Integrated Crop Management News

Links to these articles are strongly encouraged. Articles may be republished without further permission if published as written and if credit is given to the author, Integrated Crop Management News, and Iowa State University Extension and Outreach. If articles are used in any other manner, permission from the author is required.

Hayfield Lodging – Management Concerns and Guidelines

June 13, 2008

By Stephen K. Barnhart, Department of Agronomy and Mark Hanna, Department of Agricultural and Biosystems Engineering  

Rain, wind, hail, and unavoidable harvest delays have led to lodged and flat hayfields across the state. This is not usually a concern in more normal seasons, but if it occurs, producers have to manage for and around it.  

A ‘bright side’ of delayed harvest is that the forage plants have longer to accumulate carbohydrate ‘stores’ and maintain plant vigor. 

Measuring the Nitrogen Status

June 12, 2008
Image of N-deficient corn and well-fertilized, non-N limiting strips

This year the corn growth is behind, and with the wet soils some fields will be sampled later than normal. Late sampling may complicate test interpretation.

Managing Manure Storage Structures During Wet Weather

June 12, 2008

By Robert Burns, Department of Ag and Biosystem Engineering 

During excessively high rainfall periods Iowa producers with open manure storages should closely monitor manure levels to prevent these structures from over-topping.

Good Seed Supply Available from Most Companies in Iowa

June 12, 2008

By Palle Pedersen and Roger Elmore, Department of Agronomy

Excessive rainfall in Iowa over the last 2 months has challenged most farmers, agronomists, extension workers, and researchers. With another front of storms moving into Iowa today (June 11) we do not know when we will be able to get back into the fields. Our best estimate is that it will first be next week at the earliest.

Estimating Nitrogen Losses

June 11, 2008

By John Sawyer, Department of Agronomy

One method to judge nitrogen (N) loss is to calculate an estimate. Predicting the exact amount is quite difficult as many factors affect losses. However, estimates can provide guidance for supplemental N applications.

Rainfall has Affected Hay and Hay-Crop Silage Harvest

June 10, 2008

By Stephen K. Barnhart, Department of Agronomy

Hay is an agricultural product that varies greatly in nutritional quality. The ‘hay market’ frequently uses descriptive terms like ‘dairy quality,, ‘beef-cow quality’ or more quantitative terms like ‘premium,’ ‘good’, and ‘fair’; which have some forage testing guidelines to place hay lots in these categories.

Nitrogen Loss – How Does it Happen?

June 10, 2008

By John Sawyer, Department of Agronomy

Much of Iowa is experiencing excessively wet conditions this spring. With the continued large rainfalls and flooding conditions, nitrogen (N) loss is an issue. While the wet period early this spring had an influence on N in the soil, excessively wet conditions now are especially critical for N losses due to warm soils and considerable conversion of applied fertilizer and manure N to nitrate.