Irrigation

Description

Advanced Agronomy (Irrigation) Mind Map on Irrigation, created by labradorlass on 30/05/2013.
labradorlass
Mind Map by labradorlass, updated more than 1 year ago
labradorlass
Created by labradorlass over 11 years ago
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Resource summary

Irrigation
  1. improve crop quality
    1. aid harvesting in dry soils
      1. reduce capping
        1. aid germination
          1. maintain/increase yields
            1. crop requirement varies
              1. climate
                1. crop
                  1. potatoes
                    1. june/july
                      1. transpire 25-35mm/ha/week
                        1. equivalent to 250,000- 350,000litres/ha/week
                      2. apply 5mm at SMD=10mm to avoid common scab
                        1. BPC, 1999
                        2. 400mm per season
                          1. upto 200mm from irrigation (Shrops)
                      3. cultivar
                        1. length of growing season
                          1. soil type
                            1. soil structure
                              1. daily weather
                              2. soil water reserves deplete
                                1. gravitational
                                  1. evapotranspiration
                                    1. evaporation
                                      1. transpiration
                                    2. increase nutrient availability
                                      1. low soil moisture
                                        1. stomata close
                                          1. transpiration falls
                                            1. CO2 uptake reduced
                                              1. DM reduces
                                                1. wilt and die
                                                2. water uptake factors
                                                  1. air temp
                                                    1. relative humidity
                                                      1. high reduces transpiration
                                                        1. low increases
                                                      2. wind speed
                                                        1. low=low
                                                          1. high=high
                                                        2. solar radiation
                                                          1. size/ development/ age
                                                            1. soil
                                                              1. water status
                                                                1. structure
                                                              2. MAFF, 1988
                                                                1. approx. 17% AWC for all topsoils and subsoils
                                                                  1. silt loam = 23% & 22%
                                                                    1. sands = 12% & 7%
                                                                      1. peats = 35% & 35%
                                                                    2. Withers and Vipond 1974
                                                                      1. infiltration rate decreases over time
                                                                        1. reaches terminal rate
                                                                          1. 55mm/hr sand 30mm/hr loam 5mm/hr clay
                                                                      2. OM increases pore volume and size
                                                                        1. thus increasing infiltration and water capacity
                                                                        2. ADAS Irrigation best practice guide 2003
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