About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 38 No. 2, p. 520-528
     
    Received: Feb 5, 2008
    Published: Mar, 2009


    * Corresponding author(s): rweil@umd.edu
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq2008.0066

Brassica Cover Crops for Nitrogen Retention in the Mid-Atlantic Coastal Plain

  1. Jill E. Dean and
  2. Ray R. Weil *
  1. 1109 HJ Patterson Hall, Dep. of Environmental Science and Technology, Univ. of Maryland, College Park, MD 20742

Abstract

Brassica cover crops are new to the mid-Atlantic region, and limited information is available on their N uptake capabilities for effective N conservation. Forage radish (Raphanus sativus L. cv. Daikon), oilseed radish (Raphanus sativus L. cv. Adagio), and rape (Brassica napus L. cv. Dwarf Essex) were compared with rye (Secale cereale L. cv. Wheeler), a popular cover crop in the region, with regard to N uptake ability and potential to decrease N leaching at two sites in Maryland. Plants were harvested in fall and spring for dry matter and N analysis. Soil samples from 0 cm to 105 to 180 cm depth were obtained in fall and spring for NH4–N and NO3–N analyses. Ceramic cup tension lysimeters were installed at depths of 75 to 120 cm to monitor NO3–N in soil pore water. Averaged across 3 site-years, forage radish and rape shoots had greater dry matter production and captured more N in fall than rye shoots. Compared with a weedy fallow control, rape and rye caused similar decreases in soil NO3–N in fall and spring throughout the sampled profile. Cover crops had no effect on soil NH4–N. During the spring on coarse textured soil, pore water NO3–N concentrations in freeze-killed Brassica (radish) plots were greater than in control and overwintering Brassica (rape) and rye plots. On fine textured soil, all cover crops provided a similar decrease in pore water NO3–N concentration compared with control. On coarse textured soils, freeze-killed Brassica cover crops should be followed by an early-planted spring main crop.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © 2009. American Society of Agronomy, Crop Science Society of America, Soil Science SocietyAmerican Society of Agronomy, Crop Science Society of America, and Soil Science Society of America