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Northeast Agricultural University (2009)

The Studies on Coupling Effects between Water and Nitrogen of Maize in West Semiarid Region of Heilongjiang Province

Zhong Shuang

Titre : The Studies on Coupling Effects between Water and Nitrogen of Maize in West Semiarid Region of Heilongjiang Province

Auteur : Zhong Shuang

Grade : Master’s Theses 2009

Université : Northeast Agricultural University

Résumé
Semiarid western Heilongjiang Province has great potential in agricultural production, food crop production in the province occupies an important position, but insufficient water resources limit agricultural production in the region. Unreasonably restricting the potential for fertilization to play one of the main water, under certain conditions, fertilization can greatly improve crop water use efficiency in dryland agriculture therefore the relationship between water and nutrients have been more and more people’s attention. In this paper, 2007 in Qiqihar City, Heilongjiang Province, Gannan pot experiment was conducted test base, focus on the northeastern semi-arid climatic conditions, with different water and nitrogen fertilizer on corn growth, grain yield, water consumption impact. Study of water and fertilizer coupling, the design wet growth period, fitness water, mild drought, moderate drought four kinds of water levels, respectively, and from low to high nitrogen levels in four of the 16 kinds of combination treatment. Analysis of the different water treatments, different nitrogen treatment and Fertilizer Coupling on maize growth, yield, water consumption impact. Were established yield and water consumption and water, nitrogen two factors mathematical regression model showed that water and nitrogen on maize yield significant positive coupling effect, a reasonable amount of nitrogen fertilizer to increase maize transpiration, reducing evaporation. Finally, draw moisture level of each corresponding ideal maximum yield of water production function. Study the role of water stress, the corn growth stages each (in this experiment, the corn growing period is divided into seedling, jointing, tasseling, filling four growth stages) set a moderate drought treatment, appropriate water remaining growth stages , respectively, with the same four from low to high nitrogen levels combined, a total of 16 kinds of treatment. These deal with the whole growth period appropriate control treatment water treatment comparison, analysis of different nitrogen levels under the conditions of water stress at different growth stages on maize growth and yield. The results showed that : corn at different growth stages by water stress, growth conditions and production will be affected to some degree, but with varying degrees affected. Using gray relational analysis to non-treated adequately evaluate irrigation experiment concluded that corn seedling and filling of water stress on the impact of irrigation efficiency, less than in the jointing stage and heading stage to water stress, the amount of the increase in the amount of nitrogen fertilizer corn irrigation efficiency can be improved. Study the relationship between yield and water consumption, analyzed all the 32 kinds of treatment. The relative scarcity of water resources, agriculture and irrigation water can not increase incomes in the context of food required to determine the semi-arid western Heilongjiang Province irrigation system, we must first consider the cost of irrigation and yield relationship, and then decide the timing and distribution of irrigation water quantity, so that the highest efficiency of irrigation. First, the whole growth period of maize yield and water consumption, and setting up a maize under different nitrogen yield and growth period water consumption regression equation, through the analysis to determine the optimal range of moisture into the upper and lower limits ; then calculated the different nitrogen conditions, corn net unilateral largest economy irrigation water quota and the highest economic water use efficiency irrigation quota ; final stage of corn yield and water consumption relationship, using Jensen model maize under different nitrogen conditions at each growth stage of the moisture sensitivity index , according to the moisture sensitivity index solved using LINGO non-linear programming model for a limited amount of water in the corn at different stages throughout the growing period to optimize the allocation and actual irrigated compared to obtain the same yield, by the model optimized irrigation water to be less than the actual amount of irrigation water, to achieve the purpose of saving high yield.

Mots clés : Corn Fertilizer coupling Water Stress Grey Correlation Analysis Moisture Sensitive Index

Présentation (Dissertation Topics) ]

Page publiée le 25 octobre 2014, mise à jour le 11 mars 2018