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

To investigate the possibility of increasing the quantity and quality rice yield (var. Tarom Hashemi) by application of organic and biologic fertilizers with lower rate of chemical nitrogen fertilizer, a field experiment was carried out in a randomized complete block design with eight treatments and three replications in Amol in 2014-2015. Experimental treatments were: T1: control or no fertilizer application, T2: nitrogen fertilizer application of 46 kg.ha-1, T3: azolla compost application of 10 ton.ha-1, T4: vermicompost application of 10 ton.ha-1, T5: nitrogen fertilizer of 23 kg.ha-1 + azolla compost of 5 ton.ha-1, T6: nitrogen fertilizer of 23 kg.ha-1 + vermicompost of 5 ton.ha-1, T7: azolla compost of 5 ton.ha-1 + vermicompost of 5 ton.ha-1 and T8: nitrogen fertilizer of 12 kg.ha-1 + azolla compost of 5 ton.ha-1 + vermicompost of 5 ton.ha-1. Results showed that the percent of sterile floret per panicle increased (13.95%) by not using fertilizer. The highest panicle length (25.47 cm), number of fertile tiller per hill (18.30) and filled grain number per panicle (136.1) belonged to treatment no. T8. Treatments of T3 and T4 resulted in highest 1000-grain weight. The highest grain yield (5295 kg.ha-1) was produced by combined application of nitrogen fertilizer, azolla compost and vermicompost. This was due to the increased panicle length and yield components such as number of fertile tiller per hill and filled grain number per panicle. Amylose content decreased under the combined treatments. The optimum range of gelatinization temperature (ranging between 3 to 5) were observed only in treatments containing chemical nitrogen fertilizer. According to the results of this research, the treatment no. T8, due to reduced nitrogen chemical fertilizer application and its lower environmental impacts was considered to be the best treatment for increasing the grain yield of rice. Although, the combined application of nitrogen with any of the biologic or organic fertilizers, especially azolla, had a significant effect on improvement of seed yield.

To increase the rice yield by the interaction of herbicides and humic acid on Azolla control, an experiment was conducted in Amol, Mazandaran, in 2016 as a factorial experiment in randomized complete block design with three replications. Treatments consisted of herbicides application in five levels: 2-4-D SL72%, Bensulfuron methyl DF60% (Londax), bentazon SL48% (Bazagran), Oxadiargyl EC3% (Top Star) and control, and humic acid at three levels: 12, 6 and 0 lit/h (control, no humic acid). The results of this study showed that the simple effect of application of herbicides and humic acid on all traits was significant. Also, tillers number, panicle length, Azolla weight and rice yield were affected by the interaction of herbicides and humic acid. The lowest Azolla weight (115.33 g m-2) was obtained by the interaction of Oxadiargyl and 12 litha˗¹humic acid, and the highest grain yield (6871 Kg ha˗¹) was also observed in the same treatment.

This study was conducted to evaluate the effect of composted azolla on some growth and nutrient compositions of ornamental plants using Ficus benjamina cv. Starlight as a model plant. The trial was carried out as factorial experiment using randomized complete block design with three replications. Five levels of nutrition including: a1) Nutrient solution without composted azolla, a2-a5) without nutrient solution and with 0, 100, 250 and 400 g/pot composted azolla and four types of growing media including: tea wastage + tree bark, 1:4 v:v; tea wastage + leaf mold, 1:4 v:v; tea wastage + tree bark, 1:4 v:v; and tea wastage + leaf mold, 1:1 v:v were applied as treatments. Some important growth characteristics were measured over the 11-months of experimental period. At the end of this period, aerial parts of the plants were harvested to be analyzed for their nutrient elements composition. Results showed that the application of 100 g/pot composted azolla not only improved quality of the appearance of the plants, but also increased the macro nutrient elements accumulation in the aerial parts of plant as compared to the other treatments. It was concluded that azolla-contained growing media can be successfully substituted with some expensive conventional peat – based growing media.

The present investigation was carried out in the Department of Horticulture, College of Agriculture, Tehran University in Karaj, to study the effects of Azolla in composting of tree bark, tea wastes and rice hull and to compare the physical and chemical properties of mixes and organic matters with media standards for use on the ornamental plants. At first, Azolla ferm were mixed with tree bark, Tea wastes and rice hull as volume ratios of 0%, 25%, 75% and 100%. The mixes were sampled, during composting in 45 and 90 days, for maturity determination. The experiment was designeed in Randomized Complete Blocks, with four replications. After five months, the mixes were sampled again, and compared with control mix consisted of 50% peat and 50% perlite. At this time all physical and chemical properties were measured. Results showed that Azolla alone, did not significantly affect rice hull in composting, but in 50% and 75% ratios significantly affected composting of tree bark and tea wastes. Azolla compost was rich in nutrient elements, and tree bark compost and its mixes with Azolla had the best properties for ornamental plants media.