Nitrate leaching

Xem 1-4 trên 4 kết quả Nitrate leaching
  • High distribution uniformity and low application rate, at frequent irrigation cycles, provide maximum control and monitoring of the wetted and aerated soil profile, which is essential for the shallow root system of the lettuce. Low application rate (3-5 mm/h): allows optimal absorption of water into the soil with no run-off, even on slopes. Low droplet impact: preserves soil structure and prevents crust formation to allow perfect germination and development.

    pdf12p docvachiase 03-05-2013 23 6   Download

  • Moisture deficiencies occurring early in the crop cycle may delay the maturity season and reduce yields. Shortages later in the season often lower quality, as well as yields. However, irrigation surplus, especially late in the season, can reduce both the quality and the post-harvest life of the crop. Uneven or surplus irrigation, above the amount required to replace evapotranspiration, causes nitrate leaching below the root system and the ability of the crop to recover from the nitrogen deficiency decreases.

    pdf8p docvachiase 03-05-2013 18 3   Download

  • Enormous increases in agricultural productivity can properly be associated with the use of chemicals. This statement applies equally to crop production through the use offertilizers, herbicides, and pesticides, as to livestock production and the associated use of drugs, steroids, and other growth accelerators. There is, however, a dark side to this picture and it is important to balance the benefits which flow from the use of agricultural chemicals against their environmental impacts, which sometimes are seriously disadvantageous.

    pdf134p tom_123 14-11-2012 19 2   Download

  • The presence of substances in groundwater may be affected by naturally occurring processes as well as by actions directly associated with human activities. Naturally occurring processes such as decomposition of organic material in soils or leaching of mineral deposits can result in increased concentrations of several substances. Those of health concern include arsenic, fluoride, selenium, uranium, nitrate, metals, and radionuclides such as radon. Problems of aesthetic quality and acceptance may be caused by iron, manganese, sulphate, chloride and organic matter. ...

    pdf50p cao_can 29-12-2012 20 5   Download

Đồng bộ tài khoản