PLNT 1213 Lecture Notes - Lecture 22: Glyphosate, Soybean, Soil Test
Document Summary
Soybeans originated and were first grown in northeastern china: first record 2838 bc. Soybeans first appeared in europe in the 17th century and in the united states in 1804. 4th largest crop in the world: 194 million acres in 2003, 6. 5 billion bushels (34 bushels per acre average) The united states is the world leader in soybeans: over 1/3 of global supply. Other major soybean-producing countries are brazil, argentina, china, and india. Climatic requirements similar to corn: average midsummer temperature of 75 to 77 degrees f is ideal. Combinations of high temperature and low precipitation are unfavorable: seed produced under high-temperature conditions tend to be low in oil and oil quality, soybean will withstand short periods or drought after the plants are well established. Soybean is sensitive to over irrigation: poor soil drainage can reduce yields. Groups were originally established by the photoperiod response (there is more flexibility now) Group iii and iv (indeterminate: april 1 to may 1.
