Saffron Agronomy and Technology

Abstract In this research, the effects of solarization by transparent plastics, planting time and the first irrigation after planting on the populations of saffron bulb mite (Rhizoglyphus robini) and yield (Crocus sativus L.) were investigated. A split plot experiment was conducted based on randomized complete block design with three replicates from 2011 to 2015 in Gonabad, Khorasan Razavi province. Solarization and non-solarization factors were placed in the main plots. Seven crop managing packages including 1- planting without irrigation in September, 2- irrigation immediately after planting in September, 3- planting without irrigation in June, 4- irrigation immediately after planting in June, 5- planting in June and irrigation in August, 6- planting without irrigation in September of the next year, and 7- irrigation immediately after planting in September of the next year were placed in sub-plots. The results showed that regardless of management package, solarization suppressed the mite populations and increased saffron yield. Package 4, Irrigation immediately after planting on June, increased the mite populations and decreased saffron yields. However, package 2, irrigation on September, reduces the mite populations and increases saffron yield. Planting Saffron in June (packages 3, 4, and 5) resulted in more yield compared to Planting at September (packages 1, 2, 6, and 7). The lowest reduction in the population of mites (94%) and the highest yield (77%) were achieved through solarization and by implementing package 3, treatment and cultivation in June of the next year with no irrigation after planting.

Abstract In spite of lots of work performed by saffron farmers in the Southern Khorasan province, a desirable yield has not been obtained which is partly attributed to the lack of scientific knowledge. This investigation is aimed to assess the indigenous knowledge of saffron farmers on the issues related to irrigation, and also to examine their strengths and weaknesses for taking effective steps to increase crop productivity. A questionnaire (researcher made) including 11 questions about the issues related to irrigation and 14 questions on general information and extensional items were randomly distributed to 235 subjects in the population of farmers of the Southern Khorasan province. The dependent variable was the score of the subjects for the correct answers. Statistical comparison between the levels of each of the independent variables (with significant effect) was undertaken by Tukey-Kramer test using the SAS software. The findings revealed that the groups of subjects participating in the extension courses who were either natives in the South Khorasan province, or had insuring their products answered a greater number of questions correctly with a significant level of 1%. However, the subjects living in the villages had more correct answers at a significance level of 5%. Overall, the results suggest that short-term and long-term programming are needed for the region's farmers to gain appropriate scientific knowledge about saffron planting.

Abstract The main objective of this research was to determine indicators of technical and economic water use efficiency in the cultivation of saffron and wheat in the Qaenat region located in the South Khorasan province in Iran), where 50 wheat farms and 48 saffron farms were investigated during 2011 and 2012. For this purpose, the necessary information about farmer’s age and education, crop yield, the area under wheat and saffron cultivation, type of irrigation source, water flow rate and the number and duration of irrigation were collected by using a questionnaire. The results showed that the calculated indicator of water use efficiency was 0.84 and 0.34 kg.m-3 for wheat total biomass and grain and 0.36 and 0.002 kg.m-3 for saffron total biomass and stigma, respectively. Economic water use efficiency was estimated to be 23706.43 and 1836.89 Rials per cubic meter of water use in saffron and wheat production systems, respectively. There was a significant difference between the different ages of saffron farms for economic water use efficiency and the maximum value of this indicator was related to five-year old farms. Education of the farmers and the area under cultivation were identified as  factors influencing  the studied measures for wheat. Also, the results showed that there is a significant negative correlation between economic water use efficiency and soil salinity.