نتایج جستجو برای: cropping systems

تعداد نتایج: 1189470  

2012
Ling Liu Qian Zhang Liangliang Hu Jianjun Tang Ligen Xu Xiantian Yang Jean W. H. Yong Xin Chen

Legumes are widely used in many cropping systems because they share their nitrogen fixation products and phosphorus mobilization activities with their neighbors. In the current study, however, we showed that co-cultivation with legumes increased cadmium (Cd) contamination in the adjacent crops. Both field and mesocosm experiments indicated that legumes increased Cd levels in edible parts and sh...

2017
Gary E. Varvel Mark A. Liebig John W. Doran

Assessing effects of cropping systems on soil organic matter (SOM) and soil carbon (C) changes are necessary to make accurate projections regarding sequestration and emission of CO2 by agricultural soils. This process requires substantial annual management inputs and large outlays for soil sampling and analyses. Our objectives were (1) to evaluate and test an alternative method for soil organic...

Journal: :Agronomy for Sustainable Development 2009

Journal: :Journal of the Northeastern Agricultural Economics Council 1979

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