Crops
The projects within the Green Revolution spread technologies that had already existed, but had not been widely used outside of industrialized nations. These technologies included pesticides, irrigation projects, and synthetic nitrogen fertilizer.
The novel technological development of the Green Revolution was the production of what some referred to as “miracle seeds.” Scientists created strains of maize, wheat, and rice that are generally referred to as HYVs or “high-yielding varieties.” HYVs have an increased nitrogen-absorbing potential compared to other varieties. Since cereals that absorbed extra nitrogen would typically lodge, or fall over before harvest, semi-dwarfing genes were bred into their genomes. Norin 10 wheat, a variety developed by Orville Vogel from Japanese dwarf wheat varieties, was instrumental in developing Green Revolution wheat cultivars. IR8, the first widely implemented HYV rice to be developed by the International Rice Research Institute, was created through a cross between an Indonesian variety named “Peta” and a Chinese variety named “Dee Geo Woo Gen.”
With the availability of molecular genetics in Arabidopsis and rice the mutant genes responsible (reduced height(rht), gibberellin insensitive (gai1) and slender rice (slr1)) have been cloned and identified as cellular signalling components of gibberellic acid, a phytohormone involved in regulating stem growth via its effect on cell division. Stem growth in the mutant background is significantly reduced leading to the dwarf phenotype. Photosynthetic investment in the stem is reduced dramatically as the shorter plants are inherently more stable mechanically. Assimilates become redirected to grain production, amplifying in particular the effect of chemical fertilisers on commercial yield.
HYVs significantly outperform traditional varieties in the presence of adequate irrigation, pesticides, and fertilizers. In the absence of these inputs, traditional varieties may outperform HYVs. One criticism of HYVs is that they were developed as F1 hybrids, meaning they need to be purchased by a farmer every season rather than saved from previous seasons, thus increasing a farmer’s cost of production.
Read more about this topic: Industrial Agriculture
Famous quotes containing the word crops:
“Paper is cheap, and authors need not now erase one book before they write another. Instead of cultivating the earth for wheat and potatoes, they cultivate literature, and fill a place in the Republic of Letters. Or they would fain write for fame merely, as others actually raise crops of grain to be distilled into brandy.”
—Henry David Thoreau (1817–1862)
“Religious fervor makes the devil a very real personage, and anything awe-inspiring or not easily understood is usually connected with him. Perhaps this explains why, not only in the Ozarks but all over the State, his name crops up so frequently.”
—Administration in the State of Miss, U.S. public relief program (1935-1943)
“Listen, that’s the one that done it. The dusters. They started it anyways. Blowin’ like this year after year. Blowin’ the land away. Blowin’ the crops away. Blowin’ us away now.”
—Nunnally Johnson (1897–1977)