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Journal of Agronomy
eISSN: 1812-5417
pISSN: 1812-5379

Editor-in-Chief:  Francisco Fabian Fuentes Carmona
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Research Article
Germination and Physiological Traits to Ascertain the Ability of Hormonal Priming to Improve Salinity Tolerance in Sorghum bicolor
Jalal Ahmed Said Mohammad Al-Tabbal
Background and Objective: Salinity is the highest environmental factor that affects seedling stages negatively, thus reduces plant development and production. The objective of this study was to explore the effects of gibberellic acid (GA3) pretreatment on sorghum (Sorghum bicolor) seed germination under salt stress. Materials and Methods: Seeds were soaked in a GA3 solution (50, 100 and 150 ppm in addition to a control), dried using a drypaper, transferred to Petri dishes and treated with sodium chloride (NaCl) solutions at different concentrations (0, 2000 and 4000 ppm). Germination traits, including the length of shoot and root, the ratio of shoot to root, the weight of shoot and root, germination percentage, germination energy, germination rate and germination time and physiological traits index’s, including germination stress tolerance, seedling vigor, shoot and root length stress, fresh weight stress for shoot and root and germination speed were documented. Data was analyzed by two-way ANOVA. Treatments were arranged in a randomized complete block design, in three replications using SAS. Results: Salt stress induced by the NaCl solution significantly affected the germination and physiological traits (p<0.01). Priming seeds with GA3 (50, 100 and 150 ppm) showed a significant effect on these traits. Salt stress significantly decreased most traits, except for the mean germination time, in the absence of GA3. Increasing NaCl concentration decreased the germination and physiological traits; however, GA3 induced these traits only at the moderate salinity level (2000 ppm), whereas, no significant difference between primed and nonprimed seeds was detected at the high salinity level (4000 ppm). Conclusion: Priming sorghum seeds with GA3 play an important role in the plant response to mild salt stress.
Research Article
Drought Effect Simulation on the Growth and Yield Quality of Melon (Cucumis melo L.)
Eko Widaryanto, Karuniawan Puji Wicaksono and Hilyatun Najiyah
Background and Objective: Water is an important factor for the crop growth and development, mainly under the drought condition. The cultivation of Cucumis melo requires water both at vegetative and generative phase which are taking role for metabolic and physiological processes. Further, there are reports that melon development requires different volume of water between vegetative and generative phase. The objective of this study was to investigate the amount of water which is required to the different growth phase of melon variety Apollo to simulate the effect of drought on this changing climate. Materials and Methods: This study conducted on April, 2015 until June, 2015 in screen house using randomized block design consisting of 9 combinations of treatments and with 3 replications. The treatments include: V1G1 [water supply 100% FC (field capacity) in vegetative and generative phase], V1G2 (water supply 100% FC in vegetative phase, 75% FC in generative phase), V1G3 ( water supply 100% FC in vegetative phase, 50% FC in generative phase), V2G1 (water supply 75% FC in vegetative phase, 100% FC in generative phase), V2G2 (water supply 75% FC in vegetative phase, 75% FC in generative phase), V2G3 (water supply 75% FC in vegetative phase, 50% FC in generative phase), V3G1 (water supply 50% FC in vegetative phase, 100% FC in generative phase), V3G2 (water supply 50% FC in vegetative phase, 75% FC in generative phase) and V3G3 (water supply 50% FC in vegetative phase, 50% FC in generative phase. Analysis of the data used in this study is the analysis of variance F-test with a level of 5%. If there is significant effect on the treatment, LSD (least significant difference) is conduct at the level of 5%. Results: The results of this study showed that drought simulation to 50% both in vegetative and generative decrease 50% performance of growth of melon. However, on harvest parameters, 25% drought simulation on just vegetative phase increased 1% of yield, 559.33 g from 549.11 g (control). Conclusion: While simulating 25% drought only to generative phase, increased the level of sweetness from 14.59-15.98% or increased 9% compare to control.
Research Article
Study of Asystasia gangetica (L.) T. Anderson as Cover Crop Against Soil Water Content in Mature Oil Palm Plantation
Mira Ariyanti, Syariful Mubarok and Yenni Asbur
Background and Objective: The study of cover crop in oil palm plantation is more emphasized on its function as soil and water conservation. Cover crop utilization is one of agronomic practice to protect soil surface from any damage caused by rainfall on to the soil surface. Rooting system of the cover crop is able to hold the rain water and in turn maintaining soil water content. This study is aimed to study the effect of Asystasia gangetica (A. gangetica) as cover crop in mature oil palm plantation toward soil water content. Materials and Methods: Research was conducted in mature oil palm plantation. The experiment was conducted by constructing 4×2 m experimental plot between rows of oil palm. The experiment consisted of 2 levels of treatment namely planting cover crop A. gangetica and without planting cover crop. It was repeated 3 times. Hydrological parameter data, precipitation, initial soil water content (SWC), SWC during the experiment at specified soil depth (10, 20, 30, 40 and 50 cm) were observed from each trial plot. Soil water content (SWC) was measured using a sensor that connected with GardSens. Results: The results showed that A. gangetica caused soil water dynamics at the depth 0-20 cm that was at rhizosphere of cover crop. This has a good impact on the water availability of oil palm especially in dry periods when the rate of rainfall less than 60 mm/month. Conclusion: It was concluded that cover crop was able to conserve rain water and increased the water infiltration into the soil. This indicates that cover crop was potentially used to maintain and improve the availability of water requirement for the oil palm plantation.

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