Subsoil Moisture Levels a Concern for Northwest Iowa 2012 Crops

The northwest Iowa fall survey of subsoil moisture completed by Iowa State University in November shows well below average amount of subsoil moisture. Subsoil moisture levels are checked in the fall in many northwest Iowa counties through this survey

Subsoil Moisture Levels are Still a Concern for 2012 Crops

The Iowa State University spring survey of subsoil moisture in northwest Iowa indicates below normal amounts of subsoil moisture in most areas. The exception was near Rossie where the subsoil moisture was 1.3 inches above normal. Subsoil moisture levels are surveyed in pre-determined areas each spring and fall

Deep-Tillage Study—Northwest Research Farm

A deep-tillage study was started during the fall of 2003 to evaluate the effects of deep (~20 in.) preplant tillage on corn and soybean yields

Soybean Fungicide Phytotoxicity Study, Northwest Research Farm

This study was done to evaluate the potential leaf burn (phytotoxicity) of two fungicides on 32 commonly grown soybean varieties. These 32 varieties represented diverse genetic backgrounds and ranged in maturity from late maturity group (MG) 0 to late MG II. Most of the varieties were in the late MG I to early MG II maturity range and would be commonly grown in northern Iowa

Soybean Fungicide Demonstration

Nine different fungicides were evaluated at the Northwest Research Farm in 2005. The products that are labeled as section 3 and section 18 fungicides for the management of Asian soybean rust were included in this study

Soybean Fungicide Demonstration at the Northwest Iowa Research Farm

Eleven different fungicide treatments were evaluated on soybean at the Northwest Research Farm in 2006. The fungicides were evaluated because of the threat of Asian soybean rust and the potential yield benefit that fungicides may provide without the presence of leaf disease

Effects of Eggshell and Ag Lime Applications on Soil pH and Crop Yields

The Northwest Research Farm (NWRF) in Sutherland was selected as a site to research the effect of eggshell application and the effect of ag lime on soil pH and crop yields (Table 1). The research area was identified in April 2002 at the recently acquired 120-acre tract of land adjacent to the NWRF location. In April 2002, the research area had an initial pH of 5.4 and phosphorus and potassium levels were 24–31 ppm and 151–215 ppm, respectively

Soybean Variety by Fungicide Demonstration at the Northwest Research Farm

There is an interest in the evaluation of foliar fungicides since Asian soybean rust was discovered in the continental United States. Fungicides have been evaluated for their effectiveness against leaf diseases and for their potential yield enhancement when diseases are not present

Lime and Tillage Research Project

Farmers growing corn and soybean in northwest Iowa have to consider the cost of ag lime when liming their soils. This is because of high limestone cost and the fact that the soils in northwest Iowa have high pH subsoil. The high pH subsoil moderates the potential negative effect on crop production from acid surface soil. Another factor that must be considered is the variable mixing of limestone into the soil with different tillage systems. The different amounts of soil mixing among no-tillage systems, ridge-tillage systems, and full-width tillage systems may affect the amount of limestone needed to correct soil pH and liming effect on crop yield