EFFECTS OF DIFFERENT INPUT LEVELS ON WEED SEED BANK IN WHEAT FIELDS OF MASHHAD

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KOUCHAKI ALI REZA; NASIRI MAHALATI MAHDI

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

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Journal: Iranian Journal of Field Crops Research Year:2005 | Volume:3 | Issue:1 Page(s): 89-102

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Information Journal Paper

Title

EFFECTS OF DIFFERENT INPUT LEVELS ON WEED SEED BANK IN WHEAT FIELDS OF MASHHAD

Author(s)

KOUCHAKI ALI REZA | NASIRI MAHALATI MAHDI | Issue Writer Certificate

Keywords

SEEDBANKQ2

WEEDSQ2

SPECIES DIVERSITYQ3

INPUT LEVELSQ4

Abstract

Species composition in weed seed bank was studied in low, medium and high input wheat fields. Two fields were selected for each input level based on the intensity of external inputs, e. g. chemical fertilizers, pesticides (in particular herbicides) and soil manipulation. Soil samples from 0-30 cm depth were taken systematically at 40 points in each field. Sampling was conducted in spring (early growing season) and autumn (end of growing season) and weed seeds in the soil SEEDBANK were identified using standard methods. Total numbers of 18 weed species, mainly annual broad leaves, were extracted in three INPUT LEVELS and two samplings. Shannon diversity index (H) for weed SEEDBANK was generally low (H<1) but low input system had higher SPECIES DIVERSITY compared to other INPUT LEVELS. Species similarity between two sampling was highest in the fields with the same input level. However, similarity index reduced when field with different INPUT LEVELS were compared. Size of SEEDBANK was at maximum in the lowest input but decreased with increasing INPUT LEVELS. In all INPUT LEVELS a significant linear relationship was obtained between SEEDBANK size at the start and the end of the growing season. The slope of regression line was 0.77, 0.54 and 0.47 for low, medium and high input systems, respectively. Based on these results in high input systems only 47% of initial seeds in the weed SEEDBANK were expected to regenerate by the end of growing season. It was concluded that in low input systems the life cycle of weed is completed successfully therefore, SEEDBANK would restructure by the end of growing season.However, increasing INPUT LEVELS, especially herbicides, will lead to a reduction in reproduction ability of WEEDS.

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APA: Copy

KOUCHAKI, ALI REZA, & NASIRI MAHALATI, MAHDI. (2005). EFFECTS OF DIFFERENT INPUT LEVELS ON WEED SEED BANK IN WHEAT FIELDS OF MASHHAD. IRANIAN JOURNAL OF FIELD CROPS RESEARCH, 3(1), 89-102. SID. https://sid.ir/paper/119132/en

Vancouver: Copy

KOUCHAKI ALI REZA, NASIRI MAHALATI MAHDI. EFFECTS OF DIFFERENT INPUT LEVELS ON WEED SEED BANK IN WHEAT FIELDS OF MASHHAD. IRANIAN JOURNAL OF FIELD CROPS RESEARCH[Internet]. 2005;3(1):89-102. Available from: https://sid.ir/paper/119132/en

IEEE: Copy

ALI REZA KOUCHAKI, and MAHDI NASIRI MAHALATI, “EFFECTS OF DIFFERENT INPUT LEVELS ON WEED SEED BANK IN WHEAT FIELDS OF MASHHAD,” IRANIAN JOURNAL OF FIELD CROPS RESEARCH, vol. 3, no. 1, pp. 89–102, 2005, [Online]. Available: https://sid.ir/paper/119132/en

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