Aims: The present work was evaluated to assess the storage behaviour of microtuber as affected by its different grades.
Study Design: The experiment was laid out in a completely randomized design with three replications.
Place and Duration of Study: The experiment was conducted in the Tissue Culture Laboratory of Bangabandhu Sheikh Mujibur Rahman Agricultural University, Salna, Gazipur, Bangladesh during the period of September 2010 to February 2011.
Methodology: The experiment having two factors: microtuber from the in vitro plantlets of three potato varieties; namely- Asterix, Granola and Diamant were evaluated during storage for 3 months in refrigerator at 4 0C by <250 mg, 250-500 mg and >500 mg graded microtuber.
Results: Fresh weight of microtubers as affected by different grades is inversely proportional to their sizes. At 90 days of storing <250 mg size microtubers lost more weight in Granola followed by medium (250-500 mg) and large size (>500 mg) microtubers in Asterix and Diamant. The cumulative fresh weight loss at 90 days of storing was the highest with smaller size (<250 mg) microtubers in all varieties, while statistically it was the minimum with larger microtubers (>500 mg). The percentage of decayed microtuber was minimum quantity with larger size microtuber. Granola showed maximum 14.24% of decayed microtuber followed by Diamant and Asterix.
Conclusion: Microtuber grades is the main factor affecting storage life. Heavier microtuber about >500 mg showed minimum biomass loss during storage. They can be stored for 3 months in refrigerator at 4°C.
The cost of garlic cloves together with inconsistent emergence due to dormancy issues which needs rest or dormant period of more than three months, has contributed to the reduction of garlic production cycle in a year. Thus, pre-planting garlic clove treatment with Gibberellic acid (GA3) plant hormone and cold temperature storage duration are an important agronomic concern for dormancy breaking of local garlic (Allium sativum L.) variety. Greenhouse experiment was conducted in the spring cropping season of 2013 to investigate the effect of GA3 concentration (0, 125, 250 and 375 ppm) and cold storage (7°C) durations (10, 20, and 30 days) on emergence of local garlic cultivar. The treatments were laid out in factorial arrangement with three replications using completely randomized design. The interaction effect of GA3 and cold storage duration significantly increased on emergence percentage (96.66%), emergence rate (1.09) and number of sprouted cloves 0.447(100%) at GA3 125 ppm for 20 days of cold storage duration. In conclusion the result of the experiment revealed that treatment GA3 125 ppm with 20 days of cold storage duration is required for attaining optimum emergence performance of the local garlic variety in Haramaya Eastern Ethiopia.
Salicylic acid (SA), an endogenous plant growth regulator has been found to generate a wide range of metabolic and physiological responses in plants thereby affecting their growth and development. Broccoli plant was grown under saline condition with foliar application of SA as alleviating agent for salt toxicity. Plants were treated with 0, 4 and 8 dS m-1 concentration of NaCl solution along with three levels of foliar application of SA such as 0, 0.25 and 0.50 mM. Growth and development of broccoli was gradually decreased under increasing level of salinity and mostly hampered at 8 dS m-1. Plant height, leaf size, foliage coverage as well as curd size and weight were also reduced at 8 dS m-1 of salinity. SA worked against the induced toxicity by salinity through improving growth behavior, yield component and yield. The improvement of plant height, leaf size (leaf length and breadth), foliage coverage, stem diameter, curd length, breadth and weight were enhanced with increasing concentration of SA where 0.50 mM of SA showed the better result. This study concludes that exogenous foliar spray of SA mitigates the salt toxicity in broccoli cultivation by improving morphology and yield contribution.
In cotton and cereals production systems, one of the most important causes of soil fertility depletion is the inappropriate crop residues management.
Aims: To improve the productivity and soil fertility, crop residues management (CRM) and fertilization effects on soil chemical properties and crops yields were assessed in a cotton-cereals rotation.
Study Design: The experimental design was simple non-randomized blocks design having 3 treatments.
Place and Duration of Study: This long-term experiment was carried out on station from 1982 to 2012.
Methodology: The treatments were three crops residues management practices, combined with rock phosphate (25% P2 O5 and 35% CaO) application and the use of inorganic fertilizers. Extensive CRM consisting in exportation of crop residues was compared to semi-intensive CRM (recycling the residues into compost) and intensive CRM (recycling crop residues into farmyard manure). Soil samples were collected at 0-20 cm depth and chemical characteristics analysed. Cotton, maize and sorghum yields were also evaluated.
Results: Continuous cropping during 30 years affected significantly (P =.05), the main chemical characteristics of soils under the different crop residues management practices. From 25th to 30th year, the decrease of soil carbon, Nitrogen, total P contents was very high as well as that of exchangeable bases, particularly Ca2+ and Mg2+ contents. The cation exchange capacity (CEC) decrease was 63%, 31% and 26%, respectively in extensive, semi-intensive and intensive CRM. Recycling crop residues into compost or farmyard manure did not prevent soil chemical degradation and crops yields decrease but reduced them significantly.
Conclusion: Moreover, integrated management of crop residues, reduction of soil tillage frequency and preventing soil erosion are suggested for a sustainable maintenance of soil chemical properties.
The objective of this paper was to assess the influence of single standing shade trees in cocoa agroforestry systems on soil moisture and light availability for cocoa in the dry seasons and how these environmental factors affect potential pod yields of cocoa. The research was conducted in a moist semi-deciduous forest zone of Ghana. Seven different shade trees that were commonly found in cocoa systems were selected. An effect ratio was used to compare tree sub-canopy effects to the open area effects. Morinda lucida (0.19), Spathodea campanulata (0.16) and Ficus capensis (0.13) showed favourable soil moisture conditions, however Citrus sinensis (-0.26) revealed a lower soil moisture content in the sub-canopy. Entandrophragma angolense and Terminalia superba had the highest transmitted percentage light of 69.2% and 67.1% respectively and the lowest being Mangifera indica (3%). The potential pod yields of cocoa were higher under Morinda lucida (0.40), Terminalia superba (0.40) and Entandrophragma angolense (0.35) but lowest under Mangifera indica (-0.55). Morinda lucida, Spathodea campanulata, Entandrophragma angolense and Terminalia superba in cocoa agroforestry systems potentially ensure higher soil moisture content and light availability in the sub-canopy, especially during the dry seasons, which could translate into higher cocoa pod yields.