Yazar "Ullah, Muhammad Saif" seçeneğine göre listele

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    PHYSIOLOGICAL RESPONSE OF TOMATO PLANTS UNDER DIFFERENT IRRIGATION LEVELS AND NUTRIENT CONCENTRATIONS IN GREENHOUSE
    (Univ Agriculture, Fac Veterinary Science, 2020) Ullah, Ikram; Mao Hanping; Shabbir, Abdul; Ullah, Muhammad Saif; Jabran, Khawar; Javed, Qaiser; Buttar, Noman Ali
    This study assessed the response of various water levels and concentration of nutrients on physiological characteristics of tomatoes under the greenhouse. The effects of various water levels as well as concentration of nutrients on the physiological characteristics of greenhouse tomatoes were discussed. Treatments consisted on five different levels of water based on crop evapotranspiration (ETC) as W-50%, W-75%, W-100%, W-125% and W-150%, and also five different levels of nutrient concentrations based on strength of Hoagland solution (X) as N-0.5X, N-0.75X, N-1.0X, N-1.5X and N-2.0X. The experiment was conducted during the Summer-Spring (SS) of 2015 and Fall-Winter (FW) of 2015-16. Deficit irrigation not only decreased photosynthetic rate (P-n), stomatal conductance (G(s)), and transpiration rate (T-r) of tomato but also down regulated the light-saturated net photosynthetic rate (P-n,P-max) from 6.18% to 11.38% and c indicating light use efficiency by 5.08% to 6.0% during SS and FW respectively. Increase in nutrients, enhanced the daily mean P. values up to 21.80 and 14.94 mu mol (CO2) m(2) s(-1) at N-1.5X during SS and FW, respectively. Addition of nutrients more than 1.5X did not significantly improve the photosynthetic performance. No significant difference was observed in P-n on 42nd DAT for T-6(W-125%-Ni-1.0X) and CR(W-100%-N-1.0X) but reduced significantly at subsequent measured days for CR. Considering only leaf gas exchange parameters, CR was found to be the optimal combination of water amount and nutrients concentration. Finally, interactive quadratic regression models were developed for P-n,P-max and epsilon to measure the water and nutrients needs from instantaneous values of P-n,P-max and epsilon. Our developed regression equations could be solved for momentarily estimation of water and nutrients.
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    Under Biological Invasion: Impacts of Litter Decomposition Mediated by Invasive Plant Species on Soil Nutrients and Functional Growth Traits of both Invasive and Native Plant Species
    (Pleiades Publishing Inc, 2024) Ullah, Muhammad Saif; Farooque, Aitazaz A.; Javed, Qaiser; Ullah, Ikram; Bo, Yanwen; Jabran, Khawar; Sun, Jianfan
    An invasive plant, Solidago canadensis is quickly encroaching across Eastern China and has become a crucial concern in the alteration of native ecosystem structure and function. However, the impact on invaded soil from S. canadensis litter is still under consideration. This study evaluated the effects of different levels of litter mass (Control: L0, 5 g: L5, 10 g: L10, 15 g: L15, and 20 g: L20) of invasive S. canadensis on the functional traits of two congeneric plant species (S. canadensis and S. decurrens), as well as resulting variations in soil nutrient levels. Our results indicated that shoot and root length, fresh and dry biomass, leaf chlorophyll and leaf nitrogen were significantly higher at L15 compared to the other treatments in the experiment. Additionally, in the L20 treatment all traits were decreased drastically, although these were higher than the control treatment, i.e. L0. Soil nutrients increased as the level of litter mass was raised in the soil. Furthermore, our study showed that high litter mass from S. canadensis can adversely impact the functional traits of both plant species. Further studies are required to assess the allelopathic effect of litter mass, as well as biological and physicochemical properties of field soil where high quantities of the invasive plant litter are found.