جستجوی مقالات مرتبط با کلیدواژه "root development" در نشریات گروه "آب و خاک"

Due to the limited water resources of the country, optimizing irrigation systems in a way that can improve evaporation losses and transpiration management is one of the important factors in increasing water productivity. Therefore, this study was conducted to investigate and compare Technical and economical comparison of sprinkler and subsurface drip irrigation system of alfalfa during three years (2019-2021) in Ekbatan station of Agriculture and Natural Resources Research and Education Center of Hamedan Province. The treatments included subsurface drip irrigation without trifluralin injection (T1), subsurface irrigation with trifluralin injection at a rate of 4 liters per hectare (T2), subsurface irrigation with trifluralin injection at a rate of 6 liters per hectare (T3), irrigation with nan Drin pipes (T4) and a sprinkler treatment (control). The statistical format of the project was randomized complete blocks with 3 replications. The results of this study showed a significant effect of different treatments on yield and water productivity (p≤1%). T3 treatment with the highest yield and water productivity, at 20873 kg. ha-1 and 2.46 kg.m-3, respectively, was preferable to the other treatments. The average 3-year yield of alfalfa crop in two systems of drip and sprinkler irrigation systems was 19779 and 14751, kg. ha-1 respectively, and water productivity was 2.4 and 1.3 kg.m-3, respectively. The average volume of applied water in the subsurface and sprinkler drip irrigation system was 8472 and 11480 m3.ha-1, respectively. Therefore, it can be said that the subsurface drip irrigation system, in addition to increasing yield, has reduced water consumption by 26.2% and improved water productivity by 84.6%. Also, no traces of root accumulation around the drippers were observed. An increase in salinity in the depth of the farm soil was observed at the end of irrigation in two irrigation systems, which decreased with the rainfalls that occurred throughout the year.

Irrigation management is one of the most important factors affecting the development and expansion of the plant root. The aim of this study was to investigate the effect of different deficit irrigation treatments on the root characteristics of fodder maize (KSC 704) in surface drip irrigation system. This research was conducted in agricultural research center of Khorasan Razavi during the 2014 growing season. A factorial experiment based on randomized complete blocks design with nine treatments and four replications was carried out. Treatments included full irrigation (FI), deficit irrigation (DI) and replacements of 80 and 60% of total water requirement, partial root zone drying (PRD) at 100, 80 and 60% of water requirement and fixed partial root zone drying (FPRD) at 100, 80 and 60% of water requirement. Water requirement was determined based on compensation of soil moisture deficit using an electromagnetic moisture meter. Water was measured by volume meters and distributed in the field. The first stress was applied at the 6-leaf stage of maize. Two weeks after applying the first deficit irrigation treatment in the 10-leaf stage of the plants, the first root sampling performed. Dry weight and volume, lateral and deep penetration of roots were measured at each sampling. The results showed that in all treatments the average amount of all measured traits decreased with decreasing water consumption. There was no significant difference among root dry weight of FI, PRD100 and PRD80 treatments. Root volume was affected by water stress but application of PRD80 method prevented the negative effects of water stress on root volume. Therefore, PRD method is more efficient compared to DI and FPRD methods when applied water stress, and water and nutrients will be absorbed at a higher level by root.

Irrigation management is one of the important factors influencing the development and distribution of plant roots, which is considered by many researchers. The purpose of this study was to study the growth and distribution of corn root in various irrigation management systems. This research was carried out as a split plot in a randomized complete block design at Kabootarabad Research Station in Isfahan. The main factor was consisted of three levels of irrigation regime I1 (100%), I2 (80%), I3 (60%) and the sub-factor was included three irrigation methods, conventional, alternative and fixed furrow irrigation. The measured parameters of root were length, surface, volume, fresh and dry weight, which were carried out in 5 stages of plant growth including 9-leaf, 14-leaf, inflorescence emergence, milking and physiological examination. The results showed that the effect of irrigation regimes and the type of irrigation method on root traits was statistically significant at 5% level. The highest amount of root traits was corresponded to I1 regime and conventional furrow irrigation, and the lowest one was corresponded to I3 regime and fixed furrow irrigation. The highest amount of root traits was obtained in the soil layer of 0-20 cm for all regimes and irrigation methods. From the 9-leaf to the milky stage, the root traits had a bullish trend, then after constant and at the end of growing season declined. Generally, a suitable root system for absorption of water and nutrients required by the plant can be achieved by application of a deficit irrigation rate up to 20% in conventional furrow irrigation or alternative furrow irrigation, which leads to save water consumption.

In order to investigation the root distribution and plant growth of Rosmarinus Officinalis L., an experiment was conducted in a completely randomized design with three replications under using subsurface irrigation system in 2016. In this study treatments are full irrigation (FI), regulated deficit (RDI75 and RDI55) and partial root zone drying irrigation (PRD75 and PRD55). The results showed that deficit irrigation at 75 and 55 percent of full irrigation resulted in saving 17.1 and 32.6 percent water consumption respectively. Comparison of FI and PRD75 showed that dry weight, height of plants and number of shoots per plant decreased 5.3, 9.8 and 8.9 percent respectively. However, proper development of root in PRD75 increased 12.8 percent of water productivity, 7.3 percent of root fresh weight, 2.7 percent of root depth and 10.7 percent of root volume. Therefore, considering the problems of water scarcity, it is possible to provide PRD75 as a superior treatment and a suitable strategy to cope with the water crisis, to move towards a sustainable agricultural system.