NDLI: Growth response to fertilisation and recovery of 15N-labelled fertiliser by young hoop pine plantations of subtropical Australia

Content Provider	Springer Nature Link
Author	Bubb, K.A. Xu, Z.H. Simpson, J.A. Safligna, P.G.
Copyright Year	1999
Abstract	The stand growth responses to fertilisation were investigated in 1-year-old and 5-year- old second rotation (2R) hoop pine (Araucaria cunninghamii) plantations in subtropical Australia. At the 1-year-old plantation, 4 rates of nitrogen (N) fertiliser (0, 20, 60 and 120 kg N ha-1) were banded either with or without basal fertilisers (BF) containing 60 kg P ha-1 and 50 kg K ha-1. In the 5-year-old plantation, 4 rates of N fertiliser (0, 100, 300, 600 kg N ha-1) were banded with or without the BF. At both sites N fertiliser was applied as ammonium sulphate in 4 equal split dressings over 2 growing seasons. 15N-labelled ammonium sulphate was also used at the 5-year-old plantation in conjunction with the 100 kg N ha-1 treatment. The 15N-labelled fertiliser was applied to 3 trees during the first split application in spring, and to 3 more trees during the second split application in midsummer. The 15N-labelled trees were harvested and the surrounding soil excavated 6 months after the second 15N application. In the 1-year-old plantation, no stand growth response to fertilisation was noted, indicating that fertilisation at plantation establishment was unlikely to increase plantation productivity. In contrast, a significant stand response to N fertilisation was demonstrated at the 5-year-old site. There were no significant differences between the plus N treatments and the increase in basal area and volume due to N fertilisation 2.3 years after commencement of the trial was 45.1 and 43.5%, respectively. No response to basal fertiliser was observed. The mean 15N recovery from the soil–plant system was 79%, with no significant difference noted between the two split applications. The mean 15N recovery in the tree biomass was 56%, with the majority being partitioned into the foliage. On average 21% of the applied 15N could not be accounted for, and was assumed to be lost from the soil–plant ecosystem.
Starting Page	81
Ending Page	92
Page Count	12
File Format	PDF
ISSN	13851314
Journal	Nutrient Cycling in Agroecosystems
Volume Number	54
Issue Number	1
e-ISSN	15730867
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Soil Science & Conservation
Content Type	Text
Resource Type	Article
Subject	Agronomy and Crop Science Soil Science

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