# Changes in Quality of Carya illinoinensis at Different Harvest Periods

## TL;DR

This study determines the best harvest times for two pecan cultivars in Nanjing to maximize quality and commercial value.

## Contribution

Identifies optimal harvest periods for ‘Pawnee’ and ‘Wichita’ pecans based on quality parameters.

## Key findings

- ‘Pawnee’ quality peaks in late September to early October.
- ‘Wichita’ quality peaks in late October.
- Delayed harvest reduces respiration and IAD values in pecan fruits.

## Abstract

In order to determine the appropriate harvesting period of Carya illinoinensis planted in Nanjing city of China, this study analyzed the phenotypic characteristics and inclusions, including single fruit quality, fruit transverse and vertical diameter, kernel rate, water content, color, respiratory strength, crude fat, soluble sugar, soluble protein, and total phenols, of two cultivars ‘Pawnee’ and ‘Wichita’ during September and October, respectively. Results showed that the respiration intensity and IAD values of pecan fruits decreased as the harvest date was delayed. ‘Pawnee’ fruits exhibited the highest seed kernel fullness, ∆E value, fruit transverse diameter, shape index, kernel yield, crude fat, and total phenolic content in late September and early October, while the quality of ‘Wichita’ fruits reached its peak in late October. The appropriate harvest period is conducive to the material accumulation of Carya illinoinensis, which is of great practical significance for improving the commodity value of pecans. The optimal harvesting period for ‘Pawnee’ in Nanjing is from the end of September to the beginning of October, and the optimal harvesting period for ‘Wichita’ is from mid- to late-October to the end of October.