Showing 2 results for Kavosi
Mohammad Rabiee, Masoud Kavosi, Hassan Shokri Vahed, Pari Tousi Kehal,
Volume 17, Issue 64 (summer 2013)
Abstract
In order to evaluate the effect of concentration and time of foliar spraying of nitrogen fertilizer as supplemenfary to soil nutrition on grain yield and some important traits of rapeseed (Hyola401), an experiment was conducted in complete randomized block design with 16 treatments and three replications in in 2008-2009, 2009-2010 growing seasons, and in 2003-2005 growing seasons in paddy fields of Rice Research Institute of Iran (Rasht). In this experiment, nitrogen concentration (from urea source) at two levels (5 and 100.00) and application time at seven levels including 1-seedling stage: 6-8 leaves 2: beginning of stem elongation 3: prior to flowering 4: 6-8 leaves + stem elongation 5: 6-8 leaves + prior to flowering 6: stem elongation+ prior to flowering 7: 6-8 leaves + stem elongation+ prior to flowering with two control treatments including zero nitrogen fertilizer and basal fertilization as 1/3 at seed sowing, 1/3 at stem elongation and 1/3 prior to flowering stages of 180 kg pure N ha were considered. Results of combined analysis showed significant differences between the experimental treatments in most traits. Spray application of nitrogen (100.00) in stem elongation+prior to flowering stage produced maximum silique length (6.8 cm), number of secondary branch (7.1) and plant height (141.1 cm). Also, the spray application (100.00) in 6-8 leaves+stem elongation+ prior to flowering stage had maximum biological yield (10684.6 kg.ha-1), grain and oil yields (3686.2 and 1489.3 kg.ha-1, respectively) and the maturity period (202 days). Spray application (100.00) in stem elongation+ prior to flowering stage did not induce significant difference with spray application (100.00) in the three stages. Maximum oil content was observed in control treatment (zero nitrogen fertilizer) with an average of (44 %). According to the results of the present experiment, it seems that spray application of nitrogen (100.00) at final growth stage of rapeseed (stem elongation+ prior to flowering stage) increases grain and oil yields.
M. Alizadeh, F. Mirzaii, T. Sohrabi , M. Kkavosi , M. R Yazdani,
Volume 17, Issue 66 (winter 2014)
Abstract
Water management in cracked paddy soils is an important issue in rice cultivation. In order to study organic matter and zeolite effect and their interaction on moisture conditions and hydraulic and physical properties of paddy soils, the organic matter (rice straw) at four levels (0, 8, 16 and 24 tons per hectare), zeolite at four levels (0, 0.5, 1 and 1.5 percent ), and also moisture stages of soil at 5 levels were selected. This experiment was conducted in Rice Research Institute of Iran. Randomized Complete Block Design (RCBD) was used to study the effect of treatments on different subjects. The amount of moisture, bulk density and the distance of soil from the wall of container were measured in a 4-month period. The obtained results showed that the interaction effects of organic matter and zeolite on soil moisture content were statistically significant at one percentage level. Addition of plant residues caused an increase in soil moisture weight and reduction in bulk density compared to the control treatment. It was also found that soil moisture content and bulk density were highly correlated. Bulk density of control treatment ranged from 0.75 to1.7 gr/cm3, while with addition of 1.5 % crop residue the bulk density ranged from 0.7 to 1.3gr/cm3. Overall results show that crop residues are effective in reduction of crack parameters of soil , but zeolite cannot be effective although it causes more maintenance of soil moisture.
