砂礓黑土地是南阳市主要耕作土壤之一,全市有32.7万hm~2,占耕地总面积的35.7%,是主要的低产土壤。深入研究这种土攘的灌排特点,探讨适宜的灌排技术并建立节水灌溉模式是省水利厅“八五”期间主要的水利科技攻关课题。南阳市鸭灌局灌溉试验站于1990年起开始承担这类项目的科研任 Sandy black land is one of the main cultivated soils in Nanyang City. There are 327,000 hm 2 in the whole city, accounting for 35.7% of the total cultivated land area, which is the main low-yielding soil. In-depth study of the characteristics of this bustling irrigation and drainage, to explore the appropriate irrigation and drainage technology and the establishment of water-saving irrigation mode is the provincial Water Resources Department “85 ” during the main water science and technology research topics. Nanyang City, Irrigation Bureau Irrigation Experimental Station in 1990 began to undertake such projects as research