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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. Laboratory investigation of the effects of straw and simulated root exudates on aggregate -associated carbon | |||
Ma Hongliang,Zhu jianguo,Xie zubin,Gao ren | |||
Agronomy 31 October 2012 | |||
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Abstract:Although the enhancement in NPP (Net Primary Productivity) and increases in the soil C content by CO2 enrichment also found, little in known about how increased residue inputs to soils affect the storage of the soil organic C (SOC) in agricultural ecosystems and whether the additional root carbon input may affect the formation of soil aggregates and the information regarding their contribution to aggregate dynamics is insufficient. A simulated experiment was conducted to determine the effects of straw (rice and wheat) and root exudates (glucose, phenol, and organic acids) on the both dynamics and carbon content of soil aggregates with respect to the effects of elevated CO2. The results showed that the soil carbon for macro- (>250 μm) and micro-aggregates (250-53 μm) increased by 8.8%-73.1% due to the addition of straw and by 11.2%-111.7% (P<0.05) due to the exudates. Conversely, the soil carbon in the clay and silt-sized particles (<53 μm) was decreased by 12.3%-22.1% (P<0.05) by glucose and decreased even further with the addition of straw, whereas it was increased only by 5.8%-11.8% with phenol and organic acid. Further more, we found that the distribution of aggregates >53 μm was increased by the addition of straw and significantly increased by glucose and organic acid. The carbon concentration was significantly decreased by the addition of straw for the >250 μm and by glucose for >53 μm; conversely, the carbon concentration was increased by phenol and organic acid for both >250 μm and <53 μm. These results could help to explore the effects of elevated CO2 on the dynamics of both soil aggregates and carbon that may occur in a field due to variations in the crop straw and root exudate levels. | |||
TO cite this article:Ma Hongliang,Zhu jianguo,Xie zubin, et al. Laboratory investigation of the effects of straw and simulated root exudates on aggregate -associated carbon[J]. |
3. Variation of weed community composition in late rice crops due to long-term fertilization | |||
Yin Lichu,Zhang Yangzhu | |||
Agronomy 04 March 2010 | |||
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Abstract:The effect of various fertilization treatments on weed species composition in late rice crops was investigated in experimental plots established 26 years previously in Wangcheng county, Hunan province, China. The treatments examined influenced weed flora composition and density. Multivariate analyses showed that changes in the weed community composition were primarily due to light intensity on the field surface, followed by soil available N and P. More weed species and total weed density were observed in the control and PK plots, but less weed species and total density were found in the plots in which N, P, and K were applied together. Omission of N-application had more important influence on the weed community compared with the omission of P-, or K-application. Nutrient source from synthetic fertilizers and organic manure or additional lime application had no obvious effect on the weed community in late rice crops. | |||
TO cite this article:Yin Lichu,Zhang Yangzhu. Variation of weed community composition in late rice crops due to long-term fertilization[OL].[ 4 March 2010] http://en.paper.edu.cn/en_releasepaper/content/40392 |
4. Changes in weed community composition of early rice crops due to long-term fertilization | |||
Yin Lichu,Zhang Yangzhu | |||
Agronomy 03 March 2010 | |||
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Abstract:The effect of various fertilization treatments on weed species composition of early rice crops were investigated in experimental plots established 26 years previously in Wangcheng county, Hunan province, China. The treatments examined influenced weed flora composition and density. Multivariate analyses showed that changes in the weed community composition were primarily due to light intensity on the field surface, followed by soil available P and N. More weed species and total weed density were observed in the control and NK plots, but less weed species and total density were found in the plots in which N, P, and K were applied together. Omission of P-application had more important influence on the weed community compared with the omission of N-, or K-application. Nutrient source from synthetic fertilizers and organic manure or lime application had no obvious effect on the weed community. | |||
TO cite this article:Yin Lichu,Zhang Yangzhu. Changes in weed community composition of early rice crops due to long-term fertilization[OL].[ 3 March 2010] http://en.paper.edu.cn/en_releasepaper/content/40375 |
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