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1. Effect of maize-soybean intercropping and nitrogen rates on crop nitrogen and carbon uptake in upland red soil | |||
YANG Wenting,MIAO Jianqun,WANG Xiaowei,XU Jiancheng,LU Meijuan | |||
Agronomy 04 May 2017 | |||
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Abstract:The objective of this research was to determine the effect of cropping patterns (mono maize, mono soybean and maize-soybean intercropping) and nitrogen rates (0, 75, 150, 225, 300 kg/ha) on crop biomass, nitrogen and carbon accumulation in upland red soil. The results show that: Compared with sole maize, maize dry matter yield and carbon accumulation decreased when in intercropped soybean. Also, the interaction between intercropping and nitrogen rates changed nitrogen accumulation and distribution in crop grain, straw and root. Nitrogen application significantly increased maize dry matter yield, nitrogen and carbon accumulation, but reduced those of soybean. In a conclusion, corn-soybean intercropping and nitrogen rates affected the growth of corn and soybean in upland red soil, and changed the allocations of nitrogen and carbon. Maize-soybean intercropping should be an effective and sustainable cropping system for upland red soil. | |||
TO cite this article:YANG Wenting,MIAO Jianqun,WANG Xiaowei, et al. Effect of maize-soybean intercropping and nitrogen rates on crop nitrogen and carbon uptake in upland red soil[OL].[ 4 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732613 |
2. Elevation of arginine decarboxylase-dependent putrescine production enhances aluminum tolerance by decreasing aluminum retention in root cell walls of wheat | |||
Yu Yan,Jin Chongwei,Sun Chengliang,Wang Jinghong,Ye Yiquan,Lu Lingli,Lin Xianyong | |||
Agronomy 09 July 2015 | |||
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Abstract:Aluminum (Al) stress induces putrescine (Put) accumulation in several plants and this response is proposed to alleviate Al toxicity. However, the mechanisms underlying this alleviation remain largely unknown. Here, we show that exposure to Al clearly increases Put accumulation in the roots of wheat plants (Triticum aestivum L. 'Xi Aimai-1') and that this was accompanied by significant increase in the activity of arginine decarboxylase (ADC), a Put producing enzyme. Application of an ADC inhibitor (D-arginine) terminated the Al-induced Put accumulation, indicating that increased ADC activity may be responsible for the increase in Put accumulation in response to Al. The D-arginine treatment also increased the Al-induced accumulation of cell wall polysaccharides and the degree of pectin demethylation in wheat roots. Thus, it elevated Al retention in cell walls and exacerbated Al accumulation in roots, both of which aggravate Al toxicity in wheat plants. The opposite effects were true for exogenous Put application. These results suggest that ADC-dependent Put accumulation plays important roles in providing protection against Al toxicity in wheat plants through decreasing cell wall polysaccharides and increasing the degree of pectin methylation, thus decreasing Al retention in the cell walls. | |||
TO cite this article:Yu Yan,Jin Chongwei,Sun Chengliang, et al. Elevation of arginine decarboxylase-dependent putrescine production enhances aluminum tolerance by decreasing aluminum retention in root cell walls of wheat[J]. |
3. Amelioration of nitrogen difference method in legume intercropping system | |||
Yu Changbing,Li Long | |||
Agronomy 28 December 2007 | |||
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Abstract:Nitrogen difference method is commonly used to appraise biological nitrogen fixation, which is a well established aspect of plant condition. In an intercropping system, belowground interspecific interactions affected the reliability of this method, so a field experiment was conducted to ameliorate this problem. A split-plot experiment was designed, with the main plot treatments of 0 and 225 kg N ha-1, and sub-plot treatments consisting of sole maize, sole faba bean, sole pea and sole soybean, and faba bean, pea and soybean intercropping with maize. Biomass of intercropping faba bean and pea was found to be increased, but soybean decreased significantly. Biomass of intercropping maize increased significantly than grown alone. Adding fertilizer nitrogen had no marked effect on biomass of the legumes, but that of maize increased. Aggressivity of faba bean (1.06~1.56) and pea (0.11~0.76) were always significantly greater than zero, but it was significantly decreased for soybean (-1.17~-0.81) than maize. Proportion of biological nitrogen fixation %Ndfa) increased for intercropping faba bean and pea than sole, and it was decreased for soybean due to a difference between legume and reference plant. Add nitrogen could decrease %Ndfa significantly for all legumes. An ameliorated nitrogen difference method was established, which takes into account the difference of nitrogen loss and interspecific nutrient competition. Compared with traditional methods, the %Ndfa of intercropping faba bean decreased significantly, and %Ndfa of intercropping pea decreased also, but %Ndfa of soybean increased. Since consider the nitrogen loss and interspecific nitrogen competition and transfer, the ameliorated method of NDM could appraise the proper %Ndfa of intercropping legumes more accurately. | |||
TO cite this article:Yu Changbing,Li Long. Amelioration of nitrogen difference method in legume intercropping system[OL].[28 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17515 |
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