جستجوی مقالات مرتبط با کلیدواژه "برداشت" در نشریات گروه "زراعت"

A field experiment was carried out to investigate the effects of transplanting and sowing date on the yield and some quantitative traits of cotton, Khordad cultivar, in Orzouieh- Kerman subtropical climate during 2017 and 2018. Experiments were conducted as the split-plot in time based on randomized complete block design with three replications. Treatments were included: A) Planting date in three levels:1- May 22, 2- June 10 and 3- July 1 as the main plot, B) Method of cultivation in three levels: 1- single transplant cultivation, 2- double transplant cultivation, and 3- seed cultivation as the subplot, C) harvest time in three levels: 1- first harvest (October 23) 2- second harvest (November 6) and 3- third harvest (November 21) as the sub-sub plot. Results showed that double transplant cultivation at the first planting date of May 21 compared to direct seed planting at this planting date improved quantitative traits including several bolls (49.4%), lint yield (78.6%), seed cotton yield (72%), fiber yield (107%), plant height (35.3%) and water use efficiency (89%) in the first harvest. The single transplant was the second rank. For the next two planting dates, the same results were observed. Results indicated that double transplant cultivation is better than direct seed cultivation at the late planting date in the Orzouieh zone.

The cotton picker harvesting machines are expose to the limitations as follows: Inappropriate space between the planting rows harvester head, utilizing the deciduous before harvesting; high prices, being of imported cotton harvesting machine and exit the currency of the country; the small size of the most farms and the cultivation of non-linear and non-acceptance negligible loss machinery by the farmers. Therefore, it is necessary to design and developed a cotton-harvesting machine that it can apply under the afore-mentioned limitations. For this purpose, a self-portable machine with three-wheel designed. It has a special harvester unit. Picker unit have made with the number of bars such as the finger. It can rotate by an electrical motor. This unit moves by the worker between the bushes and pick the cottons. Cottons can be picked by harvester unit and then transmit them to the reservoir via transmission tubes, with the two mechanisms, suction and blow. The gathered cottons inside the big gunnydischarge at the end of the farm. The objective of this study was design, construction and evaluation of a semimechanized cotton picker-harvesting machine. In the evaluation of this machine, compared to the traditional cotton harvesting (manually). This machine designed first by the SOLIDWORKS software, and then made. To evaluate of this machine and its comparison with the manual method, the two varieties of cotton, Golestan and Khorshid harvested in four rows at the length of 36 m, with three replications. The evaluated properties were field capacity, field losses, impurityamount and fiber length. The experimental design carried out based on the randomized complete block design with the two factors, harvesting method at the two levels (manually as control and semi-mechanized machine) and variety at the levels, Golestan and Khorshid. The test results and evaluate showed that the field capacity of cotton harvesting of this machine was 18/7% more than the handpicked. Moreover; the fiber quality not only does not reduce, but also in some cases, such as the fiber length increased and showed significantly at 5%level with this machine, when compared to manual harvesting method. Increase at about 3 percent in purity and significant increase in the fiber length at 5 percent level was the other result of this machine.

In this study 34 forage sorghum pure line varieties which improved in sorghum breeding program in Iran, were conducted to determine of the most suitable variety, on a randomized complete block design (RCBD) in three replications at Karaj, in 2005. Ammonium phosphate on the base of P2O5 was applied at 115 Kg/ha. and total nitrogen was used 183 Kg/ha. at four times. Four traits including green fodder, dry matter, plant height and tiller number were measured in each cutting. Harvesting was conducted from 8.4 m2 area. Data were analyzed in split plot on time based on RCBD and the means comparised with Duncan multi rang test (DMRT) method, analysis of variance showed significant differences between cuttings, varieties and cutting * variety interaction at 1% of probability. Comparison of the means by DMRT showed that KFS3 and KFS6 were produced the highest and lowest green fodder with 179.56 and 83.54 t/ha. respectively. In aspect of dry matter KFS18 and KFS6 were produced the highest and lowest dry matter with 39.84 and 20.02 t/ha. Respectively. The 84/1384 produced the highest plant height, 271.7 cm and KFS14 the lowest plant height, 129.7 cm at second cutting. 144/1384 was produced the highest tiller number per plant with 6.33 tiller at second cutting and KFS14 was produced the lowest tiller number with 1.00 tiller at first cutting. According to all traits especially main traits to forage production, totally 15 varieties were chosen for investigation of regional adaptation of new forage sorghum varieties at different conditions.

Harvesting of sour cherries is very difficult task which is done either by machine or hand. In order to facilitate fruits harvesting ethephone with different densities is used. In this research work Iranian produced ethephone with density of 1.18 g/cm3 and England produced ethephone with density of 1.45 g/cm3 was utilized with different concentration (0, 150, 225 and 300) in a 2×4 factorial experiment for types and concentrations of ethephone on fruit detachment force from pedicle, fruit abscission percentage and some of fruits quantitative as well as qualitative properties. Type of ethephone hormone only has significantly affected properties such as fruits weight, fruit detachment force from pedicle, abscission fruit percentage and soluble solid content (°Brix) while did not have significant effect on average 1000 pit weight flesh/pit ratio, fruit diameter, fruit firmness, pH, titratable acidity, suger/acid ratio and color characteristics. The increasing concentration of ethephon decreased fruit detachment force from pedicle, firmness and titrateable acidity and increased brix°, fruit weight and fruit abscission percentage.

A study was conducted on six years old trees of almond, Shahroud cv. (No. 18), in a three-year trial (2002-04) at Mashhad Agricultural Research Station. The experiment was done on the basis of completely randomized desigh with four replications. In the first and second years of the experiment, ethephon was sprayed in 15 and 20 days before the common time of harvesting, respectively. The concentrations of ethephon in 2002 were variable between zero to 600 mg/l; whereas in 2003, they were 0 upto 900 mg/l. Through 2003 and 2004, ethephon spraying (900 mg/l) was carried out in mid fall every year, too. A Khorasanina cultivar (named as No. 1) was also considered for fall treatment. In each year, the percentage of fruits with dehiscent hull increased by higher concentrations of ethephon, significantly. The force (gravitometer figures) over which fruits have been detached from branches decreased significantly by higher concentrations of ethephon. We concluded that, the concentration of ethephon should at least be 500-600 mg/l so that the required results in ripening of almond fruits can be obtained. In order to delay the flowering time, ethephan spraying (900 mg/l) was the most effective treatment, in mid fall, considerably. In the case of summer treatments trees showed gummosis, mostley.