,光照充足,气候温和,无霜期长,降水量丰沛但年内年际变化较大,多年平均降水量为910.1mm。冬小麦生育期和秋作物生育期降水量分别占年水量的40%和60%。砂礓黑土质地粘重,耕作层为中壤—重壤土,而以重壤土居多,耕作层以下则为重壤—轻粘土。耕作层一般15～18cm,土层疏松,有机质含量少,大雨或漫灌后屑粒结构瓦解,干时变得板结开裂,湿时泥泞难耕。犁底层坚定紧密,孔隙度小通透性
1 Basic conditions of the pilot area The pilot area is located in the black sand area of the sand 礓 west of Heilong town and Tangzao highway. The regional elevation is between 90.4 and 100.6 meters and the east and west are low. The test area belongs to the northern subtropical monsoon type continental climate, with four seasons, abundant sunshine, mild climate, long frost-free period and rich rainfall but with large interannual variation during the year. The average annual precipitation is 910.1 mm. Precipitation in winter wheat and autumn crop growth period respectively accounted for 40% and 60% of the annual water volume. Sandy clayey black soil sticky, tillage for the soil - heavy loam, and heavy loam mostly, below the tillage layer is heavy soil - light clay. Tillage layer is generally 15 ~ 18cm, loose soil, organic matter content is less, after heavy rain or flooding debris disintegration of debris structure, become cracked dry cracking, wet muddy hard. Plow bottom firm, porosity small permeability