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首页> 外文会议>STI/PUB/1285; Consultants Meeting on Management Practices for Improving Sustainable Crop Production in Tropical Acid Soils; 19990501-03; Vienna(AT) >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：利用I5N同位素技术估算委内瑞拉酸棕土中热带豆科植物的生物固氮潜力。

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摘要

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：委内瑞拉热带酸性稀树草原土壤中农业生产的主要限制因素是铝（Al）的毒性以及磷（P）和氮（N）的缺乏。可持续的和具有成本效益的氮补充战略，特别是对于小农而言，可以依靠生物N_2的潜在投入。固定豆科植物的固氮（BNF），从而有助于系统的整体氮经济，并减少了将氮肥用于谷物或草的需求。进行了初步实验，以估算〜（15）N同位素技术在委内瑞拉大草原的典型热带古豆中生长的各种热带豆类中的BNF潜力。在田间试验中，木豆（Cajanus cajan）的BNF较高（占总N的79％），在土壤-植物系统中的N平衡为正。因此，它是一种有前途的谷物豆科植物，可用于委内瑞拉热带酸性稀树草原土壤的轮作。在温室研究中，大豆和靛蓝的固氮估计分别为Ndfa的68-76％和Ndfa的62-71％，表明它们具有作为作物轮作系统中N的贡献者的潜力。建立准确的氮平衡并评估大豆和靛蓝对委内瑞拉大草原地区轮作或作为绿色肥料/覆盖作物的谷物作物的氮贡献。

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