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This article in SSSAJ

  1. Vol. 67 No. 4, p. 1186-1194
     
    Received: Dec 31, 2001
    Published: July, 2003


    * Corresponding author(s): cavigelm@ba.ars.usda.gov
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doi:10.2136/sssaj2003.1186

Phosphorus Bioavailability following Incorporation of Green Manure Crops

  1. Michel A. Cavigelli *a and
  2. Steve J. Thienb
  1. a USDA-ARS, Sustainable Agricultural Systems Lab., Henry A. Wallace Beltsville Agricultural Research Center, Bldg. 001, Rm 140, 10300 Baltimore Ave., Beltsville, MD 20770
    b Dep. of Agronomy, Kansas State Univ., Manhattan, KS 66506

Abstract

Incorporating green manure crops into soil may increase P bioavailability for succeeding crops. We conducted a greenhouse study to evaluate the effects of green manures on biomass and P utilization of a succeeding grain sorghum [Sorghum bicolor (L.) Moench] crop. Four perennial forages and four winter annual cover crops were grown in pots, killed, and incorporated into the soil before planting sorghum in the same pots. Sorghum P uptake was positively correlated with perennial forage P uptake. Among winter cover crops, sorghum P uptake following white lupine (Lupinus albus L.) was lower than in all other treatments, including the control (no previous cover crop), even though lupine biomass, N content, and P uptake were two to three times greater than those of the other winter cover crops. Phosphorus uptake differed slightly among the other three winter cover crops but sorghum P uptake was not correlated to winter cover crop P uptake. Thus, among winter cover crops, plant type rather than P uptake seemed to influence the subsequent sorghum crop's P uptake. However, sorghum biomass following the three winter cover crops other than lupine was greater than sorghum biomass in the control treatment, indicating that there was a beneficial cover crop rotation effect among these three winter cover crops. Soil samples were collected and analyzed for Bray-1 P when green manure crops were planted, when they were incorporated into the soil, when sorghum was planted and when sorghum was harvested. These data showed that the Bray-1 soil P test has little potential to predict differences in P uptake and release among different types of green manures and it has limited potential to predict P uptake by sorghum following incorporation of green manures.

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Copyright © 2003. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.67:1186–1194.