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T. Casey Barickman, Dean A. Kopsell, and Carl E. Sams

Plants encounter various environmental stresses that can potentially impact nutritional requirements and fruit quality. Environmental stress factors frequently influence vegetative development by inhibiting plant growth. Studies have demonstrated

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Xinhua Yin, Jinhe Bai, and Clark F. Seavert

Oregon. The objective of this study was to evaluate the effects of split fertigation and band placement as alternate N and P management practices on tree nutrition, fruit yield, quality, and superficial scald of pears, as well as soil nutrient supply

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Ruimin Huang, Chao Shen, Susu Wang, and Zhengjia Wang

in protein synthesis, membrane stability, cell division, and metabolism ( Hajiboland and Amirazad, 2010 ). The application of Zn fertilizer at appropriate rates can enhance the fruit quality of fruit trees significantly ( Davarpanah et al., 2016

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Adam D. Karl, Michael G. Brown, Sihui Ma, Ann Sandbrook, Amanda C. Stewart, Lailiang Cheng, Anna Katharine Mansfield, and Gregory M. Peck

ensure the success of these new enterprises, additional research is needed to determine how orchard management affects cider quality. In particular, there has been minimal research on how preharvest nitrogen fertilizer management in apple orchards might

Open access

Jiwoo Park and James E. Faust

). Additionally, fertilizer is relatively inexpensive; therefore, growers have tended to err by applying excess fertilizer to avoid nonoptimal growth and nutritional deficiencies. However, excessive fertilizer application results in nutrient runoff, which has

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M.L. Arpaia

Although postharvest handling schemes have improved during recent years, it is still possible to observe considerable variability in fruit quality between individual lots. Preharvest factors such as irrigation, nutrition and pest management practices, as well as rootstock and environmental variables, may greatly influence quality after harvest and may well account for some of the differences between individual lots. The influence of preharvest factors on postharvest quality of tropical and subtropical fruit will be discussed using pertinent examples from the literature. Emphasis will be given to those factors which can be manipulated to improve quality.

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Vicente Gimeno, James P. Syvertsen, Inma Simon, Vicente Martinez, Jose M. Camara-Zapata, Manuel Nieves, and Francisco Garcia-Sanchez

interstock, grafted between the rootstock and scion combination, not only can improve tree growth, longevity, fruit production, and quality ( Gil-Izquierdo et al., 2004 ), but also can increase salinity tolerance ( Gimeno et al., 2009b ). The mechanisms

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C.M. Geraldson

116 ORAL SESSION 34 (Abstr. 253–260) Nutrition/Cross-commodity & Ornamentals

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Ming-Wei S. Kao, Floyd Woods, William A. Dozier, Robert C. Ebel, Chang Y. Lee, and Jun Bae Jee

The health status of Alabama's population ranks above the national average with respect to the prevalence of poor overall health indicators. Consumer knowledge of the health benefits of consumption of fresh fruit is lacking. The compositional and nutritional qualities of fruit are highly variable among states with different climate, soil, and other environmental conditions. Compositional and nutritional data of fresh fruit that reflect Alabama growing conditions is limited. Commercially fully ripened kiwi fruit (Actinidia deliciosa cvs. Fitzgerald and Hayward) were compared for fruit quality (pH, TA, °Brix, °Brix/TA, and soluble sugars), and antioxidant properties; Vitamin C (reduced, oxidized, and total), Vitamin C Equivalent Antioxidant Capacity (VCEAC), ferric reducing antioxidant power (FRAP), DPPH radical scavenging activity, total phenolics, and flavonoids. In general, `Fitzgerald' ranked higher in overall fruit quality and antioxidant properties when compared to `Hayward'.

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Murshidul Hoque*, Husein Ajwa, and Beiquan Mou

Lettuce (Lactuca sativa L.) is an essential salad crop in the American diet. Nitrogen (N), phosphorus (P), and potassium (K) are required for successful lettuce production and can influence lettuce quality. The objective of the study was to evaluate changes in nutritional composition of romaine (`Green Tower') and iceberg (`Sharp Shooter') lettuce in responses to N, P and K fertilization during fall production in Salinas, Calif. Sixteen treatment combinations of fertilizer were selected to provide a range of treatments. N was applied at 0, 112, 225, and 338 kg·ha-1 as ammonium nitrate; P was applied at 0, 112, and 225 kg/ha as super phosphate; and K was applied at 0 and 112 kg·ha-1 as muriate of potash. Nutritional content of fresh tissue of two types of lettuce was analyzed using high performance liquid chromatography (HPLC). Among the parameters analyzed were lutein, beta-carotene, chlorophyll a, and chlorophyll b. Yield was increased with increasing N fertilizer level, but was not affected by P or K application rates. The best post harvest quality, however, was at moderate P application rate. Increasing the N and P rates gradually increased glucose content in lettuce but decreased the shelf life. Significant differences between the two types of lettuce were found in chlorophyll, lutein and beta-carotene content. No significant correlations were found between soil fertilizer application levels and nutritional content of lettuce. However, the ratio of chlorophyll a and b were greater with the increase of fertilizer rate. Nutritional composition including vitamin C will be presented.