Xem 1-7 trên 7 kết quả Moisture distribution
  • A seeder should place seed in an environment for reliable germination. The main objective of sowing is to put seeds at a desired depth and spacing within the row. Uniform seed distribution within the soil result in better germination and emergence and increase yield by minimizing competition between plants for available light, water, and nutrients. A number of factors affect seed distribution in soil. Seed metering system, seed delivery tube, furrow opener design, physical attributes of seed and soil conditions all play a part in determining seed distribution....

    pdf272p nhatkyvodanh 05-09-2012 43 18   Download

  • “Be it deep or shallow, red or black, sand or clay, the soil is the link between the rock core of the earth and the living things on its surface. It is the foothold for the plants we grow. Therein lays the main reason for our interest in soils.” --- Roy W. Simonson, USDA Yearbook of Agriculture, 1957. The British naturalist Charles Darwin (1809–1882) was probably the first scientist to examine a soil profile and suggest factors responsible for the structure of the various layers.

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  • Written by an expert with over 20 years of experience in the field, this timely volume provides - in a single source - all aspects of humidity measurement and instrumentation, including rudiments and theory, common applications, advantages and limitations of frequently used sensors and techniques, and guidelines for installation, maintenance, and calibration.

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  • 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.

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  • Because agricultural production is seasonal, the products have to be stored for distribution later. The storage function involves risks -- risks of deterioration of products and risks of fluctuating market prices. Elaborate precautions are taken to guard against any deterioration of products from excessive moisture, heat, contaminating metals, bacteria and fungi, insects, and rodents and against loss from fire and theft.

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  • 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.

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  • A new class of rugged fiber optic connectors has been introduced to speed residential connection in Fiber-To-The-Premises (FTTP) cabling networks. The connectors are strategically located in the distribution network to facilitate service connection, maintenance and reconfiguration of subscriber services. Connectors are typically staged at the street outside a residence to facilitate easy access and connection to the residence at a later date.

    pdf8p halanh 13-08-2009 70 2   Download

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