Influence of Different Agronomic Measures on Nitrogen Use Efficiency of Water- saving Spring Wheat in Hetao Irrigation District

Abstract

[Objective] The aim was to study the wheat growth and development characteristics and its plants nitrogen use absorption law systematically to clarify the relationship between different agronomic measures and nitrogen use,reveal the physiological mechanism of high efficiency use of nitrogen under water- saving conditions deeply to confirm on the suitable agronomic measures of water- saving spring wheat to realize high efficiency use of nitrogen,then to get the goal of decreasing nitrogen application amount,improving nitrogen use efficiency,cutting down wheat production cost,reducing environment pollution to protect ecological environment. [Method] On the basis of water- saving irrigation pattern of preliminary studies established,the field experiment was carried out through the four factors and five levels quadratic regression orthogonal designed test,a quadratic polynomial regression mathematical model of major agronomic measures and nitrogen use efficiency of spring wheat in Hetao Irrigation Region of the Inner Mongolia were established taking the four key agronomic measures( basic seedlings number,the amount of basic phosphorus,nitrogen application amount and irrigation water quota) as decision variables,and the nitrogen use efficiency as the objective function. [Result]The effects of the four agronomic measures on nitrogen use efficiency was in the order of basic seedlings number irrigation water quota nitrogen application amount the amount of basic phosphorus. Through the frequency analysis, quantitatively proposed that optimized agronomic measures combination plan of spring wheat of the Hetao Irrigation District realizing high nitrogen use efficiency was as follows: the basic seedlings number was 6. 789- 7. 109 million plants per hectare,the amount of basic phosphorus( P2O5) was 142. 4- 158. 9 kg/hm2,additional nitrogen amount of jointing stage( pure N) was 124.5- 142.0 kg/hm2,the irrigation quota of jointing and heading stage was 903. 75- 951. 6 m3/ hm2,which achieved that the nitrogen use efficiency of water-saving spring wheat was more than 10 kg / kg. [Conclusion] The study provides a theoretical basis for establishing water- saving,fertilizer-saving and high yield production technological system of spring wheat in Hetao Irrigation Region of the Inner Mongolia.

Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗

The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.