The Effect of Corm Storage Conditions During the Summer Dormancy Stage on Reproductive Growth and Yield of Saffron

Moradi-Moghaddam, Sajjad; Fallahi, Hamid Reza; Behdani, Mohammad Ali; Mahmoodi, Sohrab

doi:10.22077/jsr.2020.3747.1141

Document Type : Original Article

Authors

¹ 1- Educated Student, Agroecology, Department of Plant Production & Genetics, Faculty of Agriculture, University of Birjand, Birjand; Iran.

² 2- Expert in Land Affairs Management of Zirkoh Agricultural Jihad, South Khorasan Province Agricultural Jihad Organization, Iran

³ 5- استاد، گروه مهندسی تولید و ژنتیک گیاهی، دانشکده کشاورزی، دانشگاه بیرجند، بیرجند. ایران.

⁴ University of Birjand

https://doi.org/10.22077/jsr.2020.3747.1141

Abstract

Introduction: Environmental factors, especially temperature, are very important in the proper occurrence of saffron flower initiation stage during summer. In areas affected by heat stress, any factor that reduces the stress intensity seems to be beneficial in improving saffron reproductive growth. Corm storage under desired environmental condition is a potential strategy, when saffron is grown as an annual crop. In perennial saffron plantation, where the corms spend the flowering stage in the soil, other solutions should be considered for the proper occurrence of the flowering stage. One of these solutions is to use plant residues in the field surface to reduce the soil temperature. The presence of plant residues causes shading on the soil surface, increases the amount of sunlight reflection, reduces evaporation from the soil, regulates the moisture content of the soil, and reduces the temperature at the depth of the corm placement. Another possible solution to adjust the soil temperature during the flower initiation phase of the corm is to carry out summer irrigation, but there is not enough certainty about its usefulness. Therefore, the aim of the current experiment was to investigate the effect of storage conditions of corms, as well as the effect of summer irrigation and the application of plant residue mulch on saffron flowering.
Materials and Methods: To investigate the effect of corm storage conditions on saffron reproductive growth an experiment was carried out as complete randomized block design with seven treatments and three replicates during 2019 growing season, in Qaen, Iran. Experimental treatments were three types of corm storage inside the soil [corm planting in 5^thJune (A) with natural soil temperature as control, A + summer irrigation in 5^thAugust and A + mulch application obtained from wheat residues at the rate of 8 ton ha^-1)] and three types of corm storage outside the soil [Corm storage at room (ambient temperature) for three months started from 5^thJune + corm planting in 5^th September (B), Corm storage in constant temperature (25 ^oC and relative humidity of ~40 %) in incubator for three months + B, three months corm storage at variable temperature in incubator (one month in 20, 25 and 20 ^oC) + B and corm storage in room (up to 5^thAugust) and incubator (up to 5^thSeptember) + B.

Results and Discussion: Results showed that summer irrigation increased the number, length and weight of cataphylls compered to control. Corm storage outside the soil (room or incubator) reduced the weight and length of cataphylls. Control and summer irrigation treatments had no significant different in terms of flower number, flowering rate and flower yield, but were superior to other treatments in terms of all the mentioned traits, especially compared with the room storage treatment. The highest values of mean flower weight (0.37 g), flower length (7.6 cm) and stigma length (2.83 cm) were obtained in mulch application treatment. Mulch application failed to improve flower and stigma yields, despite decreasing the soil temperature during the flower initiation stage. The highest values of stigma yield were gained at control, summer irrigation and mulch application (8.07, 7.28 and 6.40 kg ha^-1, respectively), which were significantly more than those obtained at room storage (3.24 kg ha^-1), storage in incubator with variable temperature (3.68 kg ha^-1), storage in room and incubator (3.89 kg ha^-1) and storage in incubator with constant temperature (4.28 kg ha^-1).

Conclusion: Overall, the passage of saffron flower initiation stage inside the soil significantly improved the flowering of the plant compared to the passage of this period outside the soil under room or incubator conditions.

Keywords

References

Alavi Siney, S. M., Ahmadpour Jolgeh, A., Behroozeh, M., & Soltani, M. (2020). Evaluation of planting date and corm weight effects on flower, stigma and daughter corms characters of saffron (Crocus sativus L.) under the south Kerman climatic conditions. Saffron Agronomy & Technology, 8(1), 59-73. (In Persian with English Summary).

Asadi, Gh.A., Khorramdel, S., Ghorbani, R., & Bicharanlou, B. (2019). Evaluation of the effect of soil fertilizers and summer irrigation on corm and flower yield of saffron. Saffron Agronomy & Technology, 6(4), 393-414. (In Persian with English Summary).

Bayat, M., Rahimi, M., & Ramezani, M. (2016). Determining the most effective traits to improve saffron (Crocus sativus L.) yield. Physiology and Molecular Biology of Plants, 22(1), 153-161.

Behdani, M.A., Fallahi, H.R., & Sardar, M. (2018). Technical Knowledge of Saffron Production. Haft-Rang Press. 58 p. (In Persian)

Behdani, M.A., & Fallahi, H.R. (2015). Saffron: Technical Knowledge Based on Research Approaches. University of Birjand Publication. (In Persian).

Galavi, M., Soloki, M., Mousavi, S.R., & Ziyaie, M. (2008). Effect of planting depth and soil summer temperature control on growth and yield of safrron (Crocus sativus L.). Asian Journal of Plant Sciences, 7(8), 747-751.

Ghobadi, F., Ghorbani Javid, M., & Sorooshzadeh, A. (2015). Effects of planting date and corm size on flower yield and physiological traits of saffron (Crocus sativus L.) under Varamin plain climatic conditions. Saffron Agronomy & Technology, 2(4), 265-276. (In Persian with English Summary).

Fallahi, H., & Mahmoodi, S. (2018). Impact of water availability and fertilization management on saffron (Crocus sativus L.) biomass allocation. Journal of Horticulture and Postharvest Research, 1(2), 131-146.

Feizi, H., Mollafilabi, A., Sahabi, H., & Ahmadian, A. (2015). Effect of summer irrigation and conservation tillage on flower yield and qualitative characteristics of saffron (Crocus sativus L.). Saffron Agronomy & Technology, 2(4), 255-263. (In Persian with English Summary).

Jafarimoghadam, M., Ghasemi, E., & Khalesi, N. (2018). Soil temperature and moisture as affected by mulching and cover crop management in saffron (Corocus sativus L.). 21^st Conference of International Soil Tillage Research Organization (ISTRO). 24-27^th September, Paris, France.

Karimi Se-Qala, H., Ansari, H., & Beizai, A.N. (2015). The effect of summer irrigation and mulch cover on saffron stigma yield. The first national congress for the development and promotion of agricultural engineering and soil sciences in Iran. 28^th January, Tehran, Iran. (In Persian).

Katawazy, A.S. (2013). A Comprehensive Study of Afghan Saffron. Research Planning and Policy Directorate, Afghanistan Investment Support Agency (AISA) 46P.

Koocheki, A., Nassiri Mahallati, M., Alizadeh, A., & Ganjali, A. (2009). Modelling the impact of climate change on flowering behaviour of Saffron (Crocus sativus L.). Iranian Journal of Field Crops Research, 7(2), 583-594. (In Persian with English Summary).

Koocheki, A., Alizadeh, A., & Ganjali, A. (2010). Effect of temperature increase on flowering behavior of saffron (Crocus sativus L). Iranian Journal of Field Crops Research, 8(2), 324-335. (In Persian with English Summary).

Koocheki, A., Rezvani Moghaddam, P., Mollafilabi, A., & Seyyedi, S.M. (2015). Effects of corm planting density and manure rates on flower and corm yields of saffron (Crocus sativus L.) in the first year after planting. Journal of Agroecology, 6(4), 719-729. (In Persian with English Summary).

Koocheki, A., Rezvani Moghaddam, P., & Fallahi, H.R. (2016a). Effects of planting dates, irrigation management and cover crops on growth and yield of saffron (Crocus sativa L.). Journal of Agroecology, 8(3), 435-451. (In Persian with English Summary).

Koocheki, A., Rezvani Moghaddam, P., Fallahi, H.R., & Aghhavani Shajari, M. (2016b). The study of saffron (Crocus sativus L.) replacement corms growth in response to planting date, irrigation management and companion crops. Saffron Agronomy and Technology, 4(1), 3-18. (In Persian with English Summary).

Koocheki, A., Fallahi, H.R., & Jami Al-Ahmadi, M. (2020). Saffron Water Requirement. In: Saffron: Science, Technology and Health (Eds: Koocheki, A., Khajeh-Hosseini, M). Woodhead Publishing.

Kumar, R., Singh, V., Devi, K., Sharma, M., Singh, M.K., & Ahuja, P.S. (2009). State of art of saffron (Crocus sativus L.) agronomy: a comprehensive review. Food Reviews International, 25, 44-85.

Harivandi, M.R., Rezvani Moghaddam, P., Khoramdel, S., & Moayedi, A.A. (2019). Effect of amount and time of wheat straw application as mulch on flowering and morphological characteristics of replacement corms of saffron (Crocus sativus L.). Saffron Agronomy & Technology, 7(3), 301-318. (In Persian with English Summary).

Molina, R.V., Valero, M., Navarro, Y., García-Luis, A. & Guardiola, J.L. (2004). The effect of time of corm lifting and duration of incubation at inductive temperature on flowering in the saffron plant (Crocus sativus L.). Scientia Horticulturae, 103(1), 79-91.

Molina, R.V., Valero, M., Navarro, Y., Guardiola, J.L., & García-Luis, A. (2005). Temperature effects on flower formation in saffron (Crocus sativus L.). Scientia Horticulturae, 103, 361-379.

Mollafilabi, A. (2014). Effect of new cropping technologies on growth characteristics, yield, yield components of flower and corm criteria of saffron (Crocus sativus L.). Ph. D Dissertation, Faculty of Agriculture, Ferdowsi Univesity of Mashhad. (In Persian with English Summary).

Nassiri Mahallati, M., Koocheki, A., Boroumand Rezazadeh, Z., & Tabrizi, L. (2007). Effects of corm size and storage period on allocation of assimilates in different parts of saffron plant (Crocus sativus L.). Iranian Journal of Field Crop Research, 5(1), 155-166. (In Persian with English Summary).

Rezvani Moghaddam, P., Koocheki, A., Mallafilabi, A., & Seyyedi, S.M. (2013). The effects of different levels of applied wheat straw in different dates on saffron (Crocus sativus L.) daughter corms and flower initiation criteria in the second year. Saffron Agronomy and Technology, 1(1), 55-70. (In Persian with English Summary).

Sadeghi, B. (1997). The effect of summer irrigation on saffron yield. Publications of Iran Scientific and Industrial Research Organization. (In Persian).