This study aimed to estimate the effect of spraying of okra plants, <i>Abelmoschus</i> <i>esculentus</i> (L.) with GA<sub>3</sub> on the quality and oil content of the seeds. For th...This study aimed to estimate the effect of spraying of okra plants, <i>Abelmoschus</i> <i>esculentus</i> (L.) with GA<sub>3</sub> on the quality and oil content of the seeds. For this, the local okra variety was selected and used, which was growing widespread in the coastal region of Syria. This study was carried out in Al-Haffa area, Lattakia governorate, Syria (with 105 MSL elevation) for two seasons 2019-2020. The results showed that the effect of spraying with GA<sub>3</sub> was more evident in the quality of the seeds as well as oil content at 75 ppm concentration with 68.7 g weight of 1000 seeds and 5.31% seed oil percentage. This study also showed that oil of local okra variety seed was rich in the essential fatty acids namely, linoleic, palmitic, oleic, stearic and linolenic, treatment with 75 ppm concentration of GA3 was more effective in the seed content of essential fatty acids with 42.30%, 32.55%, 9.20%, 6.73% and 5.72%, respectively. Finally, our results were indicated that treatment of okra plants at 75</span><span style="font-family:""> </span><span style="font-family:"">ppm of GA3 enhanced the quality and oil content of seeds compared to the other concentrations.展开更多
Botanical, soil chemistry and soil microbiology variables were tested as predictors of in situ soil respiration rate in the various terrestrial habitats on sub-Antarctic Marion Island (47oS, 38oE). Inorganic P and tot...Botanical, soil chemistry and soil microbiology variables were tested as predictors of in situ soil respiration rate in the various terrestrial habitats on sub-Antarctic Marion Island (47oS, 38oE). Inorganic P and total N concentration were the best predictors amongst the chemistry variables and bacteria plate count the best of the microbiology variables. However, while these chemistry and microbiology variables could accurately predict soil respiration rate for particular habitats, they proved inadequate predictors across the whole range of habitats. The best suite of predictors comprised only botanical variables (relative covers of five plant guilds) and accounted for 94% of the total across-habitat variation in soil respiration rate. Mean field soil respiration rates (2.1 - 15.5 mmol CO2 m-2 h-1) for habitats not influenced by seabirds or seals are similar to rates in comparable Northern Hemisphere tundra habitats. Seabird and seal manuring enhances soil respiration rates to values (up to 27.6 mmol CO2 m-2 h-1) higher than found at any tundra site. Glucose, N, P or N plus P were added to three habitats with contrasting soil types;a fellfield with mineral, nutrient-poor soil, a mire with organic, nutrient-poor soil and a shore-zone herbfield heavily manured by penguins and with organic, nutrient-rich soil. Glucose addition stimulated soil respiration in the fellfield and mire (especially the former) but not in the coastal herbfield soil. N and P, alone or together, did not stimulate respiration at any of the habitats, but adding glucose to fellfield soils that had previously been fortified with P or NP caused a similar increase in respiration rate, which was greater than the increase when adding glucose to soils fortified only with N. This suggests that fellfield soil respiration is limited by P rather than N, and that there is no synergism between the two nutrients. For the mire and coastal herbfield, adding glucose to soils previously fortified with N, P or NP did not enhance rates more than adding glucose to soils that had received no nutrient pre-treatment.展开更多
文摘This study aimed to estimate the effect of spraying of okra plants, <i>Abelmoschus</i> <i>esculentus</i> (L.) with GA<sub>3</sub> on the quality and oil content of the seeds. For this, the local okra variety was selected and used, which was growing widespread in the coastal region of Syria. This study was carried out in Al-Haffa area, Lattakia governorate, Syria (with 105 MSL elevation) for two seasons 2019-2020. The results showed that the effect of spraying with GA<sub>3</sub> was more evident in the quality of the seeds as well as oil content at 75 ppm concentration with 68.7 g weight of 1000 seeds and 5.31% seed oil percentage. This study also showed that oil of local okra variety seed was rich in the essential fatty acids namely, linoleic, palmitic, oleic, stearic and linolenic, treatment with 75 ppm concentration of GA3 was more effective in the seed content of essential fatty acids with 42.30%, 32.55%, 9.20%, 6.73% and 5.72%, respectively. Finally, our results were indicated that treatment of okra plants at 75</span><span style="font-family:""> </span><span style="font-family:"">ppm of GA3 enhanced the quality and oil content of seeds compared to the other concentrations.
文摘Botanical, soil chemistry and soil microbiology variables were tested as predictors of in situ soil respiration rate in the various terrestrial habitats on sub-Antarctic Marion Island (47oS, 38oE). Inorganic P and total N concentration were the best predictors amongst the chemistry variables and bacteria plate count the best of the microbiology variables. However, while these chemistry and microbiology variables could accurately predict soil respiration rate for particular habitats, they proved inadequate predictors across the whole range of habitats. The best suite of predictors comprised only botanical variables (relative covers of five plant guilds) and accounted for 94% of the total across-habitat variation in soil respiration rate. Mean field soil respiration rates (2.1 - 15.5 mmol CO2 m-2 h-1) for habitats not influenced by seabirds or seals are similar to rates in comparable Northern Hemisphere tundra habitats. Seabird and seal manuring enhances soil respiration rates to values (up to 27.6 mmol CO2 m-2 h-1) higher than found at any tundra site. Glucose, N, P or N plus P were added to three habitats with contrasting soil types;a fellfield with mineral, nutrient-poor soil, a mire with organic, nutrient-poor soil and a shore-zone herbfield heavily manured by penguins and with organic, nutrient-rich soil. Glucose addition stimulated soil respiration in the fellfield and mire (especially the former) but not in the coastal herbfield soil. N and P, alone or together, did not stimulate respiration at any of the habitats, but adding glucose to fellfield soils that had previously been fortified with P or NP caused a similar increase in respiration rate, which was greater than the increase when adding glucose to soils fortified only with N. This suggests that fellfield soil respiration is limited by P rather than N, and that there is no synergism between the two nutrients. For the mire and coastal herbfield, adding glucose to soils previously fortified with N, P or NP did not enhance rates more than adding glucose to soils that had received no nutrient pre-treatment.
