Vahid Mohammadi; Ali Mokhtasi Bidgoli; Hassan Fazaeli
Abstract
The aim of this study was to determine the effect of harvest interval (re-growth) on quantitative and qualitative traits of Jerusalem artichoke as a promising forage plant. For this purpose, an experiment was conducted at a Research farm of Animal Science Research Institute, Karaj, Iran in 2015 and 2016. ...
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The aim of this study was to determine the effect of harvest interval (re-growth) on quantitative and qualitative traits of Jerusalem artichoke as a promising forage plant. For this purpose, an experiment was conducted at a Research farm of Animal Science Research Institute, Karaj, Iran in 2015 and 2016. The experiment was based on randomized complete block design with three replications and two observations. The treatments consisted of different times of harvesting forage intervals in each two, three and four months in the first year and each one, two, three, and four months after emergence or regrowth in the second year. Replant was not done in the second year. The highest dry weight of leaf, stem and total forage was obtained with harvest interval in each two months. The highest crop growth rate, relative growth rate and biomass duration and the highest growth rate, relative growth rate and biomass duration were observed in cut intervals of three, four and two months, respectively. In the second year, the highest amount of crude protein of total forage were observed in the cut intervals of one month. The highest amount of ADF of total forage was observed for cut intervals of four months. Generally, the best time for harvesting of forage can be taken each two months due to high yield forage (2056 g/m2), leaf to stem ratio of 0.53, crude protein of 12.50 percent, water-soluble carbohydrates of 3.89 percent, ADF of 32.98 percent and NDF of 46.05 percent of the Jerusalem artichoke.
Mohammad Ghasem Jami; Amir Ghalavand; Seyed Ali Mohammad Modares Sanavy
Abstract
To decrease the use of chemical fertilizers and improving the yield and yield components of sunflower, a field experiment was conducted at the Research Farm of Tarbiat Modares University in 2014 and 2105. Three irrigation regimes (irrigation after depleting 40, 60 and 80% of soil water at field capacity ...
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To decrease the use of chemical fertilizers and improving the yield and yield components of sunflower, a field experiment was conducted at the Research Farm of Tarbiat Modares University in 2014 and 2105. Three irrigation regimes (irrigation after depleting 40, 60 and 80% of soil water at field capacity (FC)), three soil fertility systems (100% farmyard manure (35% chicken manure + 65% sheep manure), 50% farmyard manure + 50% chemical fertilizer and 100% chemical fertilizer (urea)) and three zeolite rates (0, 5 and 10 ton ha-1) were studied in a split factorial arranged in a randomized complete block design with three replications, with irrigation regimes as the main plots, and factorial combination of the other two factors as the subplots. Over two experimental years, there were significant increases in grain yield and water use efficiency by applying either 100% farmyard manure (28.2 + 14.6 ton sheep + chicken manure ha-1, respectively) or integrated fertilizer (14.1 + 7.3 ton sheep + chicken manure ha-1, respectively plus 65 kg urea ha-1) with 5 or 10 ton zeolite ha-1 under all irrigation treatments. Based on the results, irrigation after depleting 40% of soil water at FC was revealed as a most performance of all treatment combinations. The highest oil and protein concentrations of grain were obtained with zeolite application under non-stress conditions. Chemical fertilizer application increased grain protein concentration, while organic manure increased grain oil concentration.