Effects of different tillage layer structures on growth and yield of maize in cropland zone in northeast of China
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Key Words: cropland  tillage layer structure  maize  yield
郑洪兵 沈阳农业大学农学院, 辽宁 沈阳 110866
吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130033 
郑金玉 吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130033 
罗洋 吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130034 
李瑞平 吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130035 
王浩 吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130036 
李伟堂 吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130037 
刘武仁 吉林省农业科学院农业资源与环境研究所/农业部东北作物生理生态与耕作重点实验室, 吉林 长春 130038 
齐华 沈阳农业大学农学院, 辽宁 沈阳 110866 
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      A long-term positioned experiment had been conducted since 1983 in Gongzhuling empolying plow tillage (PT), no-tillage (NT), spacing tillage (NT) and conventional tillage (CT). The seeding rate, plant height, stem diameter, leaf number, root and yield of maize were measured in the study in odrder to investigate the effects of different tillage layer structures on growth and yield of maize. The results showed that the seeding rate was higher in spacing tillage (94.90%), than that in other treatments. The height and stem diameter of seeding stage were increased in ST. Moreover, compared to those in PT and CT, leaf numbers in ST were significantly increased by 0.8 and 1.2, which was not significantly different from that in NT. After flowering stage, the growth of maize was enhanced, leaf area of plants was increased and mass of roots was improved. In particular, compared with CT, root numbers were increased by 16.80, layers of aerial root were increased by 0.80, gaining 4.60 and 20.50 g weight in stalk root and aerial root, respectively. Meanwhile, the yield of maize with ST treatment was higher than that with other treatments, ranging from 8.17% to 15.02% and the yield of maize was lowest in CT. Therefore, ST was the optimal layer because it could enhance the growth of seeding and delay the process of decrepitude of maize in black soil zone in Jilin province.