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Jorge A. Zegbe-D

To estimate the effect of treatments or cultural practices over fruit dimensions on peach, such as fresh and dry weight and equatorial and polar diameters (FW, DW, ED and PD, respectively), the use of destructive samples are frequent. These variables are generally not included, due to the time-consuming and research costs involved. With the purpose to determine in situ the FW and DW of fruit of seedling peach trees, two cubic regression models (CRM) were fitted with 1241 and 1119 field observations of FW, DW, and ED. To determine DW, fruits were cut off immediately and dried at 70C for 24-h. These measurements were taken during growing season of 1984 and 1985. At 2-week intervals, 12 samples were collected each year. Each sample consisted in harvesting randomly five fruits and around the middle part of trees. The CRM were fitted taking the mean of five fruits. FW and DW were used as dependent variables, while ED as independent variable. To validate both models, during the growing season of 1985, 11 samples (five fruits per sample) were taken again from other trees. The real and predicted values of FW and DW were analyzed by a linear regression model (IRM), to know the grade of adjustment between them. The CRM of both variables had significant fit (r 2 = 0.975 and 0.941 for FW and DW, respectively). In contrast, the highest variation coefficient was observed in DW (29.14%), compared with FW (13.4%). In both cubic models, error mean square was the lowest compared to other models. The linear relation between real and predicted values ha values of r 2 = 0.983 and 0.941 for FW and DW, respectively; while the variation coefficients were 9.59% (FW) and 17.32% (DW). The CRM's can be used in future seedling peach experimental works, to predict fruit weight after full bloom until harvest.

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A. Maaike Wubs, Yun T. Ma, Ep Heuvelink, Lia Hemerik, and Leo F.M. Marcelis

measurements of fruit weight (fresh or dry); with nondestructive measurements, intermediate equations are needed to convert fruit dimensions into fruit fresh or dry weight (e.g., Cuevas et al., 2003 ; De Silva et al., 1997 ; Marcelis, 1992 ; Marcelis and

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P.A. Kiehl, J.H. Lieth, and D.W. Burger

weight; TDW, total dry weight, TFW, total fresh weight. Associate Professor. 1 Currently Instructor, Dept. of Ornamental Horticulture, Foothill College, 12345 El Monte Road, Los Altos Hills, CA 94022-4599. 2 Associate Professor and Extension Specialist

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Michael A. Fidanza, David L. Sanford, David M. Beyer, and David J. Aurentz

a ; Rinker, 2002 ; Wang et al., 1984 ; Wuest et al., 1995 ). Table 3. Analysis of fresh mushroom compost on a dry weight basis. Primary and secondary macronutrients. Average total N content of fresh mushroom compost was 1.12% (wet weight), 6.40 lb

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Fhatuwani N. Mudau, Puffy Soundy, and Elsa S. du Toit

of flowers and flower buds (autumn and winter), stem girth, fresh and dry root weight, fresh and dry stem weight, leaf area [measured by an area meter (LI-3100; LI-COR, Lincoln, Nebr.)], and fresh and dry shoot weights were recorded. At the end of

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Yerko M. Morenol, Anita Nina Miller-Azarenko, and William Potts

Abbreviations: DAFB, days after full bloom, DW, dry weight FW, fresh weight. Graduate Research Assistant. 2 Associate Professor. 3 Statistician. Oregon Agricultural Experiment Station Technical Paper no. 9619. This research was funded by USDA

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Mark Lefsrud, Dean Kopsell, Carl Sams, Jim Wills, and A.J. Both

concentrations z expressed on a fresh weight (FM) basis in the leaf tissues of ‘Melody’ spinach grown with two nitrogen levels and five drying temperatures. Fig. 1. Effect of drying temperature on dry matter of shoot tissue in kale and spinach

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Guo-Liang Jiang, Laban K. Rutto, and Shuxin Ren

traits investigated included plant height (centimeters from the bottom to the top of main stem), fresh biomass of whole plants aboveground (kg·ha −1 ), fresh pod yield (kg·ha −1 ), fresh seed yield (kg·ha −1 ), the weight (grams) of fresh and dried 100

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Jeffrey Adelberg, Maria Delgado, and Jeffrey Tomkins

the sucrose concentration was determined using a refractometer (Atago N10, Atago Instruments Ltd., Tokyo). Plants were blotted dry on paper towels and fresh weight (FW) was recorded. About 5 g tissue/vessel was placed in paper envelopes and dried in a

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Brent Tisserat and Amy Stuff

( Ricinus communis L.) soaked for 48 h in 5, 25, or 50 m m glycerol or a mixture of 10:5, 25:10, and 50:15 m m glycerol:aspartic acid, respectively, resulted in seedlings exhibiting higher fresh and dry weights than seedlings obtained from water