جستجوی مقالات مرتبط با کلیدواژه « عملکرد » در نشریات گروه « توقف انتشار »

Bean cultivars with various morphological features and genetic backgrounds show different responses to weeds that eventually may decrease the yield. This research was carried out during two years (2006-2007) to assess the ability of red bean cultivars to compete with some weeds. The experiment was performed as a split plot factorial based on randomized complete block design with three replications. Main plot included two levels (with and without) of weed. Sub plots had factorial combinations of different bean cultivars (Sayyad, Derakhsan and local cultivar of Zanjan province) and various plant densities (20, 30, 40 and 50 plants per square meter). included cultivars Sayyad, Derakhshan and local cultivar of Zanjan and planting densities were 20, 30, 40 and 50 plants per square meter. The space between planting rows was 30 cm. The number of weeds and thier dry weight per plot were determined three times in: third trifoliate leaf, 50% flowering and physiological maturity stages. The biomass of bean was measured in three stages as described above. Number of pods per plant, number of grains per pod, plant height, yield and one hundred grain weight for each plot were measured. Statistical analyses were performed using SAS, SPSS and EXCEL softwares and mean comparison of data was carried out using Duncans multiple range test. Results showed that Sayyad cultivar at densit of 40, Derakhshan cultivar at densit of 50 and local cultivar at densit of 30 and 40 plants per square meter had the highest biomass, yield and impact on reduction of weeds biomass.The results also showed that 40 bean plants per in the presence of weeds produced the highest bean biomass and yield and had the highest impact on reduction of weed biomass and density.

(BPB) and soil, yield components and grain mineral nutrients, University of Tehran. e experiment was., the e-ects of nitrogen and phosphorus chemical fertilizers, cattle, combination of cattle manure and chemical fertilizer and Barvar(BPB) were investigated. e results demonstrated. Fertilizing, yield components, mucilage. e e-ect of BPB on the majority of above, while mucilage percentage was not a-ected. Cattle manure and combination of cattle manure and chemical. e highest grain yield and mucilage20P10 + 20 ton/ha cattle manure with BPB treatment. 20 ton/ha cattle.

In order to decrease negative eects of salt stress on and obtain suitable development under excess salt condition, many researches have been conducted and one of the most important suggestive methods is utilization of plant growth regulators. "e eect of 4 salinity levels (0,1, 0.5 and 2 g NaCl/ kg Soil) and 4 dierent concentrations of chlormequat chloride (0, 250, 500 and 750 ppm) on some characters of rapeseed (Hyola 401) were evaluated in greenhouse. Resultsshowed that by increasing concentration of cycocel, yield and yield components increased under salt stress. Also with increasing concentration of salt, signicant reduction in yield and yield components was observed. In this study, yield had a positive correlation with height, weight of 1000 seeds and number of pods in each branch of rapeseed Var. Hyola 401. So decreasing of height is one of the main factors aecting dry matter accumulation. In this research, there was negative correlation between yield and number of pods in main branchs, because increasing number of branchs increased yield and decreased number of pods in main branch. It can be concluded that, higher yield in Hyola 401 can be obtained with the use of 500 and 750 ppm of cycocel under salinity condition.

In order to assess the impact of type and rate of organic wastes and urea, on potato yield a field trial experiment was conducted in Zanjan Agricultureal Recerch Station. The study design was split - plot that kind organic wastes considered as main plots and factorial combinations of three rates of urea (0, 90 and 180 kg N ha-1) with three rates of organic waste (0, 10, 20 Mg ha-1) as sub-plots. The organic wastes used in the study were poultry manure, wheat straw and a mixture of them(1:1 ratio).Total 108 plots were used for study (27 treatment * 4 replications). Potato tubers were planted in May 2005 and during full bloom the height of plant was measured and leaf samples were taken for chemical analyses. The potato yield was highest in poultry manureammenedplots. The application of poultry manure cased to 30 % increase of the tuber yield of potato compare to control. The results indicated that with increasing the application rate of organic wastes and urea the yield of potato tubers improved. Applying urea in combination with organic wastes yielded more potato tuber than when these material added alone. The effects of types and rates of organic wastes urea-N rates and their interaction effects were significant on size distribution of potato tubers dry matter content of tubers plant height and N, Fe, Zn and Mn concentrations of leaf. The kind of organic wastes not significantly affects K and P Concentration of leaf, however, the rate of urea and organic wastes and their interaction had significantly effect on K and P concentrations of leaf. The rates effects of organic wastes were also significant on concentrations of microelements in leaf and the highest concentrations of these elements were obtained when the highest rates of organic wastes were applied.

Garlic (Allium sativum L.) is a nutritious and pharmacological vegetable that has received considerable attention in recent years. To study the combined effects of sulfur and inoculation with thiobacillus on chemical composition and onion yield of garlic bulb, an experiment with three rates of sulfur (0, 6 and 12 Mg ha-1) was conducted in a loamy soil (coarse loamy mixed typic xerofluents) at Dr Nakhjavani Agricultural research station in 2005. The results of analysis of variance of data showed that the application of sulfur increased onion yield of garlic but this yield increase was not statistically significant. However, the concentration of zinc in garlic onion increased and that of iron decreased significantly as a result of sulfur application. The addition of sulfur to soil also increased the concentration of copper in the garlic onion but the concentrations of phosphorus and manganese was not affected by the sulfur application.

An experiment was conducted to evaluate the effects of poultry by-product meal (PBPM) as the replacement of soybean meal (SBM) in the diets of broiler chickens on growth performance. 360 male Arbor Acers day old broiler chicks with 45 g initial body weight were selected and divided to six dietary treatments. Each treatment involved 5 replicates of 12 chickens. Experimental diets were formulated to be isocaloric and isonitrogenous. The diets involved the levels of 0, 3, 6, 9, 12 and 15 percent of poultry by-product meal. Chickens were fed the experimental diets from 21 to 49 days of age. Experimental design was a completely randomized design. Measured traits, in this study, included live body weight, daily weight gain, feed consumption, feed efficiency, percentage of Tibia ash, weight of different body organs and their ratio to live body weight and feed cost per 1 kg weight gain up to 42 and 49 days of age. Results of the present study showed that the use of poultry by-product meal up to 6 percent had a positive effect on weight gain and feed to gain ratio in 42 and 49 days of age. No significant effect was observed for Tibia ash percentage (P > 0,05). Differences for live body weight, feed intake, feed to gain ratio and feed cost per 1 kg of live body weight were significant (P < 0,05). Birds fed 6 percent poultry by-product meal had maximum weight gain, yield and better feed

Twenty four multiparous Holstein cows in early lactation were used in randomized complete block design to evaluate the effect of different levels of cottonseed meal and soybean meal on performance of lactating dairy cow in early lactation. One of the following sources of supplemental crude protein was included in each treatment diets: 1) cottonseed meal 2) cottonseed meal plus soybean meal 3) soybean meal. Levels of cottonseed meal and soybean meal in experimental diets were (36, 18, 0) and (0, 6. 75, 13,5) respectively. The experimental diets were formulated to contain 18,5% crude protein and 1,64(Mcal/Kg) net energy for lactation on the dry matter basis. Cows were fed with total mixed ration grouply. Dry matter intake and milk and fat corrected milk yeild were not affected significantly by experimental diets. Milk composition components percentages and milk composition components yields were not affected significantly by experimental diets. Although there was no significant effect on crude milk production in our study, there was a different (p <0,05) in milk production efficiency. Rumen pH and fecal pH were not affected significally by experimental diets. Dry matter intake, organic matter, crude protein, ether extract, neutral detergent fiber and non fiber carbohydrate digestibilites were not affected significahtly among diets. Daily weight gain and body condition score change were not affected significantly among diets. Measurement of plasma gossypol indicated that diets had significant effect, so that highest plasma gossypol was in cows consuming first diets (p <0,05). plasma calcium and albomine and total protein (mg/dl) were affected significantly among diets (p <0,05). Cows fed first diet spent more time eating, ruminating and total chewing time per Kilogram of total forage neutral detergent fiber than cows fed other diets.