Papers by Ruhollah Naderi
Weed Technology, Jul 11, 2022
A 2-yr field experiment was conducted to explore the effects on weed growth and crop productivity... more A 2-yr field experiment was conducted to explore the effects on weed growth and crop productivity of intercropping sweet corn with summer savory. Five cropping patterns were set up: sweet corn alone (16 seeds m−2, in rows, 75 cm apart), summer savory alone (40 seeds m−2, broadcasted), and three intercropping ratios of 75% sweet corn, 25% summer savory (75%C:25%S), 50%C:50%S, and 25%C:75%S, of plant densities used in respective monocultures. When intercropping, weed biomass decreased as the proportion of summer savory increased, with a reduction of 48%, 61%, and 70 % in 75%C:25%S, 50%C:50%S, and 25%C:75%S, respectively, compared to sweet corn alone. In parallel, sweet corn yield was higher under intercropping compared to its monoculture and increased as the proportion of summer savory decreased, with yield increases compared to corn monoculture of 38%, 32%, and 15% in the first year and 48%, 23%, and 14 % in the second year in 75%C:25%S, 50%C:50%S, and 25%C:75%S, respectively. However, the intercropping pattern had the opposite effect on summer savory yield, with a significant reduction in yield with an increasing ratio of sweet corn. Our results indicate that intercropping sweet corn with summer savory can increase both weed suppression and yield of sweet corn compared to crop monoculture.
PeerJ
A 2-year field experiment evaluated the effects of sweet corn-summer savory intercropping on crop... more A 2-year field experiment evaluated the effects of sweet corn-summer savory intercropping on crop productivity and essential oil (EO) composition of summer savory. Five cropping patterns of Corn 100%:Savory 0%, C75:S25, C50:S50, C25:S75, and C0:S100 were tested. The highest corn yield (2,440 kg ha−1) was obtained in a corn monoculture, but was not significantly different from C75:S25 or C50:S50. However, in both years the highest savory yield was obtained in S100 (793.3 g m−2 and 816.6 g m−2, respectively). Savory yields decreased as the proportion of corn increased. The land equivalent ratios in C25:S75, C50:S50, and C75:S25 were 1.54 ± 0.07, 1.56 ± 0.03, and 1.35 ± 0.1, respectively. Monocropped savory had the highest EO value followed by C25:S75 and C50:C50. However, no significant differences were found among these three treatments. Gas chromatography-mass spectrometry (GC–MS) analysis showed that the major components were carvacrol (35.88%–42.96%), γ-terpinene (18.45%–20.03%), ...
Experimental and Applied Acarology
Camelthorn, Alhagi maurorum Medik. (Fabaceae, Leguminosae), a native component of the Asian flora... more Camelthorn, Alhagi maurorum Medik. (Fabaceae, Leguminosae), a native component of the Asian flora, is invasive in Australia, South Africa and the USA where it is considered a noxious weed in several states. To date there is no biological control program against this weed; however, initial investigations into potential biocontrol agents revealed an eriophyid mite, Aceria alhagi Vidović & Kamali, causing considerable damage in the native range. The mite attacks the growing tips as well as the flowers of the plants, not only reducing height and plant vigor but also reducing seed set. To assess the host range and impact of this potential biological control agent, on the target weed, no-choice tests as well as an open-field impact experiment were conducted at the research farm of the School of Agriculture, Shiraz University, Shiraz, Iran, over 2 years (2018 and 2019). Results from the no-choice tests suggest that A. alhagi poses negligible risk to the non-target plants tested in this study. In the first year of the open field impact test, plants did not flower; however, plant height was significantly reduced by mite attack. In the second year, significant reductions in plant biomass (26%), seed production (95%) and photosynthesis (53%) were observed in response to mite attack that would potentially limit the competitiveness of camelthorn as well as long-distance dispersal through seed in the invaded range. These results suggest that A. alhagi is a promising candidate for the biological control of camelthorn and should be prioritized for any future studies, expanding on the host range testing and safety.
Communications in Soil Science and Plant Analysis, 2021
ABSTRACT A 2-year study evaluated the effects of chemical nitrogen fertilizer and organic fertili... more ABSTRACT A 2-year study evaluated the effects of chemical nitrogen fertilizer and organic fertilizer under conventional and reduced tillage. Tillage systems were subplots, and composted cattle manure (25 tons ha−1, CCM), nitrogen fertilizer (N; 40 kg N ha−1), CCM+N (12.5 tons CCM+20 kg N ha−1), and no urea N or manure added control (CONT) were sub-subplots. Highest yield, 1000-seed weight, fruit length, and plant height occurred in CCM+N, but were not significantly different from those using just N. Increase in yield for CCM, CCM+N, and N treated plots compared to CONT were 28%, 46%, and 40%, respectively. Plots treated with CCM or CCM+N contained greater soil organic carbon (SOC) than plots treated with N or CONT. SOC was significantly higher in reduced tillage compared with conventional tillage. Highest total soil nitrogen and seed N content were observed in plots receiving CCM+N, followed by N, and CCM. The combined application of 12.5 ton CCM and 20 kg N ha−1 N fertilizer produced acceptable yields while reducing environmental impact. Reduced tillage did not affect yield, but positively affected SOC. Thus, both systems have potential as alternative strategies because both can improve the highly diminished soils of southern Iran.
Australian Journal of Crop Science, 2014
Recently, public concern has been raised about potential environmental pollution caused by excess... more Recently, public concern has been raised about potential environmental pollution caused by excessive use of chemical fertilizers. A greenhouse experiment was conducted to evaluate the effects of municipal waste compost (MWC), vermicompost (VC), cow manure (CM), sheep manure (SM) and nitrogen (N) on the growth and chemical composition of safflower in view as substitutes of fertilizers. Seed yield, plant height, N, Fe2+, Mn2+, Zn2+, and Cu2+ content in plant were measured after plant maturity. Plants grown in sheep manure gained more height (59.25+/-3 cm) than those grown in the other treatments. Padideh cultivar had significantly higher height (54.1+/-4 cm) than that of Goldasht cultivar (25.5+/-3 cm). Plants grown in N treated pots produced the greatest seed yield (1.71+/-0.05 g plant-1) which was not significantly different from those grown in SM pots (1.67+/-0.03 g plant-1). Additionally, MWC treated pots gained greater seed yield (1.51+/-0.03 g plant-1) than those treated with VC...
Journal of Biological and Environmental Sciences, 2015
A Two-year field experiment was carried out in 2009 and 2010 at Agricultural College of Shiraz Un... more A Two-year field experiment was carried out in 2009 and 2010 at Agricultural College of Shiraz University, Iran to evaluate the effects of different water stress and plant within row spacing on safflower yield and photosynthetic characteristics in weedy conditions. Results showed that drought stress at 75 % FC (field capacity) caused a reduction of 15 % in seed yield but this treatment had no significant difference with well watered. Yield reduction of 31 % was also observed at 50 % FC. The greatest seed yield was also found at plant within row spacing of 5 cm (302.6 ±23 kg m -2 ). The yield reduction caused by weed competition was 57%. Compared to well water, at 75 % FC and 50 % FC Photosynthesis rate of safflower reduced 26.18 and 65.49 %, respectively. Weeds competition reduced safflower photosynthesis rate significantly about 25 %. Transpiration in weedy plots was also significantly lower than that of weed free plots (33%). Compared to well-watered, water stress at 75 % and 50 %...
Australian Journal of Crop Science, 2014
Data mining methods are useful tools for crop physiologists to search through large datasets seek... more Data mining methods are useful tools for crop physiologists to search through large datasets seeking patterns for agronomic factors, and that may assist the selection of the most important features for the individual site and field. To find the main features contributing to barley grain yield (output), supervised and unsupervised algorithms as feature selection and attribute weighting were performed using SPSS Clementine 11.1 and Rapid Miner 5.0.001 softwares, respectively. Data presented in this study was collected from the literatures on the subject of barley physiology in Iran that was existed in http://sid.ir website. A total of 10563 data was extracted from the literatures, including 21 features and 503 records. Ranking of features by feature selection indicated that from 20 features as input, 10 features including culture type, location, irrigation regime, biological yield, nitrogen applied to the soil, rainfall amount, and genotype, with a value of 1.0 were the most important...
Salinity is one of the major abiotic challenges influencing plant productivity worldwide. To exam... more Salinity is one of the major abiotic challenges influencing plant productivity worldwide. To examine the response of two alfalfa cultivars (Bami and Hamedani) to six levels of water salinity (0, 25, 50, 75, 100, 125 mM L-1 NaCl), a glasshouse experiment was conducted at the College of Agriculture, Shiraz University, Shiraz, Iran in 2008. The results showed that in Bami (which appeared to be more tolerant to salinity), with increasing salt stress from 75 to 125 mM L-1, dry weight per pot was significantly decreased from 15.1 to 10.3 g, while in Hamedani decrease in dry weight was started from 50 mM L-1 salinity level. In both Bami and Hamedani cultivars leaf area per pot was significantly decreased when salt stress was higher than 75 mM L-1. There was a significant difference in leaf relative water content (RWC) between the two alfalfa cultivars in 75, 100 and 125 mM L-1 NaCl salinity levels. With increase in salinity level, the Na+ concentration was increased from 220 to 565 mmol ...
Journal of Plant Process and Function, 2018
Desert, 2009
Salt stress is one of the most chalanging abiotic stresses affecting natural productivity and cau... more Salt stress is one of the most chalanging abiotic stresses affecting natural productivity and causing significant croplosses worldwide. A greenhouse experiment was conducted to evaluate the response of two alfalfa cultivars (Bamiand Hamedani) to 6 levels of salinity (0 as control, 25, 50, 75, 100, 125 mM NaCl) at the College of Agriculture,Shiraz University, Shiraz, Iran in 2008. Plant dry weight per pot in both cultivars decreased with increasing salinitylevels. However, Bami as compared to Hamedani, with the lowest Na+ sequestration, produced the greater dry matterweight. Leaf area per pot was significantly affected by salt stress with Bami cultivar showing a higher leaf area thanHamedani. Na+ accumulation also increased by increase in the salinity level in either one of the cultivars; however,Na+ sequestration of Bami as compared to Hamedani, was lower due to Na+ exclusion mechanisms occurring in thiscultivar. Although Cl- accumulation increased with increasing salinity level in ...
Australian Journal of Crop Science, 2014
To evaluate the drought tolerance of four rapeseed cultivars using drought indices, a greenhouse ... more To evaluate the drought tolerance of four rapeseed cultivars using drought indices, a greenhouse experiment was conducted. Treatments consisted of four rapeseed cultivars (Hayola 401, Hayola 308, RGS and Option) and two water regimes: stress (50 % field capacity (FC)) and non-stress (well watered). Seven drought indices including stress susceptibility index (SSI), stress tolerance index (STI), tolerance (TOL), mean productivity (MP), harmonic mean (HARM), geometric mean productivity (GMP), and yield loss ratio (S) were calculated based on rapeseed yield under drought-stress and non-stress conditions. Significant positive correlations were found among rapeseed yield and several drought indices such as STI 'GMP 'MP and HARM under both stress and non-stress conditions, revealing these indices were fit to identify the drought tolerance of rapeseed cultivars. Biplot graph and correlation of the above indices also showed that Hayola 408 and Hayola 308 were superior to other cultiv...
Journal of Plant Process and Function, 2018
Journal of Plant Nutrition, 2020
Environmental Science and Pollution Research, 2020
Journal of Water and Soil Science, Aug 1, 2017
Journal of Plant Nutrition, 2019
Journal of Plant Nutrition, 2019
Journal of Plant Nutrition, 2017
Journal of Plant Nutrition, 2017
ABSTRACT The competitive effects of wild mustard on rapeseed with organic amendments and urea alo... more ABSTRACT The competitive effects of wild mustard on rapeseed with organic amendments and urea alone or combined were studied for 2 years. Treatments consisted of three Sinapis arvensis densities and fertilizer treatments of composted cattle manure, composted municipal waste, urea nitrogen, a combination CCM+urea, a combination of CMW+urea, and a control. Weed growth was stronger in urea fertilizer and with combined organic amendments than in organic amendments alone. However, application of organic amendments could increase weed competitive ability. In the first year, urea fertilizer alone and combined with organic amendments led to the greatest rapeseed yield, but in the following year, organic amendments alone were able to increase rapeseed yield approximately equal to urea fertilizer and combined with organic amendments. Application of organic amendments alone or combined with N fertilizer could be an efficient method to increase soil productivity.
Journal of Ecology and Environment, 2013
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Papers by Ruhollah Naderi