Login | Request Account (DAF staff only)

Macadamia yield and quality responses to phosphorus

View Altmetrics

Stephenson, R.A., Gallagher, E.C. and Pepper, P.M. (2002) Macadamia yield and quality responses to phosphorus. Australian Journal of Agricultural Research, 53 (10). pp. 1165-1172. ISSN 1836-0947


Article Link: https://doi.org/10.1071/AR02012


Phosphorus fertiliser was applied to mature macadamia trees on 3 plantations with relatively low soil P in south-eastern Queensland at rates of 0, 10, 20, 40, 80, 160, and 320 kg P/ha at El Briale and Como Park and 0, 15, 30, 60, 120, 240, and 480 kg P/ha at Haylock. High rates of P were being applied to macadamias throughout the Australian industry and this study was designed to provide a basis for determining optimum application rates and critical soil P levels. Soil P was 33–199.5, 38.1–267.0, and 62.3–253.0 mg/kg at El Briale, Como Park, and Haylock, respectively. A tentative critical soil P concentration of 84–88 mg/kg was indicated, based on relative yields at El Briale and Haylock. Yield responsiveness to applied P was greatest at Haylock on a heavy soil that may have adsorbed P more readily, and had a higher P buffer capacity, than the lighter soils at the other sites. Leaf P was unresponsive to applied P, and hence soil P in this study. This is of concern since leaf P is used extensively to guide nutrition management. Further work is required to clarify relationships between leaf and soil P concentrations.

Item Type:Article
Subjects:Plant culture > Fruit and fruit culture > Nuts
Live Archive:12 Jan 2024 05:16
Last Modified:12 Jan 2024 05:16

Repository Staff Only: item control page


Downloads per month over past year

View more statistics