جستجوی مقالات مرتبط با کلیدواژه « خراسان شمالی » در نشریات گروه « زراعت »

In order to identify the plant parasitic nematodes of pulse fields in Northern Khorasan province, 41 soil and root samples were collected from rhizosphere of Pisum sp., Phaseoulus sp., Lens sp. during 2011 and 2012. The nematodes were extracted by combined sieving and centrifugal-flotation method of Jenkins (1969) and transferred to glycerin by using method of De Grisse (1969). The permanent slides were prepared and the nematodes were studied by light microscopy. In this study, 11 species from seven genera belonging to Tylenchina and Aphelenchina were identified as follows: Aphelenchus avenae, Aphelenchoides limberi, A. spicomucronatus, Ditylenchus adasi, D. tenuidens, Filenchus cylindricaudus, F. thornei, Geocenamus tenuidens, Helicotylenchus vulgaris, Pratylenchus neglectus, P. thornei. Among these species, Ditylenchus adasi is new record for nematode fauna of Iran.

To investigation existence of arbuscular mycorrhizal fungi symbiosis with cotton root, determination of root colonization percent and characterization of spore situation, 22 soil and root samples gathered from cotton fields of different areas in north Khorasan province. After root staining and extraction of spores from soil, root colonization and spore population determined, also effect of soil pH on these factors was evaluated. Results showed that all samples have arbuscular mycorrhizal symbiosis. About indices related to colonization, average of mycorrhizal frequency (%F) in different areas was between 95 to 100 percent. Average of mycorrhizal intensity index (%M) in Sankhast and Ashkhaneh areas with 59.8 and 31.9 was maximum and minimum respectively. about spore population density index maximum and minimum was in Esfarayen and Ashkhaneh with 212.9 and 137.2 spores per 35g/dried soil respectively. Correlation of measured indices with pH showed that correlation of spore population density with pH was significant (α = 0.05) and this correlation was positive.