User:Pusillanimous/Small grains

Cereal developmental stage scales are tools used by farmers, agronomists, and agricultural extension agents to describe the development and phenostages of cereal crops like wheat and maize. These scales or systems are useful in planning management strategies that incorporate plant growth information for the use of pesticides and fertilizers to avoid damaging the crop and/or maximize crop yield. There exist some computer systems to interconvert between different scales.

Iowa State University Scale
This scale has been developed extensively.

Variations

 * Leaf Collar
 * Droopy Leaf

Feekes
The Feekes scale is stage scale used by agronomists to to identify the growth and development of small cereal crops. The scale was originally described in 1941. The Feekes scale is more widely used in the United States and is considered less descriptive than Zadoks or BBCH. Values in the Feekes scale run from 1.0 at emergence to 14.1 when the plant's straw is dead.

Zadoks
The Zadoks scale (or the Zadoks-Chang-Konzak scale) for cereals was developed in 1974. It is usually used more often by agricultural researchers than a simpler scale for cereals like Feekes or Bruns and Croy.

Haun
The Haun scale was developed in 1973. This scale is more indicative of vegetative development than kernel development.

Other
The Bruns and Croy scale was developed in 1983. The scale is primarily designed for use in farming winter wheat within the Great Plains region of the United States. Values in the scale range from a rating of 1 at germination and emergence to a 10 at the plants physiological maturity when the wheat kernels have become hard. 1971 1979
 * Bruns and Croy
 * Jensen and Lund
 * Waldren and Flowerday