Nutrition of container‐grownAcalypha hispaniolae
作者:
M. B. Thomas,
M. I. Spurway,
B. A. J. Richards,
G. Wells,
期刊:
New Zealand Journal of Crop and Horticultural Science
(Taylor Available online 1998)
卷期:
Volume 26,
issue 1
页码: 27-33
ISSN:0114-0671
年代: 1998
DOI:10.1080/01140671.1998.9514036
出版商: Taylor & Francis Group
关键词: Acalypha hispaniolae;nutrition;foliage plants
数据来源: Taylor
摘要:
Rooted cuttings ofAcalypha hispaniolaewere grown in peat/composted bark (7: 3 v/v) medium for 4 months to evaluate their response to five levels of nitrogen (N), phosphorus (P), potassium (K), and lime. There was a linear response to added N with foliar dry matter increasing over the range 0–600 g N/m3and a leaf N content of c. 3.3% at this highest rate of N. Predicted maximum flower dry weight occurred at 400 g N/m3. P additions suppressed growth and flowering. Foliage P content needs to be held at c. 0.2%. Chlorosis of mature leaves was most severe with N deficiency but was also caused by P toxicity. Chlorosis in immature leaves was attributed to P‐induced iron deficiency and was most severe when the P: Fe ratio in the leaves was 62: 1. Liming reduced P toxicity and the lime rate for maximum growth was 6–9 kg/m3and a pH of c. 5. K additions had little effect on growth. A foliage K content of c. 2% is recommended.
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