جستجوی مقالات مرتبط با کلیدواژه « زمان جمع آوری بذر » در نشریات گروه « آبخیزداری، بیابان، محیط زیست، مرتع »

    This study aimed to determine the best time of seed collection for Artemisia sieberi and Artemisia aucheri in Saleh abad rangelands of Baft County, Kerman province. After selecting a key area, the time of seed collection started from mid-November to end of January for Artemisia aucheri and from mid-October to mid-December for Artemisia sieberi.  The seeds were evaluated for germination traits including germination percentage, germination rate, root length, shoot length, and vigor index. The data were analyzed, and the Duncan test was used to compare the mean values of treatments. The results showed that the delay in the time of seed collection of Artemisia sieberi from mid November to mid December caused an increased germination percentage, germination rate, seed vigor, and seedling length as 115, 119, 222, and 49%, respectively. The seeds of Artemisia aucheri collected in the first half of December compared to the first half of November increased seed vigor index, germination percentage, germination rate, and seedling length as 588, 336, 736, and 61%, respectively.  Our finding showed that the delay in the time of seed collection in both of these species improved seed germination traits and seedling growth.

One of the most important plans for range improvement is the production of suitable seeds. To achieve this goal and to detect highest germination rate the harvesting time should be regulated, so that the seeds must be both matured and not scattered. In this study the optimal dates of seed harvesting of three range plants including Salsola rigida, Zygophyllum eurypterum and Ferula ovina are investigated. Seed harvesting was done in different stages from physiological maturation time to seed falling. S. rigida seeds were collected on September 22th, 29th and October 6 th, 13th and 27th and November 3th and 10th at 2004, and Z. eurypterum and F. ovina on June 30th and July 7th, 14th and 21th at 2005. From each stage 400 dried seeds in four replications were tested in petridish. Germinated seeds were counted during 21 days.
The results of this experiment showed, there is a significant difference between various seed harvesting times of S. rigida. The highest germination rate of this plant is on Nov. 10th (75%), and the lowest rate is on Sep. 22th (7.3%). No significant difference was detected for Z. eurypterum. The highest rate of germination of Z. eurypterum was on June 30th (61%) and the lowest one was on July 21th (46%). F. ovina seeds had the highest rate of germination (54%) on July 21th and the least rate of germination on June 30th and July 14th (37%). There is also a significant difference in harvesting rate of this plant referring to different times. According to the achieved results of this study, harvesting delay increases germination rates of S. rigida and F. ovina, while this parameter has no effect on Z. eurypterum. This variable is considered as a clue in selecting optimal time of seed harvesting.