Effects of High Temperature Treatment on the Sprouting and Elongation Rate of Asparagus Spears

Abstract

In this study, we investigated the effect of high temperature on spear sprouting and elongation in asparagus to explore new approaches to control the harvest period in asparagus production. Four-year-old rootstocks of 'UC157' were grown in chambers in the dark at 30°C (30°C treatment), 34°C (34°C treatment), 38°C (38°C treatment), and 42°C (42°C treatment) for 14 days, and then at 25°C for 18 days. In the 42°C treatment, no spear sprouting was detected, and all rootstocks died. During the high temperature period, the number of sprouted spears was significantly lower in the 38°C treatment than in the 30°C treatment, whereas after the high temperature periods, the number was significantly higher in the 38°C treatment than in the 30°C and 34°C treatments. The total number of sprouted spears during and after the high temperature periods was not significantly different between the 30°C, 34°C, and 38°C treatments. The elongation rate of the spears during the high temperature period was significantly lower in the 38°C treatment than in the 30°C and 34°C treatments, whereas there were no significant differences in the mean spear elongation rate after the three high temperature treatments. These results suggest that a temperature of 38°C can be used to control spear sprouting reversibly by its application and cancellation.

Turion: A Physiological Crop Model for Yield Prediction of Asparagus Using Sentinel-1 Data

“…Growth rates of daily elongation of asparagus shoots increase between minimum temperatures 7-10 ∘ C to maximum of 25-30 ∘ C and when the shoot is longer (Castagnino et al, 2006). Spear growth rates over 34 ∘ C was significantly low (Watanabe et al, 2019). Moreover, traditional knowledge of producers from Peru stated that when Tmin values were under 12 ∘ C the spear production is significant less compare days with higher Tmin.…”

“…This study defined the temperature-dependent growth rate of asparagus, using two values of T b following the studies of (Wilson et al, 1999, Wilson et al, 2002. The optimum temperature for asparagus growth is 20 ∘ C (Yen et al, 1996) and its growth rate increase up 35 ∘ C (Hills, 1986;Watanabe et al, 2019). The growth rate found in Peru showed 3-4 cm day −1 the first day after emergence and 10 cm day −1 at second day after emergence of spears over the soil surface.…”

“…An asparagus crop model for yield prediction requires solar radiation data to calculate the rate of root WSC recharge from the canopy. Moreover, spear growth rate has long been recognized as a temperature dependent process (Culpepper and Moon, 1939;Watanabe et al, 2019). However, neither of the Crop Simulation Models (CSM) have been developed for the continuously cycling crop grown in Peru, where temperatures are much higher than in seasonal production temperate zones.…”

Short-term Low Oxygen Treatment Immediately After Planting Alters Asparagus officinalis var. UC157’s Harvest Timing

“…In addition, in terms of profitability, it is important to control the harvest timing of white asparagus; thus, studies have investigated the relationship between white asparagus sprouting and environmental conditions surrounding the crown. Heißner et al (2006) examined the effect of soil temperature on white asparagus yield, and high temperature treatments surrounding the crowns have been shown to control white asparagus sprouting (Paroussi et al, 2002;Watanabe et al, 2019). Kitazawa et al (2014) suggested that <14% O 2 in soil surrounding the crowns was effective in controlling sprouting, and sprouting inhibition was caused by the inhibition of metabolism due to the reduction in respiration in the crowns.…”