Effects of factorial combinations on urea, dicalcium phosphate, gypsum and potassium chloride on growth and foliage composition of closely spaced Pinus radiata
1985
Snowdon, P. | Waring, H.D. (Commonwealth Scientific and Industrial Research Organization, Canberra (Australia). Div. of Forest Research)
P at 234 kg per ha increased biomass production at 4.5 years of age 8-fold or, in the presence of 501 kg N per ha, 14-fold. Growth was suppressed when the N:P ratio of added fertilizer exceeded 6:1 and when urea was added in the absence of phosphate. There was no growth response to the other two fertilizers. Biomass production was related to foliar P concentration but not to total N. The relationship was slightly better with separation into soluble and insoluble N. Concentrations of Ca, Mg and S were all near to critical levels. Concentrations of these, K, Fe, Mn, Zn, Cu, B and Al were all affected by fertilizer. Some of the changes could be attributed to growth dilution effects but others were apparently due to enhanced root exploration or changes in soil-nutrient availability. Shortly after fertilization there was a hyperbolic relationship between soluble N and inorganic S.
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