Journal of Crop Nutrition Science
Volume:9 Issue: 4, Autumn 2023

The crop needs growth regulators in order to complete the growth, because of its important role in improving biological activity, as many researches and studies indicated that the treatment of plants with a specific growth regulator leads to the improvement of the plant structure and the yield quality and the production of seeds.
Current study was done to evaluate effect of Different level of Concentration and Time of Application Gibberellin on crop production and growth indices of Canola genotypes.
This research was done via combined analysis split plot factorial experiment based on randomized complete blocks design with three replications along 2015-16 and 2016-17. The main factor included different level of canola genotype (Hyola401, RGS003, Jerry) and sub factors consisted different concentration of gibberellin hormone (0, 50 and 100 mg.l-1) and different time of application of gibberellin hormone (Planting, vegetative phase before flowering, flowering until pod emergence).
According result of analysis of variance effect of genotype, concentration and time of application gibberellin on studied traits was significant at 5% probability level (on seed yield at 1%) but interaction effect of treatments was not significant. Mean comparison result of different level of genotype indicated that maximum studied traits were noted for Hyola401 and minimum of those belonged to Jerry. As for Duncan classification made with respect to different level of Gibberellin Concentration maximum and minimum amount of studied traits belonged to 100 ppm and control. Between different levels of time of gibberellin application the maximum studied traits was observed in vegetative phase and the lowest ones were found in ripening phase.
Finally according result of current research application Hyola401 in amount of 100 ppm Gibberellin Concentration at Vegetative Phase had the highest amount of growth indices and seed yield and it can be advice to producers in studied region.

Suitable and useful usage of different kind of fertilizers is the main way for reformation and potential of soil fertility and increasing of crops yield.

This study was conducted with the aim of evaluating the effect of drought stress and potassium sulfate application on the crop production and qualitative traits of mung bean genotypes.

Current research was done according a factorial split plot based on randomized complete block design with three replications at two years in the summer of 2010 and 2011 at the Safiabad Agricultural Research Center, Dezful. Different irrigation levels (irrigation after 120, 180 and 240 mm of evaporation) belonged to main plot and potassium fertilizer (without fertilizer consumption, 37.5 and 75 kg.ha-1 from potassium sulfate source) with genotype (included the varieties of Parto, Indian mass and the promising lines VC6173, KPS1, Cn95) were placed in subplots.

The results showed that water deficit stress significantly affected the yield traits, stomatal conductance, harvest index and the amount of chlorophyll, so that severe and mild drought stress reduced the seed yield by 30.4 and 21.9%, respectively, compared to the optimal conditions. Among genotypes, the highest seed yield belonged to Pratto variety and VC6173 line were selected under optimal irrigation conditions and lowest one was related to KPS1 line. The use of potassium fertilizer increased the tolerance of all genotypes to drought stress. The use of potassium sulfate is due to its positive effect on the better absorption of other elements, especially nitrogen and phosphorus and increased tolerance to drought stress was effective. In general, drought stress had a significant negative effect on physiological traits of mung bean, and these characteristics also had a significant effect on the components of seed yield, so, potassium consumption had a positive and significant effect on physiological characteristics of the plant and Improved yield components.

Optimal irrigation, potassium consumption of 37.5 kg.ha-1 and use of Pratu variety, Indian mass and promising VC6173 line were recommended.

Growth regulators are organic substances besides nutrients, synthesized in plants, causing alteration in their cellular metabolism. Synthesis of some plant hormones is adversely affected by environmental factors, which causes restriction on physiological processes of the plant and ultimately, limits their growth potential. This study was designed and implemented with the aim of evaluating foliar application of different amounts of auxin hormone on the physiological traits and seed yield of wheat cultivars. Current research was conducted in the crop year of 1400-01 in Ahvaz city according split plot experiment based on completely randomized block design (RCBD) with three replications. The treatments included wheat cultivars at three levels (Chamran 2, Behrang and Mehrgan) and auxin hormone at three levels (including zero or control, 50 ppm and 100 ppm), which were placed in the main and sub plots, respectively. The results showed that the difference between cultivars and different amounts of auxin hormone consumption was statistically significant in terms of effect on total dry matter, leaf area index, crop growth rate and seed yield. The mutual effects of cultivars and auxin hormone had a significant effect on seed yield. The highest seed yield (with an average of 490.2 gr.m-2) belonged to the Chamran 2 cultivar and the use of 100 ppm of auxin hormone, and the lowest seed yield (with an average of 360.6 gr.m-2) belonged to the Mehrgan cultivar and no auxin application. According to the test results, the use of 100 ppm of auxin hormone compared to other treatments significantly improved the growth and yield of Chamran 2 wheat seeds.

The application of paclobutrazol as a growth stimulant not only increases the cold tolerance of sugarcane but also enhances its yield.
To investigate the effect of different concentrations of paclobutrazol in enhancing winter tolerance of sugarcane variety CP48-103 this study was carried out.
Current research was done during the 2013 cropping season according randomized complete block design (RCBD) with three replications. The studied treatments were as control group (untreated(, burning of cold-damaged shoots, harvesting cold-damaged shoots without hormone consumption, harvesting cold-damaged shoots and spraying with a solution of 100 mg.lit-1 paclobutrazol, harvesting cold-damaged shoots and spraying with a solution of 150 mg.lit-1 paclobutrazol, spraying solution on cold-damaged shoots with a concentration of 100 mg.lit-1 paclobutrazol, spraying solution on cold-damaged shoots with a concentration of 150 mg.lit-1 paclobutrazol.
The highest chlorophyll content, measured at 40 (Spad), was observed in harvesting cold-damaged shoots and spraying with a solution of 150 mg.lit-1 paclobutrazol. Among the treatments, the highest amount of syrup (with an average of 31%) was observed in the treatment of burning of cold-damaged shoots, while the lowest amount (with an average of 28%) was found in the treatment of harvesting cold-damaged shoots without hormone consumption. The sucrose percentage displayed a significant increase from October 15 to October 30 in different treatments. This indicates that the sucrose content in the sugarcane increased during this period across all treatments. The burning treatment resulted in the lowest percentage of sucrose, with an average of 11%. The percentage of extractable sugar reached its peak on December 6 and across different treatments, the highest amount of extractable sugar (with an average of 8.5%) was obtained from treatment involving the harvesting cold-damaged shoots and spraying with a solution of 150 mg.lit-1 paclobutrazol. In terms of stem yield, the highest and lowest values (with an average of 59800 and 51280 kg.ha-1, respectively) were recorded in treatment of harvesting cold-damaged shoots and spraying with a solution of 150 mg.lit-1 paclobutrazol and control treatment, respectively.
The treatment involving the application of paclobutrazol significantly increased the stem yield of sugarcane compared to the control treatment.

Long-term use of fertilizers reduces crop yields. This decrease is due to the acidification of the soil, the reduction of biological activity of the soil and the inappropriate physical properties of the soil. So nutrient management plays an important role for obtaining economic and sustainable yields and increase crop productivity.
This study was carried out to evaluate combined effect of Sulfur and Sulfofertilizer1 of wheat cultivars on seed yield and its components.
Current research was done by using a split-plot experiment within randomized complete blocks (RCBD) design with three replications. The experimental treatments consisted of three levels of sulfur fertilizer (control, no consumption; 270g of sulfur fertilizer; and 270g of sulfur fertilizer + 6g of Sulfofertilizer1, biofertilizer) and three wheat cultivars (Mehregan, Chamran 2 and Khalil), which were assigned to the main and sub plots, respectively.
Result of analysis of variance revealed effect of different level of fertilizer (instead number of seed per spike at 5%), cultivar (instead number of seed per spike at 5%) and interaction effect of treatments on all studied characteristics (instead number of seed per spike and harvest index was not significant) was significant at 1% probability level. Assessment mean comparison result of different level of fertilizer indicated the maximum amount of grain yield (464.73 gr.m-2), number of spike per m-2 (416.5), number of seed per spike (40.1) , 1000-seed weight (43.11 gr), biologic yield (1400.8 gr.m-2) harvest index (33.17%) were noted for Sulfur + Sulfurfertilizer1 and lowest amount of mentioned traits belonged to control treatment. Compare different level of cultivar showed Khalil was superior to another one and had the highest amount of measured traits.
Generally result of studied research revealed using Sulfur + Sulfurfertilizer1 by Khalil cultivar had the highest amount of studied characteristics and it can be advice to farmers.

Zeolite materials can reduce losing soil moisture in arid and semi-arid regions by soil physical improvement. These storage tanks absorb water provided by irrigation and rainfall and reduced permeability of soil. In drought stress condition, water saved in the polymer is gradually depleted and reduces need for re-irrigation.
This research was carried out to evaluate effect different level of water stress and Clinoptilolite on effective traits on Corn seed yield.
This study was done via split plot experiment based on randomized complete blocks design with three replications along 2021-2022 agronomic years. The main factor included Irrigation cycle based on evaporation from class A evaporation pan (I1: 50 mm evaporation or none stress or control, I2: 75 mm evaporation or Moderate stress, I3: 100 mm evaporation or severe stress). Also different level of Clinoptilolite (C1: control, C2: 4 and C3: 8 t.ha-1) belonged to subplots.
According result of analysis of variance effect of different level of water deficit and Clinoptilolite on all studied traits (instead harvest index) were significant but interaction effect of treatments was not significant. Compare different level of Clinoptilolite showed that the maximum amount of seed yield (4837.78 kg.ha-1), biologic yield (10486.7 kg.ha-1) and water use efficiency (1.5 kg.m-3) belonged to 8 t.ha-1 and lowest amount of mentioned traits were for control treatment. Mean comparison result of different level of water deficit indicated that maximum amount of measured traits was noted for control and minimum of those belonged to severe stress treatment.
Adding Clinoptilolite to the soil under water stress conditions caused a 14% increase in biological yield and a 20% increase in corn seed yield in compare to the condition of not using this mineral. So that the consumption of 8 t.ha-1 of zeolite led to produce highest seed yield and it dose advised to farmers in studied region.