Plant Productions

Estimated Extinction Coefficient, Radiation Use Efficiency and Dry Matter Distribution Coefficients Cultivar Hyola 401 of Canola in Ahvaz

hossein kamaei; Gh. Fathi; A.R. Abdali Mashhadi; J. Porreza; M.H. Gharine

Volume 39, Issue 1 , June 2016, , Pages 21-34

https://doi.org/10.22055/ppd.2016.11952

Abstract

Background and Objectives Canola crops has a special place due to specific features among crop plants and it has drawn the attention of researchers in recent years. During the period ... Read More Background and Objectives Canola crops has a special place due to specific features among crop plants and it has drawn the attention of researchers in recent years. During the period before flowering, it is observed that 72 to 83% of the total dry matter in leaves and 17 to 28% accumulates in the stem. In the period post flowering, most dry matter is (50% to 56%) in the stems that most this the material of the leaves will be obtained that they have to 8 to 11 % the total dry matter in the course. At the maturity stage, stems and pods are included 46 to 51% and 49 to 59% of the dry matter respectively. Canola reaches in time of flowering to LAI maximum and then gradually reduced LAI so that at harvest time reaches almost to zero. K value for the products with mainly vertical leaves, or with leaves coincided together that have found host state, is variable between 0.3 to 0.45. The RUE is for winter canola 1.2 and for spring canola 1.5 g/MJ photosynthetically active radiation. This amount at time of filling grain arrives to about 0.4 to 0.75 g/MJ photosynthetically active radiation. This experiment is to investigate share different organs canola cultivar Hyola 401 from allocation dry matter and obtain baseline K and RUE occurred in Ahvaz conditions. Materials and methods This experiment done to form factorial whit two factors planting date in three levels (November 29, December 19 and January 8) and the density at four levels (50, 70, 90 and 110 plants per square meter) in randomized complete block design with 4 replications in the 2011-2012 crop year. To measure the relation incoming radiation used from the vertical imaging. Due to having relation incoming radiation for determine the K used from the equation FI= l - exp(-k×LAl). RUE obtained from line slope of dry matter accumulation againts the cumulative radiation received. In order to describe the trend changes LAI againts the days after planting used from the equation LAl= ((a×exp((-a)×(dap-b)×c))/(l-exp((-a)×(dap-b)))2. In order to describe the distribution rate of dry matter in different plant organs from stem elongation to flowering, flowering to pod filling and pod filling to maturity stages used from the equation y=bx. Results The results showed that with increasing density, LAI rising. In addition, with delay in planting LAI showed a decreasing trend. K values obtained between the different planting dates and plant density did not show significant differences and the value it for the photosynthetically active radiation canola cultivar Hyola 401was 0.39. In addition, RUE values Obtained about 0.92 g/MJ. Effect of plant density on dry matter distribution was more than planting date. Discussion Increase in LAI by increased density can be considered due to increasing the number of plants and Increase the number of leaves. Reduce the LAI by delayed planting can be considered due to Shorten the growth period and increase in day length and temperature. Lower effect planting date than plant density on dry matter distribution canola cultivar Hyola 401 and as well as non-significance K and RUE in dates and different densities can perhaps be because climatic similarities of view day length and photoperiod and also low time interval between different planting dates.

Effects of drought stress and soil compaction on some agronomic traits of maize (Zea mays L.)

A. Afarinesh; G. Fathi; R. Chugan; S.A. Syadat; Kh. Alamisaid; S.R. Ashrafizadeh

Volume 38, Issue 2 , September 2015, , Pages 13-24

https://doi.org/10.22055/ppd.2015.11250

Abstract

In order to study the effect of drought stress and soil compaction on corn growth an experiment was carried out in 2012 at Safi Abad Agricultural Research Center. The treatments were ... Read More In order to study the effect of drought stress and soil compaction on corn growth an experiment was carried out in 2012 at Safi Abad Agricultural Research Center. The treatments were arranged in split plot in a randomized complete block design with three replications on 704 single cross hybrid corn. Drought stress was considered as the main plot at 4 levels (irrigation after 75, 95, 115 and 135 mm evaporation from A pan), and soil compaction was as the subplot at 4 levels (no traffic congestion, mild with four times, the average density with 8 times and the intensity density with 12 times of tractor traffic). Based on the results, the drought and soil compaction stresses affected many of the traits. The effects of drought and soil compaction were statistically significant on stem diameter, root deep, number of brace roots per plant, root and shoot dry weight, harvest index, number of ear bearing plants at harvest and grain yield characteristics. The effect of soil compaction stress was significant on root dry weight and reduced it. Only the effect of drought stress was significant on chlorophyll and protein characteristics. Brace roots growth in soil compaction stress conditions was stimulated and was higher than drought conditions. But grain yield was not affected by increasing the number of brace roots. Increase in soil compaction prevented root growth to depth. Conversely, the drought stress cause increased root growth to depth. Stresses weakened maize stem diameter with constant process. The constant processes were observed in reduction of shoot and grain yield dry weight by application of stresses. The drought stress more than soil compaction can affect chlorophyll and protein content of grain. This indicates the important role of water in the field. Drought stress was able to reduce the harvest index, but soil compaction in the most severe condition can reduce it. Both stresses reduced the number of ear bearing plants.

Effects of various periods of water logging surface stress in the different growth stages on yield and yield components of barley (Hordeum vulgare L.) under Khuzestan environment

M. Khalafi; M.H. Gharineh; A. Bakhshandeh; E. Lakzadeh; G. Fathi

Volume 36, Issue 2 , September 2013, , Pages 87-97

Abstract

In order to study the effects of different levels of water logging at different growth stages on yield and yield components of barley WB-79-10, a field experiment was carried out using ... Read More

The effect of irrigation timing and different fertilizer systems (NPK application) and manure on remobilization and current photosynthesis in bread wheat (Triticum aestivum L.)

M. Namarvari; Ghodratallah fathi; A. Bakhshandeh; M.H. Gharineh; S. Jafari

Volume 36, Issue 2 , September 2013, , Pages 99-109

Abstract

This field experiment was conducted for evaluation of irrigation timing on different fertilizer systems on yield and yield components of wheat (Chamran v.) in 2009-2010. The experiment ... Read More

Determination of critical period of weed control in corn (Zea mays L.) in Ahvaz region

A. Gerami; S.A. Siadat; A.M. Bakhshandeh; Ghodratallah Fathi; K. Alami Saeid

Volume 36, Issue 1 , June 2013, , Pages 39-49

Abstract

In order to determine the critical period of weed control in grain corn (Zea mays L.), a field study was conducted at the Ramin University ofAhvaz Research Field in 2009. The experiment ... Read More

Effect of chemical, organic and biological fertilizers systems on yield and yield components of wheat genotypes (T. aestivum and T. durum) in Ahvaz conditions

A. Lotfi Jala Abadi; S.A. Siadat; A. Bakhsandeh; Ghodratallah Fathi; K. Alemi Saied

Volume 36, Issue 1 , June 2013, , Pages 103-116

Abstract

In order to study the effect of fertilizer systems and cultivars on wheat production, an experiment was conducted in Agriculture and Natural Resources University of Ramin, North of ... Read More

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Author = Fathi, Gh.

Estimated Extinction Coefficient, Radiation Use Efficiency and Dry Matter Distribution Coefficients Cultivar Hyola 401 of Canola in Ahvaz

Abstract

Effects of drought stress and soil compaction on some agronomic traits of maize (Zea mays L.)

Abstract

Effects of various periods of water logging surface stress in the different growth stages on yield and yield components of barley (Hordeum vulgare L.) under Khuzestan environment

Abstract

The effect of irrigation timing and different fertilizer systems (NPK application) and manure on remobilization and current photosynthesis in bread wheat (Triticum aestivum L.)

Abstract

Determination of critical period of weed control in corn (Zea mays L.) in Ahvaz region

Abstract

Effect of chemical, organic and biological fertilizers systems on yield and yield components of wheat genotypes (T. aestivum and T. durum) in Ahvaz conditions

Abstract