Center-pivot irrigation

**History of Center-Pivot Irrigation:**
– Invented in 1940 by Frank Zybach in Strasburg, Colorado.
– Zybach partnered with A. E. Trowbridge in 1952.
– Zybach licensed his patent to Robert Daugherty in 1954.
– Daugherty’s company evolved into Valmont Industries.
– Early designs faced challenges but were continuously improved.

**Overview of Center-Pivot Irrigation:**
– Consists of pipe segments with sprinklers fed from the pivot point at the center.
– Suitable for flat terrains and undulating regions.
– Commonly used in the United States, Australia, Brazil, and desert areas.
– Nozzles vary in size and application rate across the machine radius.

**Types of Irrigation Machines:**
– Center-Pivot Irrigation: Efficiently irrigates crops planted in circles.
– Linear or Lateral Move Irrigation Machines: Lateral-move irrigation moves in a straight line, common in Australia for rectangular fields, requires complex guidance systems.

**Benefits and Negative Effects of Center-Pivot Irrigation:**
– Benefits: Requires less labor, reduces soil erosion and water runoff, encourages organic material decomposition, transformed semiarid regions into agriculturally productive areas.
– Negative Effects: Over-extraction of groundwater, Jevons paradox observed, depletion of Ogallala Aquifer, negative impact on groundwater levels and aquifer sustainability.

**Role in Culture and Further Reading:**
– Recognition of High Plains Aquifer increased in the 21st century.
– Shift towards modernism in farming practices noted in mid-1970s and 1980s.
– Generation opted for high-risk, high-reward crops requiring large resources.
– Additional sources and references for further exploration.