جستجوی مقالات مرتبط با کلیدواژه "کارایی آب آبیاری" در نشریات گروه "کشاورزی"

Since the yield of sugar beet is affected by the length of the growing period and agronomic management, to investigate the delayed cultivation, this experiment was conducted in 2015 and 2016 with two treatments of planting row spacing (Pr) with two levels of 25 and 40 cm (main plot) and three levels of plant spacing on row (Ps) using 1.7, 2.4, and 3.1 units per hectare seeds (sub-plot), it was carried out in the form of split plots with a RCBD in four replications. By adding the harvest date treatment with two levels of conventional and delayed in the second year, the statistical design was changed to split plots factorial (Ps and harvest date as factorial). The highest percentage of white sugar content (WSC) and potassium was obtained in the 40 cm row spacing. In the second year, a 37% decrease in the number of final roots compared to the first year caused a 25% decrease in root yield (RY), 31% in white sugar yield (WSY), and 21% in irrigation water use efficiency (IWUE). Contrary to the first year, the effect of Ps was not significant on traits such as RY, WSY, and IWUE, while it had no significant effect on the percentage of WSC in any of the two years. In the second year, with a delay in harvesting, the increase in WSY and IWUE was 32% and 16%, respectively. Therefore, Pr of 25 cm and Ps of 22 cm (2.4 units) is recommended for the Karaj region.

In order to study the effects of irrigation water salinity on the yield and yield components of three commercial sunflower hybrids, this experiment was carried out in a randomized complete block design and three replications in Rodasht Agricultural Research Station during three years. The main factors of irrigation water quality were at 4 levels i. e. 2, 5, 8, and 11 dS m-1 and the sub main factors were sunflower hybrids Allstar, Haysan 33, and Azargol. Statistical analysis results showed that salinity and high concentration of some minerals, especially sodium ions, in irrigation water affected the diameter, total oil yieldو and water use efficiency was significant at 1% level, while the effects on plant height, stem diameter, seed weight, grain yield, water use, and oil percent was significant at 5% level. Statistical analysis showed that the effects of hybrids on the diameter, oil yield, plant height, stem diameter, weight of 100 seeds, and water use efficiency were significant at the 1% level, and on yield at 5% level. In terms of performance, hybrids Haysan 33, Azargol, and Allstar had, respectively, the highest seed yield, oil yield, and water use efficiency.