A Model of Asparagus Growth Physiology

Economic Analysis of the Inter-Year Effect of Alternative Harvesting Strategies for Asparagus

“…1 exp 0.02232 24 (Wilson et al, 2002b)(2) Cembali et al 33 where, L t is the length of a spear, U is the length of the underground part of the spears before its emergence from the ground that was 12 cm (Wilson et al, 1999). No growth was accounted for when average temperature of the period t (T t ) was lower than the limiting temperature Tb that was reported equal to 7.1ЊC (Wilson et al, 1999).…”

“…Detailed information on equations 6 to 9 can be found in Lampert et al (1980). Although Wilson et al (2002b) proposed a more sophisticated method for accounting for CHO assimilation and translocation, the simplified approach by Lampert et al (1980) was chosen because of the lack of field trials confirming the Wilson et al (2002b) approach.…”

“…There are two crop models available for predicting when to stop harvesting asparagus (Lampert et al, 1980;Wilson et al, 2002b). Both models addressed the overall biological cycle of asparagus.…”

“…The Lampert et al (1980) model described simulation results, and presented total seasonal production, but the results did not represent a commercial production situation (Dean, 1999). Wilson et al (2002b) described their model based on dormant phase, spear growth, fern growth, and CHO assimilation, without reporting any actual prediction, either daily or seasonal.…”

“…Many researchers addressed the issue of when to stop harvesting with trials on harvest duration (Shelton and Lacy, 1980;Lampert et al, 1980;Wilson et al, 2002b;and Paschold et al, 2002). The bioeconomic model for asparagus developed by Cembali (2004) addressed the issue of timing in harvest of asparagus, but does not account for CHO accumulation because the simulation assumed that CHO assimilation was always adequate for the following year's production.…”