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首页> 外文会议>Consultants Meeting on Management Practices for Improving Sustainable Crop Production in Tropical Acid Soils >ESTIMATING BIOLOGICAL NITROGEN FIXATION POTENTIAL OF TROPICAL LEGUMES GROWN IN ACID SAVANNAH SOILS OF VENEZUELA USING I5N- ISOTOPIC TECHNIQUES
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ESTIMATING BIOLOGICAL NITROGEN FIXATION POTENTIAL OF TROPICAL LEGUMES GROWN IN ACID SAVANNAH SOILS OF VENEZUELA USING I5N- ISOTOPIC TECHNIQUES

机译：使用I5N-同位素技术估算委内瑞拉酸大草原土壤中生育热带豆类的生物氮固定潜力

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The main limiting factors of agricultural production in the tropical acid savannah soils of Venezuela are the toxicity of aluminium (Al) and the deficiencies of phosphorus (P) and nitrogen (N). Sustainable and cost-effective N-replenishment strategies, in particular for smallholders can rely on the potential inputs from the biological N_2. fixation (BNF) in legumes, thus contributing to the overall N economy of system and reducing the needs for N-fertilizer to be applied to cereals or grasses. Preliminary experiments were carried out to estimate the BNF potential in various tropical legumes grown in a Typic Paleustult of the savannah of Venezuela using ~(15)N-isotopic techniques. In the field experiment pigeon pea (Cajanus cajan) showed high BNF (79% of its total N) with a positive N balance in the soil-plant system. Thus it is a promising grain legume for inclusion in cop rotation systems in the tropical acid savannah soils of Venezuela. In a greenhouse study, the nitrogen fixation estimates in soybean and indigosphera were 68-76% and 62-71% Ndfa respectively indicating their potential for inclusion as N contributors to crop rotation systems.. Field experiments should be carried out to confirm this potential, to establish an accurate N balance and assess the N contribution of soybean and indigosphera to the cereal crop grown in rotation or as green manure/cover crop in the savannah areas of Venezuela.
机译：委内瑞拉热带酸大草原土壤的主要限制因素是铝（Al）的毒性和磷（P）和氮气的缺陷（n）。可持续和经济高效的N补充策略，特别是小农可以依赖于生物N_2的潜在投入。豆类中的固定（BNF），从而有助于系统的整体N经济性，并降低谷物或草地的需求。进行了初步实验，以估算在委内瑞拉大草原的典型歌渣中生长的各种热带豆类中的BNF潜力使用〜（15）N-同位素技术。在野外实验中，鸽子豌豆（Cajanus cajan）在土壤 - 植物系统中显示出高BNF（总共N总量的N）（其总N的79％）。因此，它是一种有前途的谷物豆类，用于纳入委内瑞拉的热带酸草原土壤中的Cop旋转系统。在温室研究中，大豆和靛蓝的氮固定估计分别为68-76％和62-71％的NDFA，分别表明它们作为作物旋转系统的N个贡献者的纳入潜力。现场实验应进行以确认这种潜力，建立准确的N平衡并评估大豆和靛蓝的N贡献，以旋转的谷物种植或作为委内瑞拉的大草原地区的绿色粪便/覆盖作物。

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