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Tuesday, May 21, 2002

Evaluating Corn Stands

D.R. Hicks, Extension Agronomist

I recently wrote a news release that suggested thinking about replanting might be premature because the reports I had indicated the germinating seeds had roots and shoots that were firm, but growing very slowly. While not a heat wave, the temperatures have been warmer and corn is emerging. However, some corn seeds are rotting and I think growers need to look carefully now at the situation so they can replant if necessary.

Tuesday, May 14, 2002

Corn maturities for late-May planted corn

D. R. Hicks, Agronomy and Plant Genetics

A major portion (76%) of the Minnesota corn crop has been planted with the remainder delayed because of wet soil conditions and growers may wonder about the maturities of the hybrids they will be planting. Growers have made hybrid choices based on maturities for their normal planting dates. Growers should "stay the course" with their hybrid choices if they can plant by or prior to May 25. If planting does not occur by May 25, then consider maturities as given in Table 1.

Tuesday, January 1, 2002

Growth and development guide for spring barley

P.M. Anderson, E.A. Oelke, and S.R. Simmons1

six-and-two-rowed barley
Figure 1. Six-rowed (left) and two-rowed (right) barley heads.
Barley ( Hordeum vulgare L.) originated in the Eastern Mediterranean region. Barley can be distinguished by differences in head type and growth habits. In a six-rowed barley, three kernels are formed at each node of the head while in a two-rowed type, only a single kernel forms at each node (Figure 1).

Barley is also classed by its requirement for cold temperatures. Winter barley must be planted so that seedlings will be exposed to cold (vernalized), which enables it to later produce heads and grain normally. Winter barley is usually sown in the fall for exposure to low temperatures during the winter and then development is completed during the following spring and summer. Spring barley does not require exposure to winter temperatures and can be sown in spring. Winter types usually mature somewhat earlier than spring types. Growth and development of the six-rowed spring barley commonly grown in Minnesota will be considered here. Figure 2 shows major developmental stages in spring barley with the approximate time and heat units required to reach each stage. Differences in maturity exist among varieties.
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