ISHS Acta Horticulturae 73: I International Symposium on Spices and Medicinal plants
THE EFFECT OF BAND PLACED NITROGEN AND PHOSPHORUS FERTILISER ON THE YIELD OF POPPIES (PAPAVER SOMNIFERUM L.) GROWN ON KRASNOZEM SOIL |
| Author: | J.C. Laughlin |
| DOI: | 10.17660/ActaHortic.1978.73.21 |
| Abstract:
In Tasmania, experiments have studied the effect of nitrogen and phosphorus fertilisers and their placement position on the growth of poppies(Papaver somniferum L.)on krasnozem soils of high phosphorus fixation capacity. These experiments have considered early P uptake, dry matter production of various plant components and morphine yield. In a pot experiment radioactive monocalcium phosphate was banded either 40 or 75 mm directly below the seed at rates up to the equivalent of 200 kg/ha P. when the plant tops were harvested fifty days after sowing the uptake of fertiliser P was much greater from the 40 mm band. In a field experiment, factorial combinations of ammonium sulphate up to 50 kg/ha N and superphosphate up to 80 kg/ha P were banded 25 mm below the seed. When harvested at dry commercial maturity, yield responses of capsule, seed and capsule morphine to N application only occurred at the highest level of P. A further field experiment with banded N and P at similar levels studied the accumulation of dry matter when whole plants were harvested at weekly intervals between flowering and dry maturity. The mean effect on total capsule yield over all harvests was similar to the previous experiment. However, when the plants were partitioned into components, terminal capsule yield was depressed by high levels of P but this was more than compensated by large yield increases with lateral capsules. | |
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