Journal
JOURNAL OF PLANT NUTRITION
Volume 35, Issue 11, Pages 1705-1724Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2012.698351
Keywords
nitrogen; phosphorus; Withania; alkaloid content; medicinal plant; macronutrient
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The optimum dose of nitrogen (N) and phosphorus (P) for Withania somnifera was determined by utilizing graded levels of 0, 30, 45 and 60 kg ha(-1) N and 0, 13, 26 and 40 kg ha(-1) P in two separate simple randomized pot experiments. Soil-application of 45 kg N ha(-1) and 26 kg P ha(-1) proved the best dose for increasing shoot and root length, leaf area, fresh and dry weight of shoot and root, total chlorophyll and leaf-N, P, and potassium (K) content, nitrate reductase, and carbonic anhydrase activity, total alkaloid content, seed-yield per plant, root-yield per plant and berries per plant. While 30 kg N ha(-1) proved best for root length, fresh and dry weights, as well as root-yield per plant. However, the effect of N and P fertilizers on carotenoid content, seeds per berry and 100-seed weight were insipid. Leaf-P remained unaffected by nitrogen application.
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