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The use of nutrient bioassays to assess the response of Eucalyptus grandis to fertilizer application. 2. A field experiment

, : The use of nutrient bioassays to assess the response of Eucalyptus grandis to fertilizer application. 2. A field experiment. Canadian Journal of Forest Research 23(1): 7-13

The nutrient status of a Eucalyptus grandis Hill ex Maiden field fertilizer experiment in Natal, South Africa, was assessed at 6 and 18 months by a bioassay test in which the rate of influx of 15N, 32P, and 86Rb in roots excised from trees was measured. Fertilizer treatments consisted of all combinations of two levels of nitrogen (N), phosphorus (P), potassium (K), and trace elements, applied at planting and at either 3 or 6 months. There were also untreated control plots. At 6 months, bioassay influx rates of the three isotopes by the roots were all higher when a nutrient was applied at a lower level than when it was applied at a higher level. Foliar analysis did not indicate that any of the trees were deficient in N, P, or K, although control plants were significantly smaller than fertilized ones. There was no difference in the foliar P or K content between the treatments, although percent N increased with increasing application of N. The greatest difference in the root response between fertilizer levels was in the influx of 15N. Height of the trees was significantly increased by increasing N levels. There was no effect of P or K levels, but there was a negative effect of the combination of high levels of K and trace elements. From the significant drop in root 15N influx following the 6 month fertilizer addition, growth of the trees in response to fertilizer was predicted at 18 months of age trees receiving their second application of fertilizer at 6 months were as large as those receiving fertilizer at 3 months, confirming growth predictions based on root bioassay data. The bioassay results at 18 months suggested that P may be supplanting N as the major growth limiting factor at this later stage in the development of the stand.

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Accession: 002530503

DOI: 10.1139/x93-002

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Gopachenko, I.M.; Somov, G.P., 1969: Small mammals and Trombiculid mites of southern Sakhalin and their role in the circulation of the causal agent of tsutsugamushi fever. In the Soviet Union, the first natural focus of tsutsugamushi disease was found in 1963 in the Maritime Province of the Soviet Far East. Since at one time the island of Sakhalin formed part of the mainland, investigations were carried out there in...

Cooke D. W., 1976: Glacial-interglacial sedimentation changes in the Antarctic Ocean. Abstracts with Programs Geological Society of America: Pages 820-821. 1976.

Grace, Mark, 2001: Field guide to requiem sharks (Elasmobranchiomorphi: Carcharhinidae) of the western North Atlantic. Identification problems are common for many sharks due to a general lack of meristic characteristics that are typically useful for separating species. Other than number of vertebrae and number and shape of teeth, identifications are frequently bas...

Zhang, K.; Kang, J.U., 2010: Real-time 4D signal processing and visualization using graphics processing unit on a regular nonlinear-k Fourier-domain OCT system. We realized graphics processing unit (GPU) based real-time 4D (3D+time) signal processing and visualization on a regular Fourier-domain optical coherence tomography (FD-OCT) system with a nonlinear k-space spectrometer. An ultra-high speed linear...

Romanova, G.I.; Vvedenskaia, M.P.; Romanov, V.A.; Malafeeva, Z.V.; Zavadskiĭ, V.N., 1979: Characteristics of cellular and humoral factors of immunity in chronic gonorrhea in the process of treatment. Vestnik Dermatologii i Venerologii: 31-34

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