| Abstract: | A field experiment on an alluvial clay loam soil at Giza revealed that the dry matter yield, as well as N and P uptake of Ammi visnaga fruits or herb were significantly increased with nitrogen application up to 60 kg N/ha. P application up to 30 kg P205/ha significantly increased the dry matter yield and the uptake of N and P of herb, but did not significantly affect those of fruits. At maturity, most, if not all, chromones rest in the fruits. The concentration in herb (Stems + rays) did not exceed 0.01 %. Higher yields of total chomones, khelling and visnagin in fruits were brought about with nitrogen application at the rate of 60 kg N/ha. P application tends to increase all these parameter, yet all were nonsignificant. The interacting effect between nitrogen and phosphorus on these characters was insignificant. Plant analysis of leaves, stem, or shoot at 120, 135 and 150 days old plants revealed no relation between phosphorus concentration and final yield. However, nitrogen concentrations provided a good tool to evaluate the nutritional status of the plants. The critical level was 2.75, 1.85, or 1.45 % N in shoots of 120, 135, or 150 days old plants. The P % in these shoots was around 0.35–0.50 %. |
