Availability of Phosphorus after Long‐term Whole and Separated Slurry Application to Perennial Grass prior to Corn Silage
Removing solids from whole dairy slurry (WS) can reduce P loading on fields. This study investigated the effects of 11 yr of applications of WS, separated liquid fraction (LF), commercial fertilizer, WS plus fertilizer, and a control on total and extractable (Kelowna) soil P in perennial grass (Fest...
Saved in:
Published in | Journal of environmental quality Vol. 47; no. 4; pp. 893 - 901 |
---|---|
Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
United States
The American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc
01.07.2018
|
Online Access | Get full text |
Cover
Loading…
Summary: | Removing solids from whole dairy slurry (WS) can reduce P loading on fields. This study investigated the effects of 11 yr of applications of WS, separated liquid fraction (LF), commercial fertilizer, WS plus fertilizer, and a control on total and extractable (Kelowna) soil P in perennial grass (Festuca arundinacea Schreb.) and two subsequent silage corn (Zea mays L.) crops. Plots received 200 kg N ha−1 with or without 40 kg P ha−1. Shoot biomass, P uptake, arbuscular mycorrhizal fungi root colonization, and soil microbial P were determined for corn at six leaves. Whole‐crop and grain yield, P uptake, dry matter, and grain content were determined at maturity. The LF treatment received 30% less manure P than WS, had lower extractable soil P at 0 to 15 and 15 to 30 cm, and had lower total P at 0 to 15 cm. Historical treatments had no effect on soil microbial P or arbuscular mycorrhizal fungi colonization. At six leaves, corn shoot biomass, P concentration, and P uptake were related to historical P rates in Year 2, but the relationship was not apparent in Year 1. Starter P fertilizer increased shoot yield and P uptake for all treatments in both years. At maturity, most yield parameters for WS and LF were similar in Year 1, but in Year 2, there was a significant response to starter P fertilizer and a positive relationship between historical P rate and corn performance. This study shows that long‐term LF treatments reduced the risk of P pollution with relatively little effect on the P response of subsequent corn crops.
Core Ideas
Historical N‐based LF treatments had lower P surplus and soil P than WS.
Long‐term WS and LF treatments had no effect on AMF and soil microbial P.
Juvenile corn responds to starter P in high‐P‐testing soils.
The residual effects of long‐term LF on subsequent corn were small.
Use of LF may help reduce soil P accumulation on dairy farm soils. |
---|---|
Bibliography: | Assigned to Associate Editor Donnacha Doody Supplemental material is available online for this article. All rights reserved. ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0047-2425 1537-2537 |
DOI: | 10.2134/jeq2017.12.0466 |