ISHS Acta Horticulturae 318: II International Symposium on Specialty and Exotic Vegetable Crops
FERTILITY REQUIREMENTS OF VEGETABLE AMARANTH (AMARANTHUS TRICOLOR L.) IN AN UPLAND MINERAL SOIL OF THE MID-SOUTH |
| Author: | D.J. Makus |
| Keywords: | Nitrogen, phosphorus, potassium, plant nutrition |
| Abstract:
Biomass production of amaranth cultivars (cvs) 'Hinn Choy' and 'RRC 241' were most responsive to increasing levels of supplemental P (to 90 kg/ha) and less responsive to increasing levels of supplemental K (to 180 kg/ha). 'Hinn Choy', but not 'RRC 241', responded to supplemental N (to 270 kg/ha). Average yield increases from N, K and P were 1.15, 1.27 and 14.5 fold, respectively. Supplemental P increased leaf number per plant and the percentage of non-edible stem tissue in both cvs. Plant water content was increased by K and P. In a mineral soil testing 59 kg N, 14 kg P and 84 kg K/ha, P was the most critical nutrient needed by both vegetable amaranth cvs. | |
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