|
|
Dairy pasture responses to soil physical properties.
- Article from:
-
Australian Journal of Soil Research
- Article date:
-
January 1, 2004
- Author:
-
;
;
;
;
;
|
Copyright informationCOPYRIGHT 2004 CSIRO Publishing. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
|
Relationships between relative seasonal pasture yields (total, spring, or summer/autumn) and soil physical properties were investigated. Dairy farm data were collected from trials over 7 years. There were few significant response relationships between total relative yield and each soil physical property at each soil depth, from 0 to 20 cm. Macroporosity (air-filled porosity; pores >30 [micro]m), percentage of pores >300 [micro]m, and total porosity at both 0-5 and 5-10 cm soil depths all had highly significant positive relationships with spring relative yield, with the best fit being for macroporosity. Summer/autumn relative yield had significant but negative relationships with ...
<0.00l) relationships with spring relative yield (Table 2). The best fit (RMS = 0.0108) was for macroporosity at 5 10 cm, representing a 26% increase in variance accounted for, with no added soil physical terms (RMS = 0.0146). Close fits (RMS = 0.0111) were also obtained with bulk density and total porosity at 5 10 cm. At 0-5 cm, the best fit relationship was for percentage of pores>