Effect of Time of Planting and Age at Harvest on Marketable Yield and Quality of Four Tanier Cultivars

Abstract

An experiment was initiated in April 1972 at the Isabela Substation to evaluate the effect of season of planting and age at harvest on yield and tuber quality of four tanier cultivars. Bimonthly plantings were made from April 1972 to February 1973. Cultivar Kelly was harvested at 8 and 10 months of age, whereas Blanca del País, Morada, and Rascana were harvested at 10 and 12 months. The best planting dates appeared to be from April through August. A sharp reduction in marketable yield was evident for all cultivars planted after this period. For all planting dates the best yields were obtained when both Rascana and Morada were harvested at 12 months of age. Yields of Blanca del País, the standard tanier for the Isabela area, were inferior to those of the other cultivars with the excepton of Kelly. In general all cultivars were favored by the 2-month delay in harvest. However, Rascana was most favored by this delay, which significantly increased the number of marketable tubers. Planting dates and age at harvest had no effect on tuber internal quality. Although the delay in harvest somewhat softened the texture, cooked tubers were rated "acceptable" by a tasting panel.

Simulated Dynamic Optical Response Strategy for Model Identification of Metal Colloid Synthesis

“…Nevertheless, in all cases, the general features of the kinetic data presented in this section remained the same. Furthermore, similar data have been obtained for other syntheses to form spherical silver and gold particles, − also showing similar trends.…”

“…In this study, the reduction of silver-ethylenediamine (EDA) complex with ascorbic acid is used as a model system . Ascorbic acid is a versatile reducing agent used in the development of many systems to make spherical and crystalline silver particles. ,,, Ethylenediamine is an example of many possible amines that can effectively complex the silver to reduce the redox potential to make larger colloidal particles. Depending on the experimental conditions, the size of these particles ranges from 0.1 to 2.0 μm.…”

“…The overall reaction is 2 false[ Ag ( C 2 H 8 N 2 ) false] + + C 6 H 8 O 6 → 2 Ag 0 + C 6 H 6 O 6 + 2 C 2 H 8 N 2 + 2 H + The final morphology of the particles consists of nanounits . Similar spherical particles have been developed using EDA and hydroquinone as reducing agent (see Figure ).…”

“…Scanning electron micrographs (SEM) of monodisperse silver particles obtained with the EDA method using a different reducing agent …”

“…Given the fast dynamics, the system cannot be sampled in real time, making the kinetics of particle formation difficult to study. The author and co-workers have used a rapid mixing stopped-flow reactor with multidiode array to collect UV−vis absorption as a function of time during the precipitation process of different syntheses for gold and silver. − The advantage of using UV−vis spectra to study the kinetics of metal particle formation is that it can be obtained very quickly and in a noninvasive fashion. The plasmon resonance characteristics of metal particles can be utilized to understand the formation of metal particles.…”