Investigation on the influence of depth planting and summer irrigation saffron yield and population of Rhizoglyphus robini the cause of corm rot in Gonabad.
2007
Rahimi, Hassan | Mokhtariyan, Ali | Rahimi, Hossein | A`raqi, Mahdi | A`ssari, Ali | Behdad, Mohammad | Sa`idi, Morteza
Saffron one of the most important horticultural crops in the South Khorasan. There are many families that earn their livelihood with Saffron planting and it makes a considerable amount of income annually. R. robini is the most harmful mite in saffron fields. This species causes corm rotting in soil which finally results in yield losses. To determine depth of planting and summer irrigation effects, the present study was conducted in Gonabad Agricultural and Natural Resources Station during 1999 to 2005. The study was laid out in factorial experiment based on Randomized Complete Block Design with four replications. The experiment consisted of three levels of planting depth and four levels of summer irrigation. Results showed that summer irrigation significantly increased mite population and yield 1osses. Increasing of depth resulted in the increasing of black spots on corms. The interaction of summer irrigation and depth of planting revealed that applying two irrigation resulted in maximum mite population in all depths. Higher mite populations were observed in fields with higher years of planting record. Increasing of depth resulted in the reduced of yield and summer irrigation reduced yield and maximum yield was obtained on control (without summer irrigation)
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