Die Bodenkultur - Journal for Land Management, Food and Environment
H. Iran-Nejad and N. Schahbazian:
Study of the effects of different levels of N and P fertilizers on fruit yield of Anise (Pimpinella anisum)
In order to determine the effects of N and P fertilizers on anise fruit yield a greenhouse experiment which carried out 12 treatments (a combination of 4 _ 3 levels of N and p, respectively) was conducted. The studied factors were N application in 3 levels (N0, N0.077, N015 gr/pot as urea 46 %) and P application in 4 levels (P0, P0.077, P0.15, P0.23 gr/pot as triple phosphate 46 %). The experiment design had a factorial arrangement with five completely randomized replications. The results indicated that the simple and combined effects of both N and P fertilizers on anise fruit yield were significant. Also increasing of applied nitrogen could result in increasing of fruit yield. This trend was not observed in studied P levels, as increasing of P levels was not accompanied by continuous increasing of fruit yield which demonstrated diminishing return of the response-input curve to P increment. Finally our results revealed that increasing of N could affect anise fruit yield more than P increment. In this study the highest value for fruit yield was related to N0.15P0.15 treatment (13.92 gr/pot), which caused 75 % increment in fruit yield in comparison with control treatment (N0P0). Our final results showed that increasing of studied fertilizers, especially N fertilizer, in a special range could be advisable to farmers to produce more yield and sustain their farms economically.
Key words: Anis, Pimpinella anisum, phosphor, nitrogen, fertilization.