AGRB-2050 Study Guide - Midterm Guide: Growing Season, Poaceae, Ferrari 250
22 Sep 2016
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Critical for plant growth because each plant or crop type requires a minimum growing temperature. In temperate latitudes this is 6 degrees c. below this, members of grass family, including cereals, cannot grow. Growing season : the number of days between the last frost of spring and first frost of autumn. Growing season varies by crop; cotton needs 200, spring wheat needs 90. Mean annual rainfall for area determines whether farming is likely to be based upon tree crops, grass, cereals or irrigation. Few crops can grow when there is less than 250mm a year. Seasonal distribution is more significant than annual total. Long steady periods of rain allow water to soak into soil. Short heavy downpours lead to surface runoff and soil erosion. Growth is controlled by decrease in temperature at height. In britain few grasses can produce commercial yields above. In warmer latitudes wheat can ripen at 3000 m.
