Evaluation of the radish Vikima cultivar growth stages by regression models in spring planting at Gorgan city.

Abstract

Growth analysis is considered a valuable method for quantitative assessment of growth, development, and agricultural crop development as well as a powerful method for measuring/estimating long term photosynthesis net assimilation/production. Among growth-related parameters/characteristics, the value of dry matter is considered a determining factor due to higher economic importance. The pattern of dry matter/weight distribution in different plant parts is followed by agricultural crops development stages. Studies of growth and dry matter accumulation in different agricultural crops show that dry matter production is dependent/ related to leaf area index, solar radiation interception during growth stages, and plant utilization of solar radiation. The experiment was carried out in a factorial-RBD design with three replications at research farm of Gorgan Natural Resources and Agricultural Sciences University located at 5 Km to Kordkoy-Gorgan old street. The sown radish cultivar was Vikima which is a short-duration variety, market-choice and of small aerial canopy volume. The plot size was 4 m2 and each compromised of 10 rows. Row to row distance and plant to plant distance were 20 and 5 cm, respectively. 400 seeds were sown in each plot. Generally, with an assessment of the study traits variability, it could be concluded that radish Vikima cultivar by 5th leaf emergence, till day 27, produces leaf in an identical sequence. Later on, from day 37 onwards it produces leaves at a high-rate pace and from day 34 the tuber root which increases its diameter, length, and volume uniformly at the same time with the leaf expansion, starts rapidly to increase its fresh and dryness weights. Further, the weight gaining of tuber roots will start from day 34 onwards. In addition, based on found equations, variation of each study trait can be predicted from sowing time till 45 days.