Distribution Characteristics of Soil Organic Nitrogen in Rhizosphere of Different Sugarbeet Genotypes

doi:10.11924/j.issn.1000-6850.casb18090058

Abstract

Abstract: Apart from inorganic nitrogen in soil, organic nitrogen is also an important nutrient source for plant growth and development. In order to ascertain the absorption and utilization of organic nitrogen in the rhizosphere and the spatial distribution of organic nitrogen components in the rhizosphere of different genotype sugar beet, one each of varieties with high and low organic nitrogen efficiency was selected. Using Kuchenbuch-Zhou''s miniature and field net bags, the variation regularities of organic nitrogen components in the rhizosphere of sugar beet seedlings and the whole growth period of the field were studied, and the mathematical model of soil nitrogen mineralization and the spatial distribution of each component in the rhizosphere was established. The results showed that the content of organic nitrogen in the rhizosphere soil of 2 weeks old seedlings was as follows: acid hydrolysis total nitrogen (ATN) > amino acid nitrogen (AAN) > ammonia nitrogen (AN) > amino sugar nitrogen (ASN). Among them, AAN and AN form obvious depletion surface in the rhizosphere, that is, the farther away from the root surface, the higher the content. The highest value is reached at 15mm from the root surface, and the subsequent changes become more stable. The distribution law can be obtained by the equation Y =Y0+Aln(X) fitting. The content of ASN is low, and it is not significant with the distance between the rhizosphere. The different sugarbeet varieties have different depletion ability to rhizosphere organic nitrogen, and the varieties with high organic nitrogen absorption efficiency are all Higher than the low variety. Under natural conditions in the field, the contents of ATN, AAN and AN in the rhizosphere soil of the beet grew fastest at the seedling stage, then slowly increased and gradually became constant. The results of laboratory and field experiments showed that the mineralization of soil organic nitrogen was lower than that of non-nitrogen treatment after nitrogen application, and the mineralization of rhizosphere soil organic nitrogen was higher than that of low variety.

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