Search

【Objective】The agro-pastoral ecotone at Inner Mongolia and Liaoning border is an important part of the farming-pastoral ecotone in northern China, and it is also the ecological barrier of the commodity grain base and heavy industry production base in Liaoning. 【Method】Maize was the main crop in this area and play an important role in grain production. In this paper, the maize in the agro-pastoral ecotone at Inner Mongolia and Liaoning border was used as the research object, and the differences of C and N contents in various organs of maize under the two methods of irrigating and mulching were analyzed. 【Result】Under the two planting methods, the C content of the stem was the highest and the C content of the root was the lowest; The N content of leaves and ears was higher, the N content of roots was lower; the C/N of roots and stems was higher, and the C/N of leaves was lower. Compared the two planting methods: The C content of leaf in the irrigated land was significantly higher than that in the mulched land; the N content of the stem was significantly lower than that in the mulched land; The C/N of stem and leaf was significantly higher than that in the mulched land; The soil organic matter was significantly lower than that in the mulched land. 【Conclusion】Comparing with irrigated land, the mulching method can more effectively maintain soil nutrients, reduce water waste and also improve maize quality and yield. [ABSTRACT FROM AUTHOR]