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Northwest University of Science and Technology (2008)

Effect of Different Cultivation Patterns and Zinc Fertilization on the Drought Resistance of Summer Maize in Arid and Semiarid Region

李萌;Li Meng

Titre : Effect of Different Cultivation Patterns and Zinc Fertilization on the Drought Resistance of Summer Maize in Arid and Semiarid Region

Auteur : 李萌;Li Meng

Grade : Master’s Theses 2008

Université : Northwest University of Science and Technology

Résumé
Water is a kind of most ordinary material in surface of the earth, while it is the most important material, which has very important effect on our life. The soil moisture is one of the essential condition of growth of plant, not only determine the distribution of plants on surface of the earth, but also influence the crops yield and timber’s growth. But drought already becomes an important issue which influences the food security in our country. In the northwest of China, the drought has limited the development of local agricultural production seriously. So, in the arid agriculture areas of northwest, how to utilize the limited water resource effectively, improve the moisture utilization of crops efficiency and probe into various effective ways and measures, is becoming the key of improving the drought farmland productivity level. Therefore, a series of researches have been carried out. We have studied the influence of development trends, morphological characteristic, physiological index and yield in different parenting stage of maize under drought condition. In order to offer the basis which adapt and retard the countermeasure of harmful aridity effects, we have studied the influence of zinc absorption of plant under adverse circumstance and influence of moisture utilize of plant when zinc nutritional status. On purpose of explore the way of improving environmental quality and measure of water-saving agricultural suitable for the local climate. The rainfall harvesting planting system has been studied under different cultivation pattern condition. The main results obtained were as follow :(1) Three treatments with different water supply to maize plants before and after blooming was conducted in this experiment, namely, one was adequate water supply condition at the whole growth period ; the second was water stress condition before blooming ; the third was water stress after blooming. The bleeding intensity, some root growth parameters, root vigor, activity of protective enzymes and malondialdehyde (MDA) were determined at jointing stage, trumpet stage, flowering stage and mature stage. The results obtained were as follows : the anthesis of maize is the key period for senescence starts for root and leaf. For the maize plants under adequate water supply condition, the bleeding intensity, root vigor, catalase (CAT) activity and peroxidase (POD) activity increased gradually from the trumpet stage to following stage, they reached the maximum at atheists, and then they fell. For the maize plants which were grown under water stress before blooming, the root growth was inhibited, bleeding intensity was decreased, and root vigor was lowered. When maize plants were grown under water stress condition after blooming, the anti-oxidizes defense system of former plants was weaken because activity of three protective enzymes dropped greatly. Even adequate water was supplied after blooming ; the negative influence of water stress on maize growth before blooming is hard to be eliminated.(2) A pot experiment was conducted in order to research the influence of drought resistant physiological response at the whole growth period of maize after zinc application under adequate water supply condition, mild water stress condition and severe water stress condition. The result indicated that, zinc not only had nutritional functions, but also had the capability to enhance the drought resistance of maize under water stress condition. This kind of drought resistance function of zinc was more obvious under water stress condition. In the key period of blooming, the drought resistance function of zinc from high to low successively was as follows : severe water stress condition>mild water stress condition>adequate water supply condition. However, the way of zinc fertilizer application to strengthen the drought resistance of plant was limited ; it is difficult to resume normal growth of crop under severe water stress condition. Therefore, the drought resistance function has regional adaptability and zinc can play a certain role of drought resistance function in arid and semiarid region.(3) The method of chelator-buffering nutrient solution was adopted in this experiment, zinc supply under the three experimental conditions : severe zinc deficiency, mild zinc deficiency, normal zinc supply. Research on influence of drought resistant physiological response at the seedling stage of maize after zinc application under the three equal osmotic potential conditions : drought stress, salt stress, bicarbonate (HCO3-) stress

Mots clés : Water; Maize; Cultivation pattern; Adverse circumstances; Zinc fertilizer;

Présentation (CNKI)

Page publiée le 28 avril 2013, mise à jour le 22 novembre 2017