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51.
S. A. AL-Thahabi J. Z. Yasin B. E. ABU-Irmaileh N. I. Haddad M. C. Saxena 《Journal of Agronomy and Crop Science》1994,172(5):333-341
Three field experiments were conducted on chickpea ( Cicer arietinum L.) and four on lentil ( Lens culinaris Med.) at different winter-sown rainfed locations in Jordan from 1988/89 to 1990/91 to study the effect of the duration of weed-free and weed-infested conditions on yields and yield components of the crops. Chickpea seed yields were reduced on average by 81 % and straw yields by 63 % when fields remained weed infested until harvest compared with weed-free conditions throughout the growing season. The corresponding lentil seed and straw yield decreases were 63 % and 55 %. As the duration of weed-free period increased and the duration of weed-infested period decreased, yields increased. However, the critical period of weed interference was between 35 and 49 days after emergence in chickpea and between 49 and 56 days after emergence in lentil, when these crops were at an advanced stage of vegetative growth. There were significant negative correlations between the weed dry weight and the seed or straw yields. The reduction in seed yields in both crops because of weed interference occurred mainly through the reduced number of pods /plant, which in turn was partly the result of reduced number of secondary branches. In chickpea, some reduction also occurred through reduced 100-seed weight. 相似文献
52.
Mohd Yasin Ina-Salwany Mohd Yusoff Sabri Mohd Zamri-Saad Abd Wahid Mohd Effendy 《Tropical animal health and production》2011,43(1):179-187
This study was carried out to determine the antibody responses and protective capacity of an inactivated recombinant vaccine
expressing the fimbrial protein of Pasteurella multocida B:2 following intranasal vaccination against hemorrhagic septicemia in goats. Goats were vaccinated intranasal with 106 CFU/mL of the recombinant vaccine (vaccinated group) and 106 CFU/mL of pET32/LIC vector without fimbrial protein (control group). All three groups were kept separated before all goats
in the three groups were challenged with 109 CFU/mL of live pathogenic P. multocida B:2. During the course of study, both serum and lung lavage fluid were collected to evaluate the antibody levels via enzyme-linked
immunosorbent assay. It was found that goats immunized with the inactivated recombinant vaccine developed a strong and significantly
(p < 0.05) higher specific IgA and IgG responses in both serum and lung lavage fluid samples compared to the control and unvaccinated
groups. Following intratracheal challenge, the rate of isolation was 17% for the vaccinated group, 67% for the control group
and 100% for the unvaccinated group. However, none of the goat from the vaccinated group had P. multocida B:2 in the liver, tonsil and heart. Therefore, the study revealed that an inactivated recombinant vaccine significantly provides
significant protection against high dose challenge and enhances the stimulation of the local and systemic immunities. 相似文献