Agricultural nitrate pollution

Xem 1-6 trên 6 kết quả Agricultural nitrate pollution
  • Tham khảo sách 'a-z of the environment : covering the scientific, economic and legal issues facing all types of organisation', khoa học tự nhiên, công nghệ môi trường phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả

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  • Nitrogen use efficiency (NUE) is very important for reducing the cost of production, sustainable agriculture and mitigates the environment pollution. It is more so in case of major cereals like wheat, where the NUE is approximately 40%. NUE comprises of Nuptake by the root and then their assimilation, utilization, remobilization by the shoot. However, utilization primarily dependent on available resources, i.e. amount of N-uptaken by the root system.

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  • Nonpoint nguồn ô nhiễm nước ngầm và nước bề mặt từ nông nghiệp tưới tiêu là một mối quan tâm lớn trong nhiều lĩnh vực của miền Tây Hoa Kỳ và các nơi khác. Thuốc trừ sâu gây ra suy giảm chất lượng nước ở các sông, suối ở California, và nitrate gây ra nước ngầm pollution.1 Nitrate và ô nhiễm thuốc bảo vệ thực vật của nước ngầm là mối đe dọa nghiêm trọng trong báo cáo mới Mexico.2 Nebraska chất gây ô nhiễm như amoniac, chất dinh dưỡng thuốc trừ sâu, lắng bùn ở, làm giàu hữu cơ, và tổng hòa tan chất rắn...

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  • Drainage of water through the soil profile to groundwater and surface water appears to be the hydrologic pathway that most frequently leads to problematic nitrate contamination of surface waters in agricultural watersheds. This can occur in two ways: by natural drainage where ground water contributes to stream flow and river flow, and by artificial subsurface drainage, where perforated pipes (sometimes called tile drains) have been buried in the soil for the purpose of removing water to reduce damage caused by saturated conditions and thereby enhance crop production (Fig. 1).

    pdf27p tainhacmienphi 19-02-2013 54 4   Download

  • If the soil becomes saturated, oxygen may become scarce and in anoxic conditions, denitrifying bacteria may convert the nitrate to nitrogen gases (NO, N2O, and N2). Nitrogen converted to these gases becomes unavailable for plant uptake or for surface water contamination. Additionally, saturated soil during the growing season is harmful to many crops like maize that cannot tolerate low oxygen concentrations in the root zone for more than a few days.

    pdf0p tainhacmienphi 19-02-2013 38 2   Download

  • N fertilizers and high yielding varieties were major drivers of the enormous increase in rice productivity during the past 50 years. Despite increasing food production higher nitrogen use also contributed in environmental pollution and Increasing consciousness of conservation of environment and mitigation of climate change brought a major shift in cultivation practices of major crops towards organic agriculture. An important issue regarding the acceptance of organic agriculture is the question of productivity.

    pdf19p nguaconbaynhay5 16-05-2020 5 0   Download



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