Irrigation

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Mind Map by , created over 6 years ago

Advanced Agronomy (Irrigation) Mind Map on Irrigation, created by labradorlass on 05/30/2013.

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Created by labradorlass over 6 years ago
Seed Rate
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AS Unit 1 Physics Flashcard Deck
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Primary Economic Activity: Irrigation
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Irrigation
1 improve crop quality
2 aid harvesting in dry soils
3 reduce capping
4 aid germination
5 maintain/increase yields
6 crop requirement varies
6.1 climate
6.2 crop
6.2.1 potatoes
6.2.1.1 june/july
6.2.1.1.1 transpire 25-35mm/ha/week
6.2.1.1.1.1 equivalent to 250,000- 350,000litres/ha/week
6.2.1.2 apply 5mm at SMD=10mm to avoid common scab
6.2.1.2.1 BPC, 1999
6.2.1.3 400mm per season
6.2.1.3.1 upto 200mm from irrigation (Shrops)
6.3 cultivar
6.4 length of growing season
6.5 soil type
6.6 soil structure
6.7 daily weather
7 soil water reserves deplete
7.1 gravitational
7.2 evapotranspiration
7.2.1 evaporation
7.2.2 transpiration
8 increase nutrient availability
9 low soil moisture
9.1 stomata close
9.2 transpiration falls
9.3 CO2 uptake reduced
9.4 DM reduces
9.5 wilt and die
10 water uptake factors
10.1 air temp
10.2 relative humidity
10.2.1 high reduces transpiration
10.2.1.1 low increases
10.3 wind speed
10.3.1 low=low
10.3.1.1 high=high
10.4 solar radiation
10.5 size/ development/ age
10.6 soil
10.6.1 water status
10.6.2 structure
11 MAFF, 1988
11.1 approx. 17% AWC for all topsoils and subsoils
11.1.1 silt loam = 23% & 22%
11.1.2 sands = 12% & 7%
11.1.3 peats = 35% & 35%
12 Withers and Vipond 1974
12.1 infiltration rate decreases over time
12.1.1 reaches terminal rate
12.1.1.1 55mm/hr sand 30mm/hr loam 5mm/hr clay
13 OM increases pore volume and size
13.1 thus increasing infiltration and water capacity
14 ADAS Irrigation best practice guide 2003

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