ﺗﺄﺛﯿﺮ ﺗﺎرﯾﺦ ﻫﺎي ﮐﺎﺷﺖ ﻣﺨﺘﻠﻒ ﺑﺮ ﺑﺮﺧﯽ ﺧﺼﻮﺻﯿﺎت ﻣﻮرﻓﻮﻟﻮژﯾﮑﯽ ارﻗﺎم ﺷﺒﺪر در ﺑﺮداﺷﺖ ﭘﺎﯾﯿﺰه

The effect of different planting dates on some morphological characteristics of clover cultivars in the autumn’s harvest

ﺑﻪ ﻣﻨﻈﻮر ﺑﺮرﺳﯽ ﺗﺄﺛﯿﺮ ﺗﺎرﯾﺦ ﻫﺎي ﻣﺨﺘﻠﻒ ﮐﺎﺷﺖ ﺑﺮ ﺑﺮﺧﯽ ﺧﺼﻮﺻﯿﺎت ﻣﻮرﻓﻮﻟﻮژﯾﮑﯽ ارﻗﺎم ﺷﺒﺪر، آزﻣﺎﯾﺸﯽ ﻣﺰرﻋﻪ اي ﺑﻪ ﺻﻮرت ﮐﺮتﻫﺎي ﺧﺮد ﺷﺪه در ﻗﺎﻟﺐ ﻃﺮح ﺑﻠﻮكﻫﺎي ﮐﺎﻣﻞ ﺗﺼﺎدﻓﯽ ﺑﺎ ﺳﻪ ﺗﮑﺮار ﻃﯽ ﺳﺎل زراﻋﯽ 95 -1394 در ﻣﺆﺳﺴﻪ ﺗﺤﻘﯿﻘﺎت اﺻﻼح و ﺗﻬﯿﻪ ﻧﻬﺎل و ﺑﺬر ﮐﺮج اﺟﺮا ﺷﺪ. ﻓﺎﮐﺘﻮر اﺻﻠﯽ ﺷﺎﻣﻞ دو ﺗﺎرﯾﺦ ﮐﺎﺷﺖ )1 و 25 ﻣﺮداد( و ﻓﺎﮐﺘﻮر ﻓﺮﻋﯽ ﺷﺎﻣﻞ ﭼﻬﺎر رﻗﻢ ﺷﺒﺪر اﯾﺮاﻧﯽ ﯾﮏ ﭼﯿﻦ، ﺷﺒﺪر اﯾﺮاﻧﯽ ﭼﻨﺪ ﭼﯿﻦ، ﺷﺒﺪر ﺑﺮﺳﯿﻢ و ﺷﺒﺪر ﻻﮐﯽ( ﺑﻮد. ﻧﺘﺎﯾﺞ ﺗﺠﺰﯾﻪ وارﯾﺎﻧﺲ ﻧﺸﺎن داد ﮐﻪ ﺗﺄﺛﯿﺮ رﻗﻢ ﺑﺮ ارﺗﻔﺎع ﺑﻮﺗﻪ، ﺿﺨﺎﻣﺖ ﺳﺎﻗﻪ و ﻃﻮل ﻣﯿﺎنﮔﺮه در ﺳﻄﺢ اﺣﺘﻤﺎل ﯾﮏ درﺻﺪ ﻣﻌﻨﯽ دار ﺑﻮ.د ﻋﻼوه ﺑﺮاﯾﻦ اﺛﺮ ﺗﺎرﯾﺦ ﮐﺎﺷﺖ و اﺛﺮ ﻣﺘﻘﺎﺑﻞ ﺗﺎرﯾﺦ ﮐﺎﺷﺖ و رﻗﻢ ﺑﺮ ﺿﺨﺎﻣﺖ ﺳﺎﻗﻪ و ﻃﻮل ﻣﯿﺎنﮔﺮه ﻣﻌﻨﯽدار ﺷﺪ. ﺑﺎﻻﺗﺮﯾﻦ ارﺗﻔﺎع ﺑﻮﺗﻪ ﺗﻮﺳﻂ ﺷﺒﺪر ﺑﺮﺳﯿﻢ در ﺗﺎرﯾﺦ ﮐﺎﺷﺖ اول ﻣﺮداد ﺑﻪ دﺳﺖ .آﻣ ﺪ ﺣﺪاﮐﺜﺮ ﺿﺨﺎﻣﺖ ﺳﺎﻗﻪ در رﻗﻢ اﯾﺮاﻧﯽ ﯾﮏ ﭼﯿﻦ و ﺗﺎرﯾﺦ ﮐﺸﺖ اول ﻣﺮداد ﻣﺸﺎﻫﺪه ﺷﺪ درﺣﺎﻟﯽ ﮐﻪ ﺑﺎﻻﺗﺮﯾﻦ ﻃﻮل ﻣﯿﺎنﮔﺮه ﻣﺘﻌﻠﻖ ﺑﻪ رﻗﻢ اﯾﺮاﻧﯽ ﭼﻨﺪ ﭼﯿﻦ و ﺗﺎرﯾﺦ ﮐﺎﺷﺖ اول ﻣﺮداد ﺑﻮد.

To evaluate the effect of different planting dates on some morphological characteristics of clover cultivars, a field experiment was conducted in a split-plot based on a randomized complete block design (RCBD), with three replications during 2015-16 growing season at the Seed and Plant Improvement Institute, Karaj, Iran. The main factor consisted of two planting dates (23 July and 16 August) and sub-factor included four cultivars (mono-cut Persian clover, multi-cut Persian clover, Berseem clover, and Crimson clover). The results of variance analysis showed that the effect of cultivar on plant height, stem thickness and internode length was significant (P≤0.01). In addition, the effect of planting date and the interaction of planting date × cultivar on stem thickness and internode length were significant. The highest plant height was obtained by Berseem clover at the planting date of 23 July. The maximum stem thickness was observed in the mono-cut Persian clover and the planting date of 23 July, while the highest length of the internode belonged to multi-cut Persian clover and the planting date of 23 July.