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首页> 美国政府科技报告 >Nuclear methods for plant nutrient and water balance studies. Results of an FAO/IAEA regional technical co-operation program on nuclear methods for plant nutrients and water balance studies under legume-cereal or fallow-cereal crop rotation systems implemented for Middle Eastern countries (1991-1994)
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Nuclear methods for plant nutrient and water balance studies. Results of an FAO/IAEA regional technical co-operation program on nuclear methods for plant nutrients and water balance studies under legume-cereal or fallow-cereal crop rotation systems implemented for Middle Eastern countries (1991-1994)

机译：植物营养和水平衡研究的核方法。粮农组织/国际原子能机构关于中东国家实施的豆类 - 谷物或休耕 - 谷物作物轮作制度下植物养分和水平衡研究核方法的区域技术合作计划的成果（1991-1994）

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In semi-arid Middle Eastern countries, the increasing demand for food and other agricultural products calls for urgent measures to increase plant nutrient availability and water use efficiency. Water and plant nutrients are the two main crop yield limiting factors in these regions. It has been recognized for years that the growth of leguminous crops can improve the N status of the soil through biological nitrogen fixation (BNF). The BNF process is especially interesting for those areas facing limited fertilizer N availability or where the price of the fertilizers is too high for the farmers. In view of sustainable productivity, even with adequate supply of nutrients (nitrogen) and water, crop rotations have been promoted for years. However, the best rotation, taking into account the available nutrients and water in a specific place, is not always known. Furthermore, if a leguminous crop can be incorporated into a crop rotation system, free N is provided for this crop and some of it can serve as residual N for the next crop in the rotation. The use of N-15 technology provides a unique tool to separately study the behavior of fertilizer N as well as soil N. In addition, the quantification of residual fertilizer N is possible, as well as the quantification of BNF. Refs, figs, tabs. (Atomindex citation 27:059309)

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