comparison of aphis fabae performance on bean plant under different fertilization regimes of n/k
نویسندگان
چکیده
host plant's quality in the food chain of a herbivorous insect influences the insect's life performance, and thus abundance in its population. the effect of different ratios of n: k fertilization (40:60), (40:40), (40:0) kg/ha vs. control (0:0) were determined on chemical content parameters (n, k and c %) of the bean plant and as well on the performance of aphis fabae scop. experiments were carried out in a greenhouse with 25±1?c, 75±5 rh and a photoperiodism cycle of 16 l: 8d hours. the highest percentages in plants tissue of n and k were found in plants fertilized with 40: 0 and 40: 60 (n: k) ratios respectively. net reproductive rate (r0) of a. fabae fed on the mentioned treatments were determined as 14.75±2.4, 20.27±1.38, 22.07±2.2 and 17±3.1 female/female/generation, respectively. intrinsic rate of increase (rm) of a. fabae on the four treatments were assessed as 0.215±0.017, 0.325±0.02, 0.295±0.014 and 0.258±0.017, respectively. finite rates of increase (?) amounted to 1.32±0.001, 1.41±0.03, 1.38±0.01 and 1.32±0.001, respectively showing the daily rate of increase in aphid female population relative to that during the previous year. mean generation times (t) in the four treats were 12.51±0.17, 9.32±0.17, 10.48±0.16 and 10.19±0.14 days. the results showed that there existed significant differences between r0, rm and ? of a. fabae different treatments (p
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عنوان ژورنال:
دانش گیاه پزشکی ایرانجلد ۴۲، شماره ۱، صفحات ۴۳-۴۹
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